La2NiMnO6 nanoparticles with varying particle size from 27 to 96 nm were synthesis by the sol gel method. Structural characterization was carried out using the x-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Magnetization measurements showed predominantly two magnetic ...
NASA Astrophysics Data System (ADS)
Mesoporous single-crystal Co(3)O(4) was obtained using cage-containing mesoporous silicas, FDU-12 and SBA-16, as templates and characterised by XRD, HRTEM and nitrogen adsorption-desorption while SQUID magnetometry was used to probe the magnetic character. PMID:17563815
PubMed
Epitaxial Fe/Co bilayers were grown on MgO (001) substrates by molecular beam epitaxy, characterized in situ by reflection high-energy electron diffraction and ex situ by x-ray diffraction (XRD), as well as high-resolution transmission electron microscopy (HRTEM). The hexagonal close packed (hcp) structure in two perpendicular domains was identified for ...
Energy Citations Database
Ferromagnetic Fe{sub 3}O{sub 4} nanoparticles with diameter of {approx}27 nm were prepared by a hydrothermal route in the presence of a surfactant, sodium bis(2-ethylhexyl)sulfosuccinate (AOT). The as-synthesized product was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy ...
A luminescent superparamagnetic nanocomposite with an Fe3O4-SiO2-CdS structure is synthesised. Coated with a silica shell, Fe3O4 nanoparticles and CdS quantum dots (QDs) are successfully assembled together. Analysed from the test results of X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy ...
Core/shell nanoparticles consisting of a magnetic core of zinc-substituted manganese ferrite (Mn0.4Zn0.6Fe2O4) and a shell of silica (SiO2) are prepared by a sol gel method using tetraethyl orthosilicate (TEOS) as a precursor material for silica and salts of iron, manganese and zinc as the precursor of the ferrite. Three weight percentages of the shell materials of SiO2 are ...
Structural, magnetic and electronic properties of Co-doped SnO2 nanoparticles sample with the concentration of 3.37% synthesized by the sol-gel-hydrothermal technique are studied in detail with experiments and ab initio calculations. Room temperature ferromagnetism is observed in this dilute magnetic semiconductor. Secondary phases and clusters of cobalt ...
We report the magnetic properties of nanosized Ni0.5Zn0.5Fe2O4 prepared by high-energy ball milling. We have characterized the sample by XRD, HRTEM, SQUID magnetometer and M�ssbauer spectroscopic techniques. Sample exhibits superparamagnetic behaviour at room temperature. At 21 K the ferrimagnetic ordering and collective excitation ...
Previous work on YBa2Cu3Ox (YBCO) thin films deposited by fluorine-based sol-gel synthesis has been extensively reported. To further develop grain-textured YBCO thin films for conductor development, we deposited, via a fluorine-free sol-gel synthesis, YBCO thin films on single crystal substrates of yttrium-stabilized zirconia (YSZ) and LaAlO3 (LAO). Sol-gel-derived films on the YSZ and LAO ...
In-situ synthesis of magnetic nanocomposites with (NiFe2O4/CuO/FeO) crystal phases has been done using a sol-gel method by taking a non-stoichiometric composition of the precursors. The average particle size of the nanocomposites was calculated using X-ray diffraction (XRD) and high resolution tunneling electron microscope (HR-TEM) and ...
We report room temperature ferromagnetism in Ni doped CeO2 nanoparticles using X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM), and dc magnetization measurements. Nanoparticles of Ce(1-x)Ni(x)O2 (0.0 < or = x < or = 0.10) were prepared by using a co-precipitation method. XRD ...
Fe-based nanoparticles were prepared by laser pyrolysis method using a cross-flow reactor in which the CO2 laser radiation orthogonally crosses with the stream of Fe(CO)5, C2H2, and C2H4 gases. The as-synthesised powder was characterised by HRTEM, XRD, M�ssbauer spectroscopy, and low- and high-temperature magnetic measurements. The ...
TiN-Fe films with various iron concentrations were deposited on Si and NaCl single-crystal substrates by direct current reactive magnetron sputtering. The structure and chemical composition of the films were examined by x-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), energy-dispersive x-ray and x-ray photoelectron ...
Nanocrystalline samples of Fe-doped cerium oxide (Ce0.90Fe0.1O2) are prepared by sol-gel method. The precursor materials used for the synthesis are ferric nitrate and cerium nitrate. The as-prepared samples is annealed at different temperatures to obtain the sample with different particle sizes. The crystallographic phases of the nanocrystalline materials have been confirmed by X-ray ...
Carbon nanoribbons and single crystal iron filled multiwall carbon nanotubes (MWCNTs) have been synthesized by simple pyrolysis technique. SEM investigation shows that the material consist mainly carbon nanoribbons and carbon nanotubes (CNTs). X-ray diffraction (XRD), electron energy loss spectroscopy (EELS), electron energy dispersive X-ray (EDX), transmission electron ...
Water-soluble hollow spherical magnetite (Fe3O4) nanocages (ca. 100�nm) with high saturation magnetization are prepared in a one-pot reaction by sol-gel method and subsequent annealing to synthesise the maghemite (?-Fe2O3) nanocages with similar nanostructures. The nanocages have been ...
PubMed Central
Water-soluble hollow spherical magnetite (Fe3O4) nanocages ( ca. 100 nm) with high saturation magnetization are prepared in a one-pot reaction by sol-gel method and subsequent annealing to synthesise the maghemite (?-Fe2O3) nanocages with similar nanostructures. The nanocages have been investigated by powder X-ray diffraction (XRD), transmission electron ...
Fe-doped 6H SiC polycrystalline powders were synthesized by solid-state reaction of high-purity silicon, graphite and iron powder. X-ray powder diffraction (XRD) and high-resolution transmission electron microscope (HRTEM) analysis showed the presence of little Fe3Si as secondary phase. Temperature-dependent magnetization showed two ...
Fe-C) nanoparticles have been successfully synthesized using the laser pyrolysis method and variable nozzle geometries. At large nozzle diameters, XRD and SAED analysis clearly identified distinct {alpha}-Fe and Fe{sub 3}C phases. TEM and HRTEM indicated that these Fe-based nanoparticles have an average grain size of 3.5-10.2 nm. Temperature dependent ...
We have systematically studied the magnetic properties of ferrite nanoparticles with 3, 7, and 11 nm of diameter with very narrow grain size distributions. Samples were prepared by the thermal decomposition of Fe(acac)3 in the presence of surfactants giving nanoparticles covered by oleic acid. High resolution transmission electron microscopy (HRTEM) images ...
Controlled synthesis of magnetic nanoparticles with a well-known size and composition is always a challenge. A soft chemical synthesis was developed to obtain magnetic alloy nanocrystals with a high ability to control composition, size, and polydispersity. Cobalt-platinum alloy nanocrystals were synthesized using a colloidal approach by the liquid-liquid ...
Nanomagnetic nickel ferrite particles were prepared by sol-gel and co-precipitation techniques. Synthesized samples were annealed at 400 �C and 600 �C for two hour to study the variation of properties with temperature. Structural characterization carried out using X-ray Diffraction Technique (XRD), confirmed the formation of polycrystalline single phase nickel ferrite ...
This study describes the synthesis of monodispersed core-shell composites of silica-modified magnetic nanoparticles and conducting polyaniline by self-assembly and graft polymerization. Magnetic ferrite nanoparticles (Fe3O4) were prepared by coprecipitation of Fe+2 and Fe+3 ions in alkaline solution, and then silananized. The silanation of ...
Graphite powders were irradiated by pulsed laser at room temperature and normal pressure and then boiled in perchloric acid. Samples were characterized by high-resolution transmission electron microscopy (HRTEM), electron diffraction pattern (EDP), X-ray diffraction (XRD) pattern, and Raman spectroscopy. The analyses on the HRTEM ...
Monodisperse FePt@MnO nano-hetero-particles with different sizes and morphologies were prepared by a seed-mediated nucleation and growth technique. Both, size and morphology of the individual domains could be controlled by adjustment of the synthetic parameters. As a consequence, different particle constructs, including dimers, dumbbells and flowers, could be obtained by changing the polarity of ...
The present paper reports the complex permittivity, permeability, and microwave absorption properties of core shell type poly (3,4-ethylenedioxy thiophene) (PEDOT) nanocomposite with barium ferrite, synthesized by in situ emulsion polymerization, in the 12.4-18 GHz frequency range. High-resolution transmission electron microscopy (HRTEM) studies reveal the formation of ...
The electrochemical properties of new disordered carbon materials obtained by a gas-phase reaction of LPG (liquid propane gas) have been studied. Pyrolysis of LPG was performed in the temperature range 900 to 1,200 C. The lithium storage mechanism in these disordered carbons has been investigated by the charge-discharge tester, cyclic voltammeter, X-ray diffraction (XRD), ...
Magnetoplumbite-type (M-type) hexagonal strontium ferrite particles were synthesized via sol�gel technique employing ethylene glycol as the gel precursor at two different calcination temperatures (800 and 1000 �C). Structural properties were systematically investigated via X-ray diffraction (XRD), field emission scanning electron microscopy, high resolution transmission ...
The quantitative analysis of structural defects in Ag nanoparticles was addressed in this work. We performed atomic scale structural characterization by a combination of x-ray diffraction (XRD) using the Pair Distribution Function analysis (PDF) and High Resolution Transmission Electron Microscopy (HRTEM). The XRD measurements were ...
Using a novel inductively coupled plasma enhanced chemical vapor deposition (ICP-CVD) with magnetic confinement system, Ti Si N films were prepared on single-crystal silicon wafer substrates by sputtering Ti and Si (5 at.%:1 at.%) alloyed target in argon/nitrogen plasma. High-resolution transmission electron microscopy (HRTEM), X-ray photoelectron ...
Single crystalline Ba6Mn24O48 nanoribbons with diameters ranging from one hundred nanometers to a few hundred nanometers and length up to tens of microns are synthesized via a facile molten salt method. These nanoribbons are characterized by a range of methods including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy ...
In this work, we describe a kinetically controlled crystallization process assisted by an oriented attachment (OA) mechanism based on a nonaqueous sol-gel synthetic method (specifically, the reaction of titanium(iv) chloride (TiCl4) with n-octanol) to prepare re-crystallized anatase TiO2 mesocrystals (single crystal). The kinetics study revealed a multi-step and hierarchical process controlled by ...
In the present study, a facile one-pot synthetic route, utilizing a strong polar organic solvent, N-methyl 2-Pyrrolidone (NMP) is demonstrated to obtain highly monodispersed ferrite nanocrystals. The equimolar mixture of oleic acid, C17H33COOH (R-COOH) and oleylamine, C18H35NH2 (R'-NH2) were used to coat the magnetic nanocrystals. Structural and magnetic ...
Mn-doped ZnO samples with 5%, 20% and 40% nominal Mn concentrations were prepared in the presence of ethyl acetoacetate under solvothermal conditions. UV absorption spectroscopic analysis discloses that chemical modification was achieved by reaction of Zn or Mn precursor with ethyl acetoacetate in ethanol medium. XRD and HRTEM characterizations indicate ...
Macroporous nanocrystalline YFeO3 was prepared by a self-propagating combustion method using yttrium nitrate and iron nitrate as precursors and glycine as a fuel. The phase structure of the product can be selectively controlled to be hexagonal or orthorhombic by simply adjusting the ratio of glycine to nitrate. The samples were characterized by X-ray diffraction (XRD) ...
In order to explore the fundamental properties of one-dimensional nanostructured high-temperature superconductors and enhance their promising applications, a universal and general method for the synthesis of high-quality YBa2Cu3O7-? (YBCO) nanowire arrays is developed, which involves the combination of a novel sol-gel process to lower the crystallization temperature of YBCO, and porous anodic ...
We demonstrated a simple route to simultaneously synthesize PdO and boehmite nanoparticles, and to directly immobilize the former on the latter using an ionic liquid (IL)-assisted one-pot solution method. PdO nanoparticles were directly immobilized on boehmite nanoparticles, and their amount and distribution were controlled by the stoichiometry of the mixture. In particular, ?-alumina nanofibers, ...
The field emissive, electrical, magnetic, and structural characteristics of nickel (Ni) nanowires synthesized using the electrochemical deposition method with an alumina nanoporous template are reported. The synthesis and formation of Ni nanowires were confirmed by XRD, SEM, and HR-TEM experiments. Ferromagnetic hysteresis curves and ...
A characterization study detailing the phase transformations and microstructural nature of the carbon deposited during methane decomposition over red mud has been undertaken. In situ XRD was carried out to study the phase transformation sequences of red mud during the reaction. Scanning electron microscopy, high resolution transmission electron microscopy, thermogravimetric ...
This paper is an overview of research in my group over the past 10 to 15 years. Our work has explored the synthesis, assembly, nanostructure characterization, and optical properties of a wide variety of semiconductor quantum dots in II-VI, III-V, and other systems. Our early work was aimed at applications in photonics and fiber optics but more recently we have worked on biomolecular engineering ...
Magnetic nanoparticles are of considerable interest owing to their potential applications in biotechnology and the magnetic recording industry. Iron oxides have received much attention owing to their oxidative stability and biocompatibility; however, other transition metals and their alloys are also under investigation. Cobalt has one of the largest ...
The substantiated isolation of the antimony subiodide (Sb(3)I) is presented for the first time. It has been prepared using elemental Sb and I in ethanol under ultrasonic irradiation at 323 K. Its composition was characterized using X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray analysis (EDAX). The scanning electron microscopy (SEM) and high-resolution transmission electron ...
In this work, we report the synthesis of ZnS nanospheres with relatively narrow size distribution using polyvinyl pyrrolidone (PVP) as a capping reagent. The nanocrystallite powers were characterized using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), electron diffraction (ED), and UV vis optical absorption spectra. The ...
Carbon aerogels and Cr-, Fe-, Co-, and Ni-containing carbon aerogels were obtained by pyrolysis, at temperatures between 500 and 1,800 C, of the corresponding aerogels prepared by the sol-gel method from polymerization of resorcinol with formaldehyde. All samples were characterized by mercury porosimetry, nitrogen adsorption, X-ray diffraction (XRD), high-resolution ...
We present a systemic study on the structural, thermal and magnetic properties of Zn1?xMnxO nanoparticles synthesized by a combustion method with heavily Mn doping concentrations x=0.05, 0.15 and 0.25. The structural evolutions in relation to the possible variation of the Mn oxidation state and dopant induced tiny Zn2MnO4/Mn2O3 and ZnMnO3/MnO2 impurities, which have not been ...
The occurrence of fine particles of magnetite in soils and sediments may, under favorable climatic and environmental conditions, be the result of iron reduction in pre-existing magnetic phases. Nonetheless, the conditions and pathways leading to magnetite formation, and the connection between the amount and type of magnetite particles (size distribution, shape, etc�) and ...
The alteration of naturally occurring iron oxides and oxyhydroxides, under the influence of varying environmental conditions, including micro-environments and biological activity, is an important research topic because their connection to past climate variations remains to be elucidated. One approach to this subject matter is to perform laboratory experiments using synthetic iron oxides (sensus ...
Onion-like fullerenes (OLFs) were synthesized by arc discharge in benzene using graphite as electrode and ferrocene as catalyst. The effect of ferrocene on the morphologies and structures of the OLFs was investigated by HRTEM and XRD. Results show that ferrocene directly influenced the morphology and yield of OLFs: The degree of graphitization is better. ...
Brannerite MnV2O6 with plate-like shape is successfully synthesized by hydrothermal method. Its crystal structure and morphology are investigated by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), high resolution transmission electron microscopy (HRTEM) and select area electronic diffraction (SAED). The ...
TiO2 nano powders with Mn concentration of 0 at%-12 at% were synthesized by the sol�gel process, and were annealed at 500 �C and 800 �C in air for 2 hrs. X-ray diffraction (XRD) measurements indicate that the Mn-TiO2 nano powders with Mn concentration of 1 at% and 2 at% annealed at 500 and 800 �C are of pure anatase and rutile, respectively. The scanning electron ...
Polypyrrole (PPy)/Fe(3)O(4) magnetic nanocomposite as a novel adsorbent was prepared via in-situ polymerization of pyrrole (Py) monomer using FeCl(3) oxidant in aqueous medium in which Fe(3)O(4) nanoparticles were suspended. The adsorbent was characterized by Attenuated Total Reflectance Fourier transform infrared spectroscope (ATR-FTIR), Brunauer-Emmet-Teller (BET) method, ...
In this study, sub-microsized CoFe2O4 octahedra with a high yield are synthesized via a simple hydrothermal route under mild conditions. The as-prepared products are characterized by conventional techniques of XRD, SEM, TEM, ED and HR-TEM. The results show that the as-synthesized sample exhibits octahedral morphology with a narrow size distribution. The ...
Hybrids of Fe(3)O(4) nanoparticles and surface-modified graphene nanosheets (GNs) were synthesized by a two-step process. First, graphene nanosheets were modified by SOCl(2) and 4-aminophenoxyphthalonitrile to introduce nitrile groups on their surface. Second, the nitrile groups of surface-modified graphene nanosheets were reacted with ferric ions on the surface of Fe(3)O(4) with the help of ...
Iron oxide minerals are the prime candidates for Fe(III) signatures in remotely sensed Martian surface spectra. Magnetic, Mossbauer, and reflectance spectroscopy have been carried out in the laboratory in order to understand the mineralogical nature of Ma...
National Technical Information Service (NTIS)
A detailed characterization of two samples synthesized at 13 GPa and 830 K with heating times of 20 min and 1 h, respectively, was performed using x-ray diffraction (XRD), Raman spectroscopy, and high-resolution transmission electron microscopy (HRTEM). The sample heated for 20 min was amorphous and exhibited a high hardness of 45 GPa, while the second ...
Inverse spinel type structured oxide, LiNiVO{sub 4}, was synthesized by using solid-state method and the crystalline powder was characterized by Rietveld refinement and X-ray photoelectron spectroscopy. Non-stoichiometric lithium nickel vanadate thin films were prepared by physical vapour deposition technique. The amorphous films were characterized by Rutherford back-scattering spectroscopy (RBS), ...
High-resolution transmission electron microscopy (HRTEM) has been used in this work to study the microstructural (structure and microtexture) changes occurring during the high-temperature treatment of the unburned carbon concentrates from coal combustion fly ashes. Emphasis was placed on two aspects: (i) the development of graphitic carbon structures and (ii) the disordered ...
Fourteen illite/smectite (I/S) clays separated from lower Paleozoic K-bentonites have been studied by XRD, XRF, HRTEM, and alkylamonium ion exchange. The samples represent the full range of commonly occurring I/S compositions in diagenetic K-bentonites. Chemical analysis and XRD data show that the increases in the amount of tetrahedral ...
Titania nanoparticles doped with Cr{sup 3+} (2% relative to molar quantity of titania) were prepared and examined by EDS, HRTEM, XRD, and UV-VIS analysis. HRTEM images showed the detailed atomic arrays and vacancy defects of the doped Titania nanocrystals and revealed that the implanted Cr element existed in titania mainly as Cr{sup ...
Silicon carbide (SiC) particles with/without cobalt (Co) powder as catalyst were heated on a carbon (C) boat at temperatures ranging from 1,300 to 1,550�C for 10 min in medium vacuum with low oxygen (O2) flow rate. A large quantity of fiberlike products was found on the SiC particles. The products were observed using a high-resolution scanning electron microscope (HR-SEM) and a high-resolution ...
Molybdenum disulfide (MoS2) is a compound found in nature as molybdenite, natural MoS2 has a hexagonal crystal form. MoS2 is a compound very useful for its properties; it is used as lubricant, catalyst in hydrodesulfuration, in hydrogen fuel storage, etc. Currently, researchers are synthesizing MoS2 with new shapes and MoS2 nanoparticles. In this work MoS2 nanohexagonal plates were synthesized at ...
We report here the structural and magnetic behaviors of nickel-silver (Ni-Ag) and nickel-iron (Ni-Fe) nanoclusters stabilized with polymer (polypyrrole). High resolution transmission electron microscopy (HRTEM) indicates Ni-Ag nanoclusters to stabilize in core-shell configuration while that of Ni-Fe nanoclusters in a mixed type of geometry. Structural ...
In this study, we describe the development of a facile and effective route for the synthesis of Fe(3)O(4)-based T(1) contrast agent, which can be useful for in vivo magnetic resonance (MR) imaging. Citrate-coated Fe(3)O(4) nanoparticles (6 nm) with a narrow size distribution were synthesized by "one-pot green chemistry route" in diethylene glycol (DEG) solvent. The synthesized ...
In this paper, we have first demonstrated a facile and green synthetic approach for preparing superparamagnetic Fe3O4 nanoparticles using ?-D-glucose as the reducing agent and gluconic acid (the oxidative product of glucose) as stabilizer and dispersant. The X-ray powder diffraction (XRD), X-ray photoelectron spectrometry (XPS), and selected area electron diffraction (SAED) ...
High-resolution transmission electron microscopy (HRTEM) observations of mechanically alloyed powders and bulk extruded alloys give experimental evidence of nanosized grains in bismuth telluride-based materials. In this study we combine HRTEM observations and x-ray diffraction (XRD) measurements, of both mechanically alloyed powders ...
Irradiation of thin epilayers of yttrium iron garnet (YIG) was performed at room temperature with 50 MeV 32S, 50 MeV 63Cu and 235 MeV 84Kr ions, for which the energy loss in the targets was mainly due to electronic excitation and ionization. The resulting damage was studied by high-resolution X-ray diffraction (HRXRD) and transmission electron microscopy (HRTEM). In the case ...
... microhardness data, microhardness data, xrd data, room temperatures, xrd, ion beam sputterings, sputterings, debye-waller coefficients, magnetic ...
DTIC Science & Technology
The thermal stability of amorphous LaScO{sub 3} thin films deposited by molecular-beam deposition directly on (001) Si was investigated by high-resolution transmission electron microscopy (HRTEM), transmission infrared absorption spectroscopy (IRAS), and x-ray diffraction (XRD). IRAS indicated that the as-deposited films contained <0.1 A ring of ...
The thermal stability of amorphous LaScO3 thin films deposited by molecular-beam deposition directly on (001) Si was investigated by high-resolution transmission electron microscopy (HRTEM), transmission infrared absorption spectroscopy (IRAS), and x-ray diffraction (XRD). IRAS indicated that the as-deposited films contained <0.1 A? of SiO2 at the ...
We report the synthesis and structural characterization of ferroelectric bismuth vanadate (Bi2VO5.5) (BVO) nanotubes within the nanoporous anodic aluminum oxide (AAO) templates via sol-gel method. The as-prepared BVO nanotubes were characterized by X-ray powder diffraction (XRD), Scanning Electron Microscope (SEM), High-Resolution Transmission Electron Microscope ...
Nanoscale iron particles have gained much attention recently for their potential application in the remediation of a wide variety of common environmental contaminants. Fe0 iron nanoparticles are difficult to synthesize by conventional methods. Here we report room-temperature synthesis of iron-iron oxide core-shell nanoclusters using a new type of source. Oxide shells act as passivation layers ...
ABSTRACT: This work reports the preparation and characterization of silver nanoparticles synthesized through wet chemical solution method and of silver films deposited by dip-coating method. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), field emission transmission electron microscopy (FETEM), high-resolution transmission electron microscopy ...
The authors report the synthesis of three sizes of thioglycerol-capped precipitated ZnS nanocrystallites with relatively narrow size distributions, having average sizes of 1.8, 2.5, and 3.5 nm, respectively. These crystallites were extracted as free-standing powders which remain stable under normal atmospheric conditions and can be redispersed in suitable solvents. The nanocrystallite powders were ...
The synthesis and characterization of ultrafine CuInS2 nanoparticles are described. Ultraviolet irradiation was used to decompose a molecular single source precursor, yielding organic soluble approximately 2 nm sized nanoparticles with a narrow size distribution. UV-vis absorption, 1H and 31P{1H} NMR, and fluorescence spectroscopies and mass spectrometry were used to characterize decomposition of ...
The synthesis and characterization of ultrafine CuInS2 nanoparticles are described. Ultraviolet irradiation was used to decompose a molecular single source precursor, yielding organic soluble {approx}2 nm sized nanoparticles with a narrow size distribution. UV-vis absorption, 1H and 31P(1H) NMR, and fluorescence spectroscopies and mass spectrometry were used to characterize decomposition of the ...
The crystalline structure transformation of five carbon anodes during gasification in air and carbon dioxide was studied using quantitative X-ray diffraction (XRD) analysis and high-resolution transmission electron microscopy (HRTEM). XRD analysis and HRTEM observations confirmed that anodes have a highly ordered ...
Al2O3 thin films are grown by atomic layer deposition on GaAs substrates at 300�C. The structural properties of the Al2O3 thin film and the Al2O3/GaAs interface are characterized using x-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and x-ray photoelectron spectroscopy (XPS). The XRD results show ...
Recent advances in nanomaterial have produced a new class of fluorescence labels by conjugating noble metal with biomolecules. The nanometer size metal conjugates are water soluble, biocompatible and provide important advantage over the fluorescence dyes. In this regard we synthesized silver nanoparticles at the size of 2-4 nm using biological route and studied fluorescence property of these ...
The colossal magnetoresistance (CMR) manganite La0.6Nd0.2Na0.2MnO3 nanowires were synthesized in porous anodic alumina oxide (AAO) membrane via the sol-gel template route. X-ray diffraction (XRD) results of La0.6Nd0.2Na0.2MnO3/AAO composites verified the purity of the perovskite structure of La0.6Nd0.2Na0.2MnO3. Field emission scanning electron microscopy (FE-SEM) confirmed ...
The study of the morphologies of the single walled carbon nanotube (SWCNT), magnetite nanoparticles (MNP), and the composite based on them was carried with combined X-ray diffraction (XRD), Raman spectroscopy (RS), scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy ...
In this work, we present several examples of the synthesis and characterization of bimetallic nanoparticle alloys using the Laser Vaporization Controlled Condensation (LVCC) method. In the first example, the vapor phase synthesis of Au-Ag, Au-Pd, and Au-Pt nanoparticle alloys are presented. The formation of nanoalloys is concluded from the observation of one plasmon absorption band at a wavelength ...
In this study, we report the synthesis of hierarchical chlorine-doped rutile TiO{sub 2} spherical clusters of nanorods photocatalyst on a large scale via a soft interface approach. This catalyst showed much higher photocatalytic activity than the famous commercial titania (Degussa P25) under visible light ({lambda}>420 nm). The resulting sample was characterized by X-ray diffraction ...
A facile approach for the preparation of a novel hybrid material containing graphene and an inorganic semiconducting material, cadmium sulfide quantum dots (CdS QDs), is demonstrated for the first time. First, amino-functionalized CdS QDs were prepared by modifications of the kinetic trapping method. Then, pristine graphite was oxidized and exfoliated to obtain graphene oxide nanosheets (GONS), ...
One-dimensional Mn(2+)-doped CdS nanocrystals were synthesized by the hydrothermal route. The products were characterized by SEM, EDS, XRD, TEM, HRTEM and PL, respectively. The results revealed that dopant Mn2+ completely substitutes Cd2+ in CdS nanocrystals, and the product was of good crystallite. Further more, a complete suppression of the emission from ...
The purpose of this research is to achieve a better understanding to improve materials used as the intrinsic layers of amorphous and microcrystalline silicon-based solar cells. Fundamental structural properties will be investigated on atomic and nano-scales. A powerful combination of techniques will be used: analytical high-resolution transmission electron microscopy (HRTEM), ...
DOE Information Bridge
We report a simple and efficient single-step synthesis of tungsten carbide nanorods and nanoplatelets by direct pyrolysis of a hybrid composite material of 12-tungstophosphoric acid and hexadecyltrimethylammonium bromide in a closed Swagelok cell at 1000 degrees C. The product was characterized by XRD, TGA, SEM, TEM, XPS, and CV. The diameter of the nanorods is 30-50 nm, and ...
The synthesis of nanoparticles silica oxide from rice husk, sugar cane bagasse and coffee husk, by employing vermicompost with annelids ( Eisenia foetida) is reported. The product ( humus) is calcinated and extracted to recover the crystalline nanoparticles. X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy ...
The synthesis of nanoparticles silica oxide from rice husk, sugar cane bagasse and coffee husk, by employing vermicompost with annelids (Eisenia foetida) is reported. The product (humus) is calcinated and extracted to recover the crystalline nanoparticles. X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy ...
Hexagonal and monoclinic NdPO4 nanowires about 5-50nm in diameter and up to several micrometers long were prepared through hydrothermal reaction in 100�C and 220�C, respectively. The products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS), and high-resolution transmission electron microscopy ...
At 850 �C, Zn-doped CdTe nanowires with an average diameter of about 40 nm and lengths up to several tens of micrometers were fabricated by a CVD approach. The nanowires were detected by SEM, XRD, TEM, HRTEM, EDS, SAED, and XPS, where the as-synthesized CdZnTe nanowires have high-quality crystalline structure and grow along the <001> direction and ...
Extracellular synthesis of silver nanoparticles by a brown seaweed, Sargassum wightii is reported in this study. The silver nanoparticles synthesized by this method were characterized by means of UV-Vis spectroscopy, FT-IR, XRD and HR-TEM. Antibacterial studies were carried out using the bacteriae isolated from the infected silkworm. The recorded ...
BaF{sub 2} nanocrystals doped with 5.0 mol% Eu{sup 3+} has been successfully synthesized via a facile, quick and efficient ultrasonic solution route employing the reactions between Ba(NO{sub 3}){sub 2}, Eu(NO{sub 3}){sub 3} and KBF{sub 4} under ambient conditions. The product was characterized via X-ray powder diffraction (XRD), scanning electron micrographs (SEM), ...
The Ag-Ga/poly(methyl methacrylate) nanoparticles were prepared in-situ by emulsion polymerization method under ultrasonic irradiation without any initiators or metal reductant. HRTEM, EDS and XRD experiments were performed to characterize the nanoparticles. The results indicated that the nanocomposite particles possessed core-shell structure with ...
Worm-like nanorods and nanospheres of silver have been synthesized by photochemical decomposition of silver oxalate in water by UV irradiation in the presence of CTAB and PVP, respectively. No external seeds have been employed for the synthesis of Ag nanorods. The synthesized Ag colloids have been characterized by UV-visible spectra, powder XRD, HRTEM, and ...
In this study, sub-microsized CoFe{sub 2}O{sub 4} octahedra with a high yield are synthesized via a simple hydrothermal route under mild conditions. The as-prepared products are characterized by conventional techniques of XRD, SEM, TEM, ED and HR-TEM. The results show that the as-synthesized sample exhibits octahedral morphology with a narrow size ...
... XRD of crystals gave relative proportions of calcite and aragonite present and XRF measured transition metals and elements known to substitute for ...
New pyrroles were synthesized wherein biomolecules such as ?-amino acids, peptides or carbohydrates are attached to position 1 or 3 via suitable linkers. These conjugates were copolymerized with pyrrole by chemical polymerisation alone giving corresponding copolymers or in the presence of magnetic iron oxid nanoparticles resulting in functionalized core-shell-nanoparticles. ...
A soft-chemistry method is used to synthesize zinc ferrite nanoparticles to prepare a magnetic fluid. We investigate here their internal structure by X-ray Absorption Near Edge Spectroscopy (XANES) and X-Ray Diffraction (XRD). A cross analysis of XANES and Rietveld refinement of XRD spectra shows non-equilibrium site occupancy with ...
Carbon supported Au-Pt catalysts with different bimetallic compositions were prepared by water-in-oil (w/o) micro-emulsions. Carbon Vulcan XC-72R was added during the synthesis of particles in order to obtain good dispersion. Structural characterization was performed using XRD (X-ray diffraction) at wide angles, WAXS (wide-angle X-ray scattering) which showed that Pt-Au ...
Nanocrystalline antimony trisulfide (Sb{sub 2}S{sub 3}) was successfully synthesized via microwave irradiation by the reaction of antimony trichloride (SbCl{sub 3}) and thiourea (CS(NH{sub 2}){sub 2}) with PVP as the surfactant. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and high resolution TEM ...
This paper reports a mechanistic study on the formation of colloidal UO2/In2O3 and FePt/In2O3 heterodimer nanocrystals. These dimer nanocrystals were synthesized via the growth of In2O3 as the epitaxial material onto the seed nanocrystals of UO2 or FePt. The resulting dimer nanocrystals were characterized using X-ray powder diffraction (XRD), energy dispersion spectroscopy, ...
Silicon carbide (SiC) nanorods were prepared via reacting silicon nanopowders and multi-walled carbon nanotubes (MWCNTs) for 4h at 1100-1200�C in a molten NaCl-NaF binary salt in Ar atmosphere. The synthesised SiC nanorods were characterised by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), electron energy loss ...
The microstructure of BaTiO3 (BT) nanocrystals was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), selected area electron diffraction (SAED), and (high-resolution) transmission electron microscopy [(HR)TEM]. The BT nanocrystals have a cubic perovskite structure as revealed by XRD and SAED. They were ...
A kind of thermo-sensitive core/shell nanoparticles (Mn-Zn ferrite/poly(N,N'-isopropylacrylamide-co-N-hydroxymethylacrylamide)) has been designed in this work. By using the surface initiated method, a thermoresponsive co-polymer composed of N,N'-isopropylacrylamide (NIPAAm) and N-hydroxymethylacrylamide (HMAAm) was grafted from ferrite core. The nanoparticles obtained were characterized by FT-IR, ...
A route to produce large amounts of nanometer scale graphene ribbons is presented. The process involves the thermal decomposition of ethanol-ferrocene and minute concentrations of thiophene solutions. The material consists of stacked graphene sheets with dimensions of several microns in length, 100-500 nm in width and 10-20 nm in thickness. The morphology and structure of such material have been ...
In-doped ZnO (IZO) nanowires have been synthesized by a thermal evaporation method. The morphology and microstructure of the IZO nanowires have been extensively investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), and high-resolution transmission electron microscopy (HRTEM). The products in general contain several kinds of ...
The synthesis of cerium dioxide nanoparticles using an inverse microemulsion technique and precipitation method was investigated. Cerium hydroxide nanoparticles were synthesized by adding diluted ammonia to n-heptane surfactant cerium nitrate system. The micelle and particle size in the range of 5 12 nm were controlled by varying the molar water to surfactant ratio and analyzed by dynamic light ...
In this paper, we report on the synthesis of ZnO nanowires via templated electrochemical deposition. The deposition was performed in a classical three electrodes electrochemical cell and the samples were mounted as a working electrode. A polycarbonate membrane with random distribution of nanometric pores was used as the working electrode. The morphology analysis and structure characterization of ...
A novel sonochemical method for direct preparation of nanocrystalline antimony selenoiodide (SbSeI) has been established. The SbSeI gel was synthesized using elemental Sb, Se, and I in the presence of ethanol under ultrasonic irradiation (35 kHz, 2W/cm(2)) at 50 degrees C for 2h. The product was characterized by using techniques such as powder X-ray diffraction (XRD), scanning ...
A facile hydrothermal route has been developed for the synthesis of nearly spherical copper nanoparticles, copper nanocubes and ribbon-like network nanostructures. The as-prepared copper nanostructures were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ...
Cubic-CeO2 and -Fe2O3 thin films have been epitaxially grown on yttria-stabilized ZrO2 and -Al2O3 substrates, respectively, by oxygen plasma assisted molecular beam epitaxy (OPA-MBE). The interface structural features between the films and the substrates were characterized by Rutherford backscattering spectrometry (RBS), high resolution transmission electron microscopy ...
Multiwalled carbon nanotube (MWCNT)-fused silica composite powders were synthesized by solgel method and dense bulk composites were successfully fabricated via hot-pressing. This composite was characterized by XRD, HRTEM, and FESEM. MWCNTs in the hot-pressed composites are in their integrity observed by HRTEM. The electrical properties ...
Homogeneous cuprous oxide (Cu{sub 2}O) nanoparticles with size of 8-10nm are deposited on multiwall carbon nanotubes (MWNTs) by a polyol process using Cu(CH{sub 3}COO){sub 2}.H{sub 2}O as a precursor and diethylene glycol as both solvent and reducing agent. The composition of the resulting Cu{sub 2}O/MWNTs composites is confirmed by XRD pattern, XPS spectrum and ...
, HRSEM, HRTEM and XPS. The particles' magnetic properties were studied using a Quantum Design SQUID MPMS2 in the fields of nano-electronics and nano-mechanics. In this lecture, I will review recent theoretical work University, New York, USA Excitation of micro and nanomechanical structures using optical fields
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In the present work is reported the use of the biopolymer chitosan as template for the preparation of magnetite and magnetite/silver core/shell nanoparticles systems, following a two step procedure of magnetite nanoparticles in situ precipitation and subsequent silver ions reduction. The crystalline and morphological characteristics of both magnetite and magnetite/silver core/shell nanoparticles ...
Nanocomposite core-shell particles that consist of a Sn0 core surrounded by a thin layer of tin oxides have been prepared by thermolysis of [(Sn(NMe2)2)2] in anisole that contains small, controlled amounts of water. The particles were characterized by means of electronic microscopies (TEM, HRTEM, SEM), X-ray diffraction (XRD) studies, photoelectron ...
Here we demonstrate the preparation of samarium doped yttrium oxide nanoparticles using samarium chloride as a samarium source by co-precipitation method. The samarium doped yttria nanoparticles are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), selected area electron ...
Nanometer-sized tin, Sn/R, and Sn/Si-R (R = n-C{sub 4}H{sub 9}), core/shell nanoparticles have been prepared by the reaction of SnCl{sub 4} or SiCl{sub 4} with Mg{sub 2}Sn in ethylene glycol dimethyl ether (glyme) and subsequently with n-C{sub 4}H{sub 9}Li. Sn/SiO{sub 2} core/shell nanoparticles are produced from the reaction of Mg{sub 2}Sn with SiCl{sub 4} and subsequent reaction with H{sub ...
The structure of amorphous Se films, in the topological random system, has been studied by the computer-simulation, electron diffraction (ED), and high-resolution transmission electron microscopy (HRTEM). As an example of HRTEM of the cellular random system, our recent investigation on Ba-ferrites is reviewed beforehand. In HRTEM ...
Many applications of high temperature superconductors, HTS, require the presence of lattice defects in the material structure to suppress the motion of magnetic vortices and enhance the critical current density, J{sub c}. The microstructure of Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8{minus}{delta}} (Tl-2212) thin films which have extended defects induced by high energy Au and Cu ...
For Au-ceria catalysts prepared by deposition-precipitation method, the catalytic performance of water gas shift reaction was studied with different La loadings. In the complete doping range, ceria retains with its cubic fluorite structures. XRD, HRTEM and UV-Vis-DRS, studies showed that La doping can improve the activity of Au-ceria catalyst by ...
A simple ultrasound-assisted cracking process was applied to prepare high-crystallinity MoS2 nanorods using MoS2 micron particles as raw materials. The products were characterized by various techniques, including XRD, SEM, TEM and HRTEM. Systematic studies showed that acid treatment and ultrasound irradiation are both prerequisites for the preparation of ...
Mesoporous SnO2 was prepared by a high temperature microwave assisted process using a low cost polymeric surfactant, poly(ethylene glycol). The obtained material has been characterized by several sophisticated techniques such as XRD, nitrogen adsorption, HRTEM, UV-Vis DRS, HRSEM and photoluminescence. The characterization results reveal that the obtained ...
ZnO/Ag nanocomposites with different silver concentration are successfully synthesized by solvothermal method. The characterization of the as- synthesized samples is done using XRD, UV-visible spectroscopy and HRTEM and the results indicate that the composites consist of silver nanoparticles attached to the ZnO nanoparticles. The optical non-linearity in ...
Thin films of La2Zr2O7 (LZO) are highly regarded as possible buffer layers in the coated conductor configuration. This report describes a new synthesis for thin crystalline LZO films, based on a largely water-based solution, mainly containing metal acetates, acetic acid and an organic amine-base: triethanolamine. Initially, a thin layer of amorphous material is deposited on the textured Ni-5 at%W ...
The umbrella-like ZnO nanostructures have been prepared by the morphological tailoring in the aqueous solution at 95 deg. C in the addition of heterogeneous seeds such as MnO{sub 2} and CdS nanoparticles. The morphology and structure of as-synthesized umbrella-like ZnO nanostructures have been characterized by transmission electron microscopy (TEM), high-resolution transmission electron microscope ...
A sonochemical method was used to synthesize carbon nanotube (CNT) in the presence of dichlorobenzene and ZnCl2 under ambient conditions. Structural characterizations were carried out using Raman spectroscopy, X-ray diffraction (XRD) and X-Ray photoelectron spectroscopy (XPS) which confirmed successful formation of CNT. Thermogravimetric analysis shows reduction in amorphous ...
We report the synthesis of bamboo-like BN nanotubes by annealing amorphous BN powders at 1100 [degree sign]C in an Ar atmosphere. The amorphous powders were obtained after ball-milling h-BN for times longer than 60 h. The materials were characterized using high-resolution transmission electron microscopy (HRTEM), electron energy loss spectroscopy (EELS), elemental mapping, ...
Highly ordered ZrO2 nanotube (NT) arrays were fabricated by anodization in organic electrolyte containing NH4F. A facile sequential-chemical bath deposition technique was used to prepare CdS quantum dots (QDs) in the pores of ZrO2 NTs. XRD and HRTEM results confirmed the formation of single-phase wurtzite CdS nanoparticles with uniform size around 10 nm. ...
A simple and efficient microemulsion-based technique, which used the new Tx-100/cyclohexanol/ H2O system, was developed to synthesize SrCrO4 nanowire based nanostructures, including nanowire bundles and flower-like structures at different temperature. X-ray powder diffraction (XRD), field emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM) ...
This work presents results of HRTEM and XRD studies on microstructure of ceria-based mixed oxides subjected to high-temperature heat treatment in air. Nano-sized (4-5 nm) crystallites of Ce(0.5)Ln(0.5)O(1.75) oxides (Ln = Yb, Lu) with narrow size distribution were prepared by a microemulsion method (W/O). Presence of an intermediate cubic phase, with ...
Oxides containing polyanions such as XO4^2- (X = S, Mo, P and W) as lithium insertion hosts are promising cathode materials due to their high thermal stability. However, the larger separation of the transition metal ions can be expected to reduce the electron mobility. As observed in LiFePO4, this can be overcome either by coating the cathode materials with carbon or by decreasing the particle ...
PbS hollow nanospheres with diameters of 80-250 nm have been synthesized by a surfactant-assisted sonochemical route. The nanostructures were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), (high-resolution) transmission electron microscopy [(HR)TEM], and scanning electron microscopy (SEM) images. Structural ...
Pure and uniform hexagonal-phase ZnS nanorods with quantum confinement effect were synthesized by solvothermal decomposition of an air-stable, easily obtained single-source molecular precursor (zinc diethyldithiocarbamate, Zn-(DDTC){sub 2}) in hydrazine hydrate aqueous solutions at 150-200 deg. C, and characterized by powder X-ray diffraction (XRD), X-ray photoelectron ...
Cluster-like cadmium silicate (CdSiO3) nanowire arrays on Si substrate have been synthesized via a self-catalytic growth using a modified vapor-phase evaporation method. XRD and HRTEM analyses indicated that the CdSiO3 nanowire had a monoclinic single-crystal structure. The growth mechanism of the cluster-like nanowire array is proposed as ...
A singularity flower-like ZnO nanostructure was prepared on a large scale through a very simple solution method at room temperature and under ambient pressure in a very short time. The flower-like ZnO nanostructures were self-assembled by thin and uniform nanosheets, with a thickness of around 5 nm. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), ...
Flower-like Ni nanoparticles in diameter of 200 approximately 250 nm were synthesized by a mild chemical solution method. They were composed of smaller single-crystal Ni grains with an average diameter of approximately 15 nm. XRD, EDS and HRTEM results show that these particles were mixed uniformly with iron oxide single crystals, which serve as seeds for ...
Room temperature chemical synthesis of PbSe thin films was carried out from aqueous ammoniacal solution using Pb(CH3COO)2 as Pb2+ and Na2SeSO3 as Se2- ion sources. The films were characterized by a various techniques including, X-ray diffraction (XRD), energy dispersive X-ray analysis (EDAX), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high ...
Nanoclusters of PbS embedded in polymer matrices have recently been shown to have interesting optical properties with the capability of tuning the effective band gap over a wide spectral range. The results of a systematic investigation of the preparation and characterization of size-tuned PbS nanocrystals stabilized in the polymer nanotemplate of Nafion and their size-dependent physical properties ...
Monodispersed and well-aligned samples of TiO(2) nanosquares were synthesized in large quantities in the presence of tetramethylammonium hydroxide (TMAOH) for the first time. These nanosquares were single crystals characterized by slightly truncated shape bounded by {101} facets. XRD, AFM, FT-IR, Raman scattering, TEM and HRTEM were employed to ...
Few-layer N-doped graphene nanosheets (GNSs) were prepared by a DC arc discharge under a nitrogen atmosphere of high temperature. HRTEM characterization shows the typical morphology of the several layer GNSs and some GNSs stacking together in the form of terrace. The typically rotational stacking faults can be observed in the GNSs. The Raman spectrum shows the characteristic ...
Rhodium(0) nanoparticles stabilized by tert-butylammonium octanoate were prepared reproducibly from the reduction of rhodium(II) octanoate with tert-butylamine-borane in toluene at room temperature and characterized by ICP-OES, TEM, HRTEM, STEM, EDX, XRD, XPS, FTIR, UV-vis, (11)B, (13)C and (1)H NMR spectroscopy and elemental analysis. These new rhodium(0) ...
EuF{sub 3} and TbF{sub 3} were successfully coated on the multi-walled carbon nanotubes (MWNTs) via the intermediate of noncovalent hydrophobic interactions of the MWNTs surface with sodium dodecyl sulfate (SDS). They were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy ...
Ultralong ZnO nanowires were successfully prepared on a large scale by a microwave-assisted aqueous route without using any surfactant or template at relatively low temperature of 120�C. The obtained nanowires were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron ...
SnO2 zigzag nanobelts were successfully Sb-doped by a simple vapor deposition method. Field emission scanning electron microscope (FESEM), high resolution transmission electron microscope (HRTEM), and X-ray diffraction (XRD) were used to characterize these Sb-doped nanobelts. The Sb doping in SnO2 nanobelts was confirmed by Energy Dispersive X-ray spectrum ...
Multi-walled carbon nanotubes (MWCNTs) were coated with a nano-sized ?-alumina polycrystalline layer by hydrothermal crystallization under autoclave conditions followed by manipulative calcination. These nanocomposites were characterized for their microstructure and composition by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), transmission electron ...
The mesoporous NiO-SDC was synthesized using a cationic surfactant (cetyl-trimethylammonium bromide; CTAB) for obtaining wide triple-phase boundary (TPB) in solid oxide fuel cells (SOFCs). The microstructure of mesoporous NiO-SDC was characterized by XRD, SEM, BET, and HRTEM and the results showed that the mesoporous NiO-SDC with 6.3 nm pores could be ...
Single crystals of PbS in the form pyramids with a high proportion of high energy {331} faces are obtained by the use of a novel reaction technique at the interface of water and toluene. The pyramids spontaneously form a monolayer spread across the entire water-toluene interface. The influence of deposition parameters such as temperature, solution concentration, reaction time on the nature and ...
The influence of the substitution of methanol in place of ethanol during the ultrasonic production of antimony sulfoiodide (SbSI) nanowires is presented. The new technology is faster and more efficient at temperatures greater than 314 K. The products were characterized by using techniques such as powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy ...
GaN nanowires (NWS) were synthesized at different temperatures by ammoniating Ga2O3/Co films deposited on Si (111) substrate. X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscope (HRTEM), Fourier transformed infrared spectra (FTIR) and photoluminence (PL) spectra were used to characterize the ...
Ag2V4O11 nanobelt has been synthesized through a hydrothermal process and its surface segregation leading to the in-situ controllable synthesis of Ag nanoparticles under different irradiation conditions is investigated. The resulted materials are characterized by XRD, TEM, HRTEM, and SAED measurements. It is found that well-distributed Ag nanoparticles ...
The thermoelectric (TE) performance of Bi0.5Sb1.5Te3 polycrystalline alloys has been improved by a simple hot-forging process. No obvious texture was observed in the x-ray diffraction (XRD) patterns of the hot-forged samples. Transport property measurements indicated that the hot-forged samples possessed extremely low thermal conductivities. A maximum ZT value of �1.1 at ...
Spindle-like hollow nanostructures of zinc sulfide (ZnS) have been successfully synthesized by hydrothermal process using a simple surfactant emulsion template. The morphologies of ZnS nanostructures were characterized by transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and field-emission scanning electron microscopy (FE-SEM). It ...
GaN nanowires doped with Dy have been fabricated on Si (111) substrate through ammoniating Ga2O3 films doped with rare earth phosphor. The samples are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscope (XPS), scanning electron microscope (SEM), high-resolution transmission electron microscope (HRTEM) and photoluminescence (PL). The ...
Addition of the organogermanium compound, Me{sub 3}GeS(CH{sub 2}){sub 3}Si(OMe){sub 3}, to a modified, conventional sol-gel formulation gives a silica xerogel doped with this molecular species. Subsequent thermal treatment of this molecularly doped xerogel under oxidizing then reducing conditions affords nanoclusters of Ge highly dispersed throughout the bulk of the xerogel matrix. Under ...
The reaction of MoO3 and S at temperatures higher than 300 degrees C in an argon atmosphere provides a convenient and effective method for the synthesis of MoS2 nanocrystalline substances. MoS2 nanotubes and fullerene-like nanoparticles have been obtained by the reaction at 850 degrees C under well-controlled conditions. The influences of reaction temperature and duration were carefully ...
Single-phase layered titanium carbide (TiC) was successfully synthesized by reacting carbon nanotubes (CNTs) and titanium dioxide (TiO2) under a high direct current (DC) pulse. Single-phase TiC layer fabrication is confirmed as the transformation of multi-layered graphene from MWCNTs. Therefore its thickness and width is almost identical to those of transformed graphene layers. This is the first ...
We demonstrate bulk synthesis of highly crystal Cd-doped ZnO nanowires by using (Cd + Zn) powders at 600 deg. C. These mass ultra-fine ZnO nanowires with about 0%, 1%, 4% and 8% Cd so obtained have been characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive ...
Basic bismuth (III) nitrate (BBN)/BiVO(4) composites were prepared by a coprecipitation method. A variety of techniques including X-ray powder diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), diffuse reflectance spectroscopy (DRS), N(2) adsorption, and X-ray photoelectron spectroscopy (XPS) ...
Various reductants and surfactants were used to investigate their effects on the structure of Bi2Te3 nanopowders prepared via hydrothermal synthesis at 150�C for 24 h. X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM) were applied to analyze the phase distributions, ...
We utilized a vapor-liquid-solid growth technique to synthesize indium oxide, gallium oxide, and tin oxide nanowires using chemical vapor transport with gold nanoparticles as the catalyst. Using identical growth parameters we were able to synthesize single crystal nanowires typically 40-100 nm diameter and more than 10-100 microns long. The products were characterized by means of ...
Our study described a synthesis of thiol-capped high-luminescent (quantum yield as high as 80%) CdTe quantum dots (QDs) with a facile method in aqueous phase. The fluorescence of the as-prepared CdTe QDs could be tuned from 500 nm to 650 nm. More importantly, after beta-actin conjugation, the CdTe QDs were successfully conjugated with live cells to observe their configurations, demonstrating their ...
Noble-metal nanoparticles and their Langmuir films have attracted remarkable research interest due to their unique properties and potential applications in catalysis, hydrogen storage materials, and optical, magnetic and electronic devices. The properties of nanoparticles are affected not only by the size, but also by the shape. In this dissertation, highly crystalline ...
In this work, highly crystalline ?-MnO2 nanodisks are synthesized via a simple microemulsion process by using polyvinylpyrrolidone (PVP) as a capping layer. Detailed information about the morphology, such as size, shape and crystallinity, was investigated by using x-ray diffraction, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) as well as high ...
ferrite phase and no diffraction of other impurities is observed in the patterns. Compared with the powder analysis Fig. 1 shows XRD patterns of the auto-combusted powder and samples annealed at different verification Fig. 4 shows XRD patterns of powders when auto-combusted ferrite was annealed at 600 1C for 1 h
In order to develop a better understanding of p-doping in SnO2 nanoparticles, a gel-sol method of synthesis is employed to systematically examine the influence of reaction and growth conditions such as pH, dopant concentration, and calcinations temperature. The extent of Li doping in nanoparticles is characterized using nuclear reaction analysis (NRA) and the nanostructure with high-resolution ...
The present work involves the synthesis of molybdenum disulfide (MoS2) nanoparticles by annealing the precursor obtained from simple reflux method. XRD, FESEM and HRTEM confirmed the formation of 2H-MoS2 with ball shaped particles, where some of them possess coalesced dumbbell morphology. The reinforcement of polysulphide modified epoxy resin (PSER) by ...
Mesoporous ceria-zirconia solid solutions were prepared by a novel salt-assisted combustion process using ethylene glycol as a fuel and nitrate as an oxidant. The effects of various operating conditions such as the fuel-to-oxidant ratio and the nature and amount of added salt on the characteristics of the products were investigated by X-ray diffraction (XRD) and nitrogen ...
Present study reports a green chemistry approach for the biosynthesis of Au, Ag, Au-Ag alloy and Au core-Ag shell nanoparticles using the aqueous extract and dried powder of Anacardium occidentale leaf. The effects of quantity of extract/powder, temperature and pH on the formation of nanoparticles are studied. The nanoparticles are characterized using UV-vis and FTIR spectroscopies, ...
In this paper, we employed a facile hydrothermal route to successfully synthesize nanosized nickel phosphide particles with controlled phases via selecting different surfactants at different temperatures and times. The phases of the as-obtained products were determined by X-ray powder diffraction (XRD) patterns and Rietveld refinement of XRD data. The ...
A superacid mesostructured catalyst was directly synthesized by adding sulfuric acid to mesoporous zirconia-silica synthesis mixtures, and was characterized by HRTEM, XRD, UV-Vis, nitrogen sorption, NH{sub 3}-TPD, and Pyridine-FTIR. The XRD patterns and electron diffraction micrographs of the calcined samples showed the ordered ...
The microstructures of lithiated synthetic graphite and carbon black were studied by high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) analysis. Information about the crystal structure of carbon containing various Li compositions can provide useful insights to our understanding of the Li storage mechanism in carbonaceous ...
In the present work, amorphous manganese oxide nanomaterials have been synthesized by a common hydrothermal method based on the redox reaction between MnO4(-) and Fe(2+) under an acidic condition. The synthesized MnO2 samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), transmission ...
This study reports on the mechanothermal synthesis of multiwalled carbon nanotube (MWCNTs) from elemental graphite powder. Initially, high ultra-active graphite powder can be obtained by mechanical milling under argon atmosphere. Finally, the mechanical activation product is heat-treated at 1350 degrees C for 2-4 h under argon gas flow. After heat-treatment, active graphite powders were ...
This study reports on the mechanothermal synthesis of multiwalled carbon nanotube (MWCNTs) from elemental graphite powder. Initially, high ultra-active graphite powder can be obtained by mechanical milling under argon atmosphere. Finally, the mechanical activation product is heat-treated at 1350�C for 2�4�h under argon gas flow. After heat-treatment, active graphite powders were successfully ...
Aqueous dispersions of highly stable, redispersible silver nanoparticles (Ag NPs) were synthesized using gamma radiolysis with gum acacia as a protecting agent. The formation of nanosized silver was confirmed by its characteristic surface plasmon absorption peak at around 405 nm in UV-vis spectra. The size of the silver nanoparticles can be tuned by controlling the radiation dose, ratio of gum ...
Facile, surfactant free synthetic strategy for bifunctionalized hybrid silica spheres (HS) with structural ordering is presented. HS was prepared by casting and drying of stable siloxane solution from hydrolytic co-condensation of 3-aminopropyltriethoxysilane (AS) and vinyltriethoxysilane (VS) with AS:VS mole ratio of 1:3 in ethanol/water mixture. Spheres of size in the range of 250 nm to 2.5 ...
Al-doped ZnO (AZO) transparent conducting films were successfully prepared on glass substrates by RF magnetron sputtering method under different substrate temperatures. The microstructural, electrical and optical properties of AZO films were investigated in a wide temperature range from room temperature up to 350 �C by X-ray Diffraction (XRD), Field-Emission Scanning ...
Schwertmannite, an iron oxyhydroxide sulfate nanomineral, plays a significant role in the geochemistry of acid mine drainage (AMD) as a metastable phase with respect to goethite and by retaining toxic metals, e.g. arsenic [1]. Schwertmannite�s characteristic morphology is needles 100-300 nm long and only 5-10 nm in diameter extending from a dense aggregate. The poorly-and nano-crystalline nature ...
Thin films of La{sub 2}Zr{sub 2}O{sub 7} (LZO) are highly regarded as possible buffer layers in the coated conductor configuration. This report describes a new synthesis for thin crystalline LZO films, based on a largely water-based solution, mainly containing metal acetates, acetic acid and an organic amine-base: triethanolamine. Initially, a thin layer of amorphous material is deposited on the ...
A non-cadmium and water-soluble Mn-doped ZnO(x)S(1-x) QDs was synthesized with denatured bovine serum albumin (dBSA) as stabilizer under nitrogen atmosphere, and the as-prepared products were characterized by X-ray powder diffraction (XRD), UV-vis absorption spectroscopy, fluorescence (FL) emission spectroscopy, high resolution transmission electronmicroscopy ...
Herein, we report the synthesis of aqueous CdTe/CdSe type-II core-shell quantum dots (QDs) in which 3-mercaptopropionic acid is used as the capping agent. The CdTe QDs and CdTe/CdSe core-shell QDs are characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), steady-state absorption, and emission spectroscopy. A ...
The structure of a series of new ionic conductors based in lanthanum molybdate (La{sub 2}Mo{sub 2}O{sub 9}) has been investigated using transmission electron microscopy (TEM), high-resolution X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The superstructure 2a{sub c}x3a{sub c}x4a{sub c} of the low temperature {alpha}-polymorph relative to the ...
Multilayer samples of the type (YSZ|Sc2O3) � n with layer thicknesses between 8 nm (n=100) and 250 nm (n=5) were prepared on (0001) sapphire substrates by pulsed laser deposition (PLD). The samples were characterised using X-ray diffraction (XRD), scanning electron microscopy (HRSEM) and transmission electron microscopy (TEM/HRTEM, SAED (selected-area ...
A novel ultrasonic-modified MnO(x)/TiO(2) catalyst was prepared and compared with two different kinds of MnO(x)/TiO(2) catalysts in the process of low-temperature selective catalytic reduction of NO with NH(3). The physicochemical properties of the catalysts were studied by using various characterization techniques, such as Brunauer-Emmett-Teller (BET) surface measurement, X-ray diffraction ...
Postalkoxysilylation with diethoxydimethylsilane has been carried out on the zeolitic lamellar precursors of various topologies such as MWW, FER, CDO and MCM-47 aiming to construct new crystalline structures with expanded pore apertures between the layers. The silylation process and the crystalline and pore structures of the resulting materials have been investigated with the techniques of ...
Gd2O3:Eu3+ and Gd2Ti2O7:Eu3+ films 10 nm in thickness were individually coated onto silica spheres (particle size of 150-170 nm) using the sol-gel method. The synthesized materials were addressed as Gd2O3:Eu3+@SiO2 and Gd2Ti2O7:Eu3+@SiO2 phosphors. An x-ray powder diffractometer (XRD), field emission scanning electron microscope (FE-SEM), high-resolution transmission electron ...
Hydrogenated nanocrystalline silicon carbide were grown at various deposition temperatures T{sub d} from 200 to 600 deg. C by means of reactive magnetron sputtering in a plasma of 80% H{sub 2} and 20% Ar mixture. A detailed investigation of the structural, compositional, phase nature, and morphology was carried out by complementary sophisticated techniques, such as Fourier transform infrared ...
Hydrogenated nanocrystalline silicon carbide were grown at various deposition temperatures Td from 200 to 600 �C by means of reactive magnetron sputtering in a plasma of 80% H2 and 20% Ar mixture. A detailed investigation of the structural, compositional, phase nature, and morphology was carried out by complementary sophisticated techniques, such as Fourier transform infrared spectroscopy, x-ray ...
Highly monodisperse Cu- and Ag-based bimetallic noble metal nanocrystals (BNMNs) with diameter 2-7nm have been synthesized. The synthesis employs a successive reduction process by using inorganic metal salts as precursors at a low temperature (~110 �C). HRTEM, XPS and XRD analytical techniques were applied for the structural analysis of BNMNs. Catalytic ...
Monodisperse CeF3:Tb3+ nanocrystals have been synthesized from mixed solvents-thermal synthesis under mild condition. The products have been characterized by High Resolution Transmission electron microscopy (HRTEM), X-ray diffraction (XRD), UV-visible Diffuse Reflectance spectra and luminescent spectra, respectively. Besides, different solvents ratio and ...
A novel polychromic phosphor with core-shell heteronanostructure has been prepared to improve the chromatic index of phosphors. As for the first example, Y2O3:Eu3+@SiO2@YVO4:Eu3+, its synthetic route, structure and optical properties are presented in this paper. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high resolution transmission electron ...
A novel polychromic phosphor with core-shell heteronanostructure has been prepared to improve the chromatic index of phosphors. As for the first example, Y(2)O(3):Eu(3+)@SiO(2)@YVO(4):Eu(3+), its synthetic route, structure and optical properties are presented in this paper. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high resolution ...
In the present study, Fe2O3 nanopowder has been grown by Ultrasonic mist chemical vapor deposition (UM-CVD), which is a promising method for large area deposition at low temperatures taking in to account of its simplicity, inexpensiveness and safety. Room temperature XRD results revealed prominent hematite phase with intense (104) reflection and was also in agreement with the ...
We present theoretical and experimental results on the bonding and structural characteristics of AlN:Ag thin film nanocomposites obtained by means of density functional theory (DFT) computations, high resolution transmission electron microscopy (HRTEM) observations, Auger electron spectroscopy (AES), and x-ray diffraction (XRD) measurements. From the ...
A simple route of combined sol-gel process with surfactant-assisted templating technique was successfully employed for the first time to synthesize nanocrystalline mesoporous Dy(2)O(3) with narrow monomodal pore size distribution under mild conditions. The nanocrystalline Dy(2)O(3) with monomodal mesoporous characteristic was ultimately achieved by controlling the hydrolysis and condensation steps ...
