Synthesis and optical properties of self-assembled flower-like CdS architectures by mixed solvothermal process

AbstractSelf-assembled CdS architectures with flower-like structures have been synthesized by a mixed solvothermal method using ethylene glycol and oleic acid as the mixed solvent at 160°C for 12 h. The results of X-ray diffraction (XRD) patterns, field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) images indicate that the product exists as the hexagonal wurtzite phase and conatins of larger numbers of flower-like CdS architectures with diameters of 1.8–3 μm. The selected-area electron diffraction (SAED) pattern and the high resolution transmission electron microscope (HRTEM) image reveal that the grain has better crystallinity. The optical properties of flower-like CdS architectures were also investigated by ultraviolet-visable (UV-vis) and photoluminescence spectroscopy at room temperature. A strong peak at 490 nm is shown in the UV-vis absorption, while an emission at 486 nm and another strong emission at 712 nm are shown in the PL spectrum.

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Phase Formation in a Wedged Au-Ag-Cu Multilayered Structure

MRS Proceedings ◽

10.1557/proc-311-39 ◽

1993 ◽

Vol 311 ◽

Cited By ~ 1

Author(s):

I. Goldfarb ◽

E. Zolotoyabko ◽

D. Shechtman

Keyword(s):

Electron Microscopy ◽

Phase Formation ◽

Multilayered Structure ◽

Heat Treatments ◽

X Ray Diffraction ◽

X Ray ◽

Selected Area Electron Diffraction ◽

Transmission Electron ◽

Scanning Transmission ◽

Xrd Patterns

ABSTRACTAn advanced method for investigation of multicomponent systems is proposed. Thin wedged-shape films of pure components are subsequently deposited to form a multilayered structure with continuously-varying composition as a function of sample location, providing a large number of differently composed samples in one deposition run. Each sample is then subjected to various heat treatments, and phase content as well as the microstructure formed is under investigation.In this study an Au-Ag-Cu multilayered structure was sputtered at a room temperature onto 55 Formvar-coated Mo grids. The satellite-like X-Ray Diffraction (XRD) patterns of these samples revealed the formation of an artificial composition-modulated ternary superlattice, complete destruction of which was observed during heat treatments, where phase formation according to the ternary Au-Ag-Cu phase diagram took place.Several aspects of phase formation were analyzed using XRD, Electron Probe for Micro- Analysis (EPMA) in Scanning Electron Microscopy (SEM), and Scanning Transmission Electron Microscopy (STEM) combined with Selected Area Electron Diffraction (SAED), Digital X-Ray Mapping (DXM), Secondary Electron Mapping and EPMA methods.

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Synthesis and Photoluminescence Properties of Novel SnO2 Zigzag Nanoribbons

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.97-101.4213 ◽

2010 ◽

Vol 97-101 ◽

pp. 4213-4216

Author(s):

Jian Xiong Liu ◽

Zheng Yu Wu ◽

Guo Wen Meng ◽

Zhao Lin Zhan

Keyword(s):

Electron Microscopy ◽

Room Temperature ◽

Vapour Deposition ◽

Chemical Vapour ◽

Photoluminescence Properties ◽

X Ray Diffraction ◽

X Ray ◽

Selected Area Electron Diffraction ◽

Transmission Electron ◽

Ceramic Boat

Novel single-crystalline SnO2 zigzag nanoribbons have been successfully synthesized by chemical vapour deposition. Sn powder in a ceramic boat covered with Si plates was heated at 1100°C in a flowing argon atmosphere to get deposits on a Si wafers. The main part of deposits is SnO2 zigzag nanoribbons. They were characterized by means of X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM) and selected-area electron diffraction (SAED). SEM observations reveal that the SnO2 zigzag nanoribbons are almost uniform, with lengths near to several hundred micrometers and have a good periodically tuned microstructure as the same zigzag angle and growth directions. Possible growth mechanism of these zigzag nanoribbons was discussed. A room temperature PL spectrum of the zigzag nanoribbons shows three peaks at 373nm, 421nm and 477nm.The novel zigzag microstructures will provide a new candidate for potential application.

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CONTROLLED SYNTHESIS OF THE ZnWO4 NANOSTRUCTURE AND STUDY OF THEIR STRUCTURAL AND OPTICAL PROPERTIES

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863512500026 ◽

2012 ◽

Vol 21 (01) ◽

pp. 1250002 ◽

Cited By ~ 2

Author(s):

NGUYEN MANH HUNG ◽

LAM THI HANG ◽

NGUYEN VAN KHANH ◽

DU THI XUAN THAO ◽

NGUYEN VAN MINH

Keyword(s):

Electron Microscopy ◽

Grain Size ◽

Optical Properties ◽

Reaction Time ◽

X Ray Diffraction ◽

Structural And Optical Properties ◽

Calcination Time ◽

Transmission Electron ◽

Pure Phase ◽

Size And Morphology

We investigate the effects of calcination time and concentration of solution on the structure, as well as optical properties in ZnWO4 nanopowder prepared by hydrothermal method. The prepared powder were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman scattering, optical absorption and photoluminescent spectroscopy (PL). It is shown that the grain size and morphology of ZnWO4 nanopowder can be controlled by adjusting the reaction time as well as the concentration of the solution. The resultant sample is a pure phase of ZnWO4 without any impurities. The result showed that the optical property of ZnWO4 nanopowders depend on their grain size. The optical band gap becomes narrower as the reaction time or concentration of solution is increased. The improved PL properties of the ZnWO4 crystallites can be obtained with the optimal concentration of the solution.

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On the destruction of kaolinite and gibbsite by phenylphosphonic, phenylphosphinic and phenylarsonic acids: evidence for the formation of new Al compounds

Clay Minerals ◽

10.1180/0009855043940142 ◽

2004 ◽

Vol 39 (4) ◽

pp. 391-404 ◽

Cited By ~ 8

Author(s):

J. E. F. C. Gardolinski ◽

G. Lagaly ◽

M. Czank

Keyword(s):

Electron Microscopy ◽

Thermal Analysis ◽

Transmission Electron Microscopy ◽

Fourier Transform ◽

Linear Chain ◽

X Ray Diffraction ◽

Phenylphosphonic Acid ◽

X Ray ◽

Selected Area Electron Diffraction ◽

Transmission Electron

AbstractKaolinite and synthetic γ-Al(OH)3 (gibbsite or hydrargillite) were reacted with phenylphosphonic, phenylphosphinic and 2-nitrophenol-4-arsonic acids. The products were studied by powder X-ray diffraction, transmission electron microscopy/selected area electron diffraction/ energy dispersive X-ray/Fourier transform infrared and simultaneous thermogravimetric/differential thermal analysis. The acids were not intercalated but, instead, easily destroyed the structure of the minerals. Lamellar Al phenylphosphonate and aluminium phenylphosphinate and phenylarsonate with polymeric linear-chain structures were formed from kaolinite. The reaction between gibbsite and the same acids yielded almost identical products. No evidence of formation of grafted kaolinite derivatives after the reaction with phenylphosphonic acid was found.

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Fabrication of TiO2Nanotanks Embedded in a Nanoporous Alumina Template

Journal of Nanomaterials ◽

10.1155/2015/452148 ◽

2015 ◽

Vol 2015 ◽

pp. 1-7 ◽

Cited By ~ 3

Author(s):

C. Massard ◽

S. Pairis ◽

V. Raspal ◽

Y. Sibaud ◽

K. O. Awitor

Keyword(s):

Electron Microscopy ◽

Sol Gel ◽

Thermal Treatments ◽

X Ray Diffraction ◽

Alumina Template ◽

Nanoporous Alumina ◽

Selected Area Electron Diffraction ◽

Transmission Electron ◽

Vis Spectroscopy ◽

Sol Gel Process

The feasibility of surface nanopatterning with TiO2nanotanks embedded in a nanoporous alumina template was investigated. Self-assembled anodized aluminium oxide (AAO) template, in conjunction with sol gel process, was used to fabricate this nanocomposite object. Through hydrolysis and condensation of the titanium alkoxide, an inorganic TiO2gel was moulded within the nanopore cavities of the alumina template. The nanocomposite object underwent two thermal treatments to stabilize and crystallize the TiO2. The morphology of the nanocomposite object was characterized by Field Emission Scanning Electron Microscopy (FESEM). The TiO2nanotanks obtained have cylindrical shapes and are approximately 69 nm in diameter with a tank-to-tank distance of 26 nm. X-ray diffraction analyses performed by Transmission Electron Microscopy (TEM) with selected area electron diffraction (SAED) were used to investigate the TiO2structure. The optical properties were studied using UV-Vis spectroscopy.

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Anomalous Ferromagnetism and Electron Microscopy Characterization of High-Quality Neodymium Oxychlorides Nanocrystals

NANO ◽

10.1142/s179329201650034x ◽

2016 ◽

Vol 11 (03) ◽

pp. 1650034

Author(s):

Xinliang Zheng ◽

Juan Feng ◽

Jiarui Zhang ◽

Hongna Xing ◽

Jiming Zheng ◽

...

Keyword(s):

Electron Microscopy ◽

Diluted Magnetic Semiconductors ◽

Magnetic Semiconductors ◽

X Ray Diffraction ◽

High Quality ◽

Selected Area Electron Diffraction ◽

Transmission Electron ◽

Diluted Magnetic ◽

Microscopy Characterization

High-quality neodymium oxychlorides nanocrystals with cubic shape were synthesized by a nonhydrolytic thermolysis route. The morphology and crystal structure of the neodymium oxychlorides nanocubes were characterized by transmission electron microscopy at the nanoscale. Transmission electron microscope (TEM) image shows that the neodymium oxychlorides nanocrystals are nearly monodispersed with cube-like shape. X-ray diffraction (XRD) and selected area electron diffraction (SAED) patterns of numerous neodymium oxychlorides nanocubes suggest a pure crystal phase with tetragonal PbFCl matlockite structure. HRTEM image of individual neodymium oxychlorides nanocubes indicate that each nanocubes have a single-crystalline nature with high quality. Unlike the anti-ferromagnetism of the bulk, the neodymium oxychlorides nanocubes show clearly anomalous ferromagnetic characteristic at room temperature. This finding provides a new platform for the exploration of diluted magnetic semiconductors, rare earth-based nanomaterials and so on.

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Optical Properties of Nanostructured Mesoporous Semiconductor Films

MRS Proceedings ◽

10.1557/proc-822-s5.6 ◽

2004 ◽

Vol 822 ◽

Author(s):

Iris Nandhakumar ◽

Timothy Gabriel ◽

Xiahong Li ◽

George S. Attard ◽

Matthew Markham ◽

...

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Optical Properties ◽

Liquid Crystal ◽

Reflectance Spectroscopy ◽

Semiconductor Films ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Liquid Crystal Templating

AbstractDirect liquid crystal templating from non-ionic polyoxyethylene surfactants has been utilised to produce well-defined birefringent films of nanostructured cadmium telluride with mesoporous architectures of extended spatial periodicities. The template mixtures and films were characterised by X-ray diffraction, transmission electron microscopy and polarising optical microscopy to ascertain the presence of a regular nanostructure. UV-VIS reflectance spectroscopy was employed to investigate the films' optical properties.

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Hydrothermal Synthesis, Characterization, and Optical Properties of Ce Doped Bi2MoO6Nanoplates

Journal of Nanomaterials ◽

10.1155/2014/934165 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7 ◽

Cited By ~ 5

Author(s):

Anukorn Phuruangrat ◽

Nuengruethai Ekthammathat ◽

Budsabong Kuntalue ◽

Phattranit Dumrongrojthanath ◽

Somchai Thongtem ◽

...

Keyword(s):

Electron Microscopy ◽

Optical Properties ◽

Photoelectron Spectroscopy ◽

Hydrothermal Reaction ◽

Growth Direction ◽

X Ray ◽

Selected Area Electron Diffraction ◽

Transmission Electron ◽

Uv Visible ◽

Bending Modes

Undoped and Ce doped Bi2MoO6samples were synthesized by hydrothermal reaction at 180°C for 20 h. Phase, morphology, atomic vibration, and optical properties were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectrophotometry, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and UV-visible spectroscopy. In this research, the products were orthorhombic Bi2MoO6nanoplates with the growth direction along the [0b0], including the asymmetric and symmetric stretching and bending modes of Bi–O and Mo–O. Undoped and Ce doped Bi2MoO6samples show a strong absorption in the UV region.

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PLD Grown 3C-SiC Thin Films on Si: Morphology and Structure

Materials Science Forum ◽

10.4028/www.scientific.net/msf.821-823.213 ◽

2015 ◽

Vol 821-823 ◽

pp. 213-216

Author(s):

S.M. Ryndya ◽

N.I. Kargin ◽

A.S. Gusev ◽

E.P. Pavlova

Keyword(s):

Electron Microscopy ◽

Thin Films ◽

Rutherford Backscattering Spectrometry ◽

X Ray Diffraction ◽

Force Microscopy ◽

Selected Area Electron Diffraction ◽

Atomic Force ◽

Transmission Electron ◽

Influence Of Substrate ◽

Composition Structure

Silicon carbide thin films were obtained on Si (100) and (111) substrates by means of vacuum laser ablation of α-SiC ceramic target. The influence of substrate temperature on composition, structure and surface morphology of experimental samples was examined using Rutherford backscattering spectrometry (RBS), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), conventional and high-resolution transmission electron microscopy (TEM/HRTEM), atomic force microscopy (AFM), selected area electron diffraction (SAED) and X-ray diffraction (XRD) methods.

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Hydrothermal Synthesis and Characterization of Single-Crystalline -Fe2O3Nanocubes

Journal of Nanomaterials ◽

10.1155/2011/159259 ◽

2011 ◽

Vol 2011 ◽

pp. 1-5 ◽

Cited By ~ 26

Author(s):

Wenqing Qin ◽

Congren Yang ◽

Ran Yi ◽

Guanhua Gao

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Infrared Spectrometry ◽

X Ray Diffraction ◽

Single Crystalline ◽

Selected Area Electron Diffraction ◽

Transmission Electron ◽

Alkaline Agent ◽

One Step

Single-crystalline - nanocubes were successfully obtained in large quantities through a facile one-step hydrothermal synthetic route under mild conditions. In this synthetic system, aqueous iron (III) nitrate () served as iron source and triethylamine served as precipitant and alkaline agent. By prolonging reaction time from 1 h to 24 h, the evolution process of -, from nanorhombohedra to nanohexahedron, and finally nanocube, was observed. The products were characterized by Powder X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), High-resolution Transmission Electron Microscopy (HRTEM), Selected-Area Electron Diffraction (SAED), and Fourier Transform Infrared Spectrometry (FTIR). The possible formation mechanism was discussed on basis of the experimental results.

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