Single-molecule precursor-based approaches to cobalt sulphide nanostructures

2010 ◽  
Vol 368 (1927) ◽  
pp. 4249-4260 ◽  
Author(s):  
Karthik Ramasamy ◽  
Weerakanya Maneerprakorn ◽  
Mohammad A. Malik ◽  
Paul O'Brien
Keyword(s):  
Electron Microscopy ◽  
Single Molecule ◽  
Size Range ◽  
Hexagonal Phase ◽  
Cobalt Complexes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Cobalt Sulphide ◽  
Microscopy Images

Cobalt complexes of 1,1,5,5-tetramethyl-2,4-dithiobiuret, [Co{N(SCNMe 2 ) 2 } 3 ] ( 1 ), and 1,1,5,5-tetraisopropyl-2-thiobiuret, [Co{N(SOCN i Pr 2 ) 2 } 2 ] ( 2 ), have been synthesized and characterized. Both complexes were used as single-molecule precursors for the preparation of cobalt sulphide nanoparticles by thermolysis in hexadecylamine, octadecylamine or oleylamine. The powder X-ray diffraction pattern of as-prepared nanoparticles showed the hexagonal phase of Co 1− x S from complex 1 and mixtures of cubic and hexagonal Co 4 S 3 from complex 2 . Transmission electron microscopy images of material prepared from complex 1 showed spherical and trigonally shaped particles in the size range of 10–15 nm; whereas spheres, rods, trigonal prisms and pentagonally and hexagonally faceted crystallites were observed from complex 2 . This observation is the first of the Co 4 S 3 phase in a nanodispersed form.

Hydrothermal Synthesis of Hexagonal Phase Zn1-XMnxS (x = 0–0.05) Nanorods Using Single-Source Precursors

2010 ◽  
Vol 663-665 ◽  
pp. 100-103
Author(s):  
Zhen Ni Du ◽  
Yong Cai Zhang ◽  
Zhi You Xu ◽  
Ming Zhang
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Transmission Electron Microscopy ◽  
Hydrothermal Synthesis ◽  
Diffuse Reflectance ◽  
Hexagonal Phase ◽  
Single Source ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

The synthesis of hexagonal phase Zn1-xMnxS (x = 0–0.05) nanorods was achieved by hydrothermal treatment of zinc manganese diethyldithiocarbamates (Zn1-xMnx-(DDTC)2, x=0–0.05) in 40 mass % hydrate hydrazine aqueous solution at 180 °C for 12 h. The structure, composition and optical property of the obtained products were characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, transmission electron microscopy and UV-vis diffuse reflectance spectra.

Characterization of Nanostructured Nickel Aluminate Formation during Mechano-Chemical Recycling of Spent NiO/Al2O3 Catalyst

2011 ◽  
Vol 364 ◽  
pp. 186-190
Author(s):  
Karim Nazemi Mohammad ◽  
Saeed Sheibani ◽  
Fereshteh Rashchi ◽  
Victor Gonzalez De La Cruz ◽  
Alfonso Caballero Martínez
Keyword(s):  
Electron Microscopy ◽  
Size Range ◽  
Spherical Shape ◽  
Research Use ◽  
Chemical Recycling ◽  
X Ray Diffraction ◽  
Nickel Aluminate ◽  
X Ray ◽  
Transmission Electron

In this research, use of mechanical alloying method, as a new and effective route for the recycling of spent NiO/Al2O3catalyst to nanostructured nickel aluminate spinel was investigated. Samples were characterized using different techniques such as X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). It was found that the formation of NiAl2O4was started between 15 to 20 hours of milling and completed after 60 hours. The final particles had relatively spherical shape with the size range of 5-50 nm.

SYNTHESIS OF HIGH QUALITY CRYSTALLINE C-N FILMS ON SILICON

1996 ◽  
Vol 10 (12) ◽  
pp. 567-571 ◽  
Author(s):  
YAN CHEN ◽  
E.G. WANG ◽  
FENG CHEN ◽  
LIPING GUO
Keyword(s):  
Electron Microscopy ◽  
Vapor Deposition ◽  
Interfacial Layer ◽  
Chemical Vapor ◽  
X Ray Diffraction ◽  
High Quality ◽  
X Ray ◽  
Transmission Electron ◽  
Hot Filament ◽  
Microscopy Images

High quality crystalline C–N films have been synthesized via hot filament chemical vapor deposition using a gas mixture of nitrogen and methane. Scanning electron microscopy images show that a high density of crystalline clusters has been achieved. The clusters are composed of small columnar crystals (20–200 nm across) with hexagonal facets. Energy dispersive X ray analysis indicates a relative nitrogen:carbon composition of 1.30–2.5. X ray diffraction results indicate the films composed of β- and α- C 3 N 4 phases. Together with transmission electron microscopy analyses, we suggest that an interfacial layer C 3−x Si x N 4 is formed between the silicon substrate and the crystalline carbonnitride films.

Solvothermal Synthesis of Mn-Doped CdS Nanorods Using Single-Source Molecular Precursors

2011 ◽  
Vol 284-286 ◽  
pp. 667-670
Author(s):  
Zhen Ni Du ◽  
Zhi You Xu ◽  
Yong Cai Zhang ◽  
Ming Zhang
Keyword(s):  
Electron Microscopy ◽  
Solvothermal Synthesis ◽  
Hexagonal Phase ◽  
Single Source ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molecular Precursors ◽  
Cds Nanorods ◽  
Transmission Electron ◽  
Mn Doped

The synthesis of hexagonal phase Mn-doped CdS (Cd1-xMnxS) nanorods was achieved by solvothermal treatment of a class of easily obtained, air-stable single-source molecular precursors (cadmium manganese diethyldithiocarbamates, Cd1-xMnx-(DDTC)2) in ethylenediamine at 180 °C for 12 h. The structures and compositions of the as-synthesized products were characterized by X-ray diffraction, energy dispersive X-ray spectroscopy and transmission electron microscopy.

Nanocrystalline Co82Ni18 Alloy: Synthesis and Magnetic Properties

2012 ◽  
Vol 585 ◽  
pp. 100-104
Author(s):  
Sudhakar Panday ◽  
B.S. Sunder Daniel ◽  
P. Jeevanandam
Keyword(s):  
Electron Microscopy ◽  
Nanocrystalline Alloy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Cobalt Nickel ◽  
Alloy Particles ◽  
Transmission Electron ◽  
Fcc Phase ◽  
Microscopy Images

Nanocrystalline Co82Ni18 alloy was synthesized by polyol reduction of cobalt-nickel hydroxide precursor. X-ray diffraction results indicated the formation of fcc phase alloy and the crystallite size was found to be about 19 nm. Scanning electron microscopy and transmission electron microscopy images showed the morphology of particles close to spheres and stoichiometry of the precursor and the alloy was obtained by the energy dispersive X-ray analysis. Selected area electron diffraction pattern indicated the polycrystalline nature of the alloy particles. The saturation magnetization of the nanocrystalline alloy was about 107 (emu/g) at room temperature and the M-H measurements at 300 K and 5 K indicated that the nanocrystalline alloy exhibits close to superparamagetic behaviour.

Synthesis of CuInS2 Microspheres using In2S3 Microspheres as Templates

2009 ◽  
Vol 62 (12) ◽  
pp. 1690 ◽  
Author(s):  
Ming Ge ◽  
Changsheng Guo ◽  
Lu Liu ◽  
Baoquan Zhang ◽  
Zhen Zhou
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Building Blocks ◽  
Solvothermal Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Cu Ions ◽  
Microscopy Images ◽  
Scanning Electron

CuInS2 microspheres have been prepared via a solvothermal route employing synthetic In2S3 microspheres as templates. X-ray diffraction analysis reveals that CuInS2 crystals assembled from In2S3 microsphere building blocks are tetragonal phase. Field emission scanning electron microscopy and transmission electron microscopy images show that the prepared CuInS2 microspheres are constructed by nanosheets. The evolution of crystal structure could be attributed to Cu+ ions inserted into the In2S3 microsphere templates, such that some In3+ ions were replaced and tetragonal CuInS2 crystals were formed during the solvothermal process.

A High Resolution Study of G.P. Zones in Aluminum - 4.2 at % Silver

1982 ◽  
Vol 40 ◽  
pp. 722-723 ◽  
Author(s):  
R. Gronsky
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Computer Simulations ◽  
Structural Characteristics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Resolution Study

The phenomenon of clustering in Al-Ag alloys has been extensively studied since the early work of Guinierl, wherein the pre-precipitation state was characterized as an assembly of spherical, ordered, silver-rich G.P. zones. Subsequent x-ray and TEM investigations yielded results in general agreement with this model. However, serious discrepancies were later revealed by the detailed x-ray diffraction - based computer simulations of Gragg and Cohen, i.e., the silver-rich clusters were instead octahedral in shape and fully disordered, atleast below 170°C. The object of the present investigation is to examine directly the structural characteristics of G.P. zones in Al-Ag by high resolution transmission electron microscopy.

Identification of calcium oxalate crystals in dried or fixed tobacco leaf

1984 ◽  
Vol 42 ◽  
pp. 288-289
Author(s):  
Vicki L. Baliga ◽  
Mary Ellen Counts
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Calcium Oxalate ◽  
Growth And Development ◽  
Polarized Light ◽  
Calcium Oxalate Crystals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Calcium is an important element in the growth and development of plants and one form of calcium is calcium oxalate. Calcium oxalate has been found in leaf seed, stem material plant tissue culture, fungi and lichen using one or more of the following methods—polarized light microscopy (PLM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray diffraction.Two methods are presented here for qualitatively estimating calcium oxalate in dried or fixed tobacco (Nicotiana) leaf from different stalk positions using PLM. SEM, coupled with energy dispersive x-ray spectrometry (EDS), and powder x-ray diffraction were used to verify that the crystals observed in the dried leaf with PLM were calcium oxalate.

The Effect of the Microstructure of Diffusion Barriers on the Palladium Activation for Electroless Copper Deposition

2002 ◽  
Vol 716 ◽  
Author(s):  
Seok Woo Hong ◽  
Yong Sun Lee ◽  
Ki-Chul Park ◽  
Jong-Wan Park
Keyword(s):  
Electron Microscopy ◽  
Diffusion Barriers ◽  
Copper Deposition ◽  
X Ray Diffraction ◽  
Plan View ◽  
X Ray ◽  
Transmission Electron ◽  
Electroless Copper ◽  
Sheet Resistance Measurement ◽  
Scanning Electron

AbstractThe effect of microstructure of dc magnetron sputtered TiN and TaN diffusion barriers on the palladium activation for autocatalytic electroless copper deposition has been investigated by using X-ray diffraction, sheet resistance measurement, field emission scanning electron microscopy (FE-SEM) and plan view transmission electron microscopy (TEM). The density of palladium nuclei on TaN diffusion barrier increases as the grain size of TaN films decreases, which was caused by increasing nitrogen content in TaN films. Plan view TEM results of TiN and TaN diffusiton barriers showed that palladium nuclei formed mainly on the grain boundaries of the diffusion barriers.

Palladium Nanowire Thin Films via Template Growth

2003 ◽  
Vol 775 ◽  
Author(s):  
Donghai Wang ◽  
David T. Johnson ◽  
Byron F. McCaughey ◽  
J. Eric Hampsey ◽  
Jibao He ◽  
...  
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Thin Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Conductive Substrate ◽  
Palladium Nanowires ◽  
Efficient Route ◽  
Silica Thin Film

AbstractPalladium nanowires have been electrodeposited into mesoporous silica thin film templates. Palladium continually grows and fills silica mesopores starting from a bottom conductive substrate, providing a ready and efficient route to fabricate a macroscopic palladium nanowire thin films for potentially use in fuel cells, electrodes, sensors, and other applications. X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicate it is possible to create different nanowire morphology such as bundles and swirling mesostructure based on the template pore structure.

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