Synthesis and Characterization of MoO2 Nanoplates Prepared by Thermal Evaporation of MoO3 and S Powders

2016 ◽  
Vol 697 ◽  
pp. 3-6
Author(s):  
Han Qing Li ◽  
Zhi Jian Peng ◽  
Jing Wen Qian ◽  
Zhen Guang Shen ◽  
Xiu Li Fu
Keyword(s):  
Electron Microscopy ◽  
Large Scale ◽  
Thermal Evaporation ◽  
Silicon Substrates ◽  
X Ray Diffraction ◽  
Super Capacitor ◽  
Transmission Electron ◽  
Composition And Structure ◽  
Battery Electrode

MoO2 has been widely used in many fields such as catalyst, gas-senor, super capacitor and Li-ion battery electrode. In this paper, MoO2 nanoplates were synthesized in high density and large scale on silicon substrates via simple thermal evaporation of MoO3 and S powders at 950 °C in a tube furnace. The morphology, composition and structure of the nanoplates were characterized by scanning electron microscopy, X-ray diffraction and transmission electron microscopy. The results indicate that the as-synthesized nanoplates are of well crystalline structure, and the thickness of these nanoplates is in the range of 100-300 nm. The growth mechanism of the nanoparticles was proposed as a vapor-solid process.

Sn-Catalyzed Growth of MgO Nanowires

2007 ◽  
Vol 7 (12) ◽  
pp. 4434-4438 ◽  
Author(s):  
Hyoun Woo Kim ◽  
Seung Hyun Shim ◽  
Jong Woo Lee
Keyword(s):  
Electron Microscopy ◽  
Thermal Evaporation ◽  
Light Emission ◽  
X Ray Diffraction ◽  
Vapor Liquid Solid ◽  
X Ray ◽  
Transmission Electron ◽  
Fabrication And Characterization ◽  
Visible Light Emission

We reported the fabrication and characterization of MgO nanowires, which were grown by thermal evaporation of the mixture of MgB2 and Sn powders at 800 °C through a vapor-liquid-solid (VLS) process. We characterized as-synthesized MgO nanowires using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Sn nanoparticles were located at the tips of the nanowires, serving as catalyst for the growth of MgO nanowires. The produced nanowires were of cubic MgO structures with diameters in the range of 10–170 nm. The PL measurement with a Gaussian fitting exhibited visible light emission bands centered at 403, 576, and 720 nm.

scholarly journals Synthesis and Characterization of Single-Crystalline SnO2Nanowires

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Dezhou Wei ◽  
Yanbai Shen ◽  
Mingyang Li ◽  
Wengang Liu ◽  
Shuling Gao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Ambient Pressure ◽  
Silicon Substrates ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Peak Sensitivity ◽  
The Fourier Transform

Tin oxide (SnO2) nanowires were synthesized on oxidized silicon substrates by thermal evaporation of tin grains at 900°C in Ar flow at ambient pressure. Structural characterization using X-ray diffraction and transmission electron microscopy shows that SnO2nanowires have a single crystal tetragonal structure. Scanning electron microscopy observation demonstrates that SnO2nanowires are 30–200 nm in diameter and several tens of micrometers in length. The surface vibration mode resulting from the nanosize effect at 565.1 cm−1was found from the Fourier transform infrared spectrum. The formation of SnO2nanowires follows a vapour-solid (VS) growth mechanism. The gas sensing measurements indicate that SnO2nanowire gas sensor obtains peak sensitivity at a low operating temperature of 150°C and shows reversible response to H2gas (100–1000 ppm) at an operating temperature of RT-300°C.

Synthesis and Characterization of In-Doped SnO2 (ITO) Nanowires

2007 ◽  
Vol 121-123 ◽  
pp. 209-214 ◽  
Author(s):  
Zai Yin Huang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Large Scale ◽  
Thermal Evaporation ◽  
Critical Factor ◽  
Argon Atmosphere ◽  
Synthesis And Characterization ◽  
Transmission Electron ◽  
Scanning Electron

Large-scale synthesis of In-doped SnO2 (ITO) nanowires was achieved by direct thermal evaporation of a mixture of Sn and In powders at 900°C in an Argon atmosphere. Scanning electron microscopy and transmission electron microscopy observations show that ITO nanowires have diameter ranging from 20 to 100 nm and lengths up to several tens of micrometers. By altered the reaction temperature, we find that the temperature of the reaction is the critical factor for the morphologies and sizes of the ITO nanowires.

Growth and Characterization of Ga2O3 Nanoribbons and Nanosheets

2006 ◽  
Vol 517 ◽  
pp. 53-56
Author(s):  
Hyoun Woo Kim
Keyword(s):  
Electron Microscopy ◽  
Gallium Oxide ◽  
Thermal Evaporation ◽  
Thermal Evaporation Technique ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Zno Powders ◽  
Evaporation Technique

We have studied on the use of a GaN powders for growing gallium oxide (Ga2O3) nanoribbons and nanosheets by the thermal evaporation technique. We used x-ray diffraction, scanning electron microscopy, and transmission electron microscopy to characterize the samples. The results showed that the produced Ga2O3 nanomaterials had single crystalline monoclinic structures. The proportion of wider nanoribbons or nanosheets to nanoribbons increased by increasing the growth temperature and by employing the mixture of GaN and ZnO powders.

Synthesis and Characterization of WO3/S Core/Shell Nanoparticles by Thermal Evaporation

2014 ◽  
Vol 602-603 ◽  
pp. 51-54 ◽  
Author(s):  
Jing Wen Qian ◽  
Zhi Jian Peng ◽  
Dian Zhong Wu ◽  
Xiu Li Fu
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Large Scale ◽  
Thermal Evaporation ◽  
Nano Particles ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Transmission Electron ◽  
Composition And Structure ◽  
Core Shell Nanoparticles

WO3 has been widely applied in many fields such as electrochromic window, photocatalyst, and gas-senor. In this paper, WO3/S core/shell nanoparticles were synthesized in high density and large scale on silicon substrates via simple thermal evaporation of WO3 and S powders at 950 °C in a tube furnace. The morphology, composition and structure of the nanoparticles were characterized by scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, and energy dispersive X-ray spectroscopy. The results indicate that the nano-particles have a uniform morphology with a diameter in the range of 150-250 nm and well crystalline structure. The growth mechanism of the nanoparticles was also proposed.

Low Temperature Large Scale CVD Synthesis of Nano Onion-Like Fullerenes

2012 ◽  
Vol 490-495 ◽  
pp. 3211-3214 ◽  
Author(s):  
Lei Shan Chen ◽  
Cun Jing Wang
Keyword(s):  
Electron Microscopy ◽  
Low Temperature ◽  
Aluminum Hydroxide ◽  
Large Scale ◽  
Iron Catalyst ◽  
Chemical Vapor ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Naoh Solution ◽  
Synthesis Reactions

Synthesis reactions were carried out by chemical vapor deposition using iron catalyst supported on aluminum hydroxide at 400 °C and 420 °C, in the presence of argon as carrier gas and acetylene as carbon source. The aluminum hydroxide support was separated by refluxing the samples in 40% NaOH solution for 2 h and 36% HCl solution for 24 h, respectively. The samples were characterized by field-emission scanning electron microscopy, energy dispersive spectroscopy, high-resolution transmission electron microscopy and X-ray diffraction. The results show that carbon nanotubes were the main products at 420 °C, while large scale high purity nano onion-like fullerenes encapsulating Fe3C, with almost uniform sizes ranging from 10-50 nm, were obtained at the low temperature of 400 °C.

Detonation Synthesis of Nano-Size Materials

1995 ◽  
Vol 418 ◽  
Author(s):  
J. Forbes ◽  
J. Davis ◽  
C. Wong
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Nucleation And Growth ◽  
Detonation Synthesis ◽  
X Ray Diffraction ◽  
Crystalline Materials ◽  
X Ray ◽  
Transmission Electron ◽  
Nano Size

AbstractThe detonation of explosives typically creates 100's of kbar pressures and 1000's K temperatures. These pressures and temperatures last for only a fraction of a microsecond as the products expand. Nucleation and growth of crystalline materials can occur under these conditions. Recovery of these materials is difficult but can occur in some circumstances. This paper describes the detonation synthesis facility, recovery of nano-size diamond, and plans to synthesize other nano-size materials by modifying the chemical composition of explosive compounds. The characterization of nano-size diamonds by transmission electron microscopy and electron diffraction, X-ray diffraction and Raman spectroscopy will also be reported.

Hydrothermal Synthesis and Characterization of BiFeO3 Polyhedral Crystallites

2012 ◽  
Vol 174-177 ◽  
pp. 508-511
Author(s):  
Lin Lin Yang ◽  
Yong Gang Wang ◽  
Yu Jiang Wang ◽  
Xiao Feng Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

BiFeO3 polyhedrons had been successfully synthesized via a hydrothermal method. The as-prepared products were characterized by power X-ray diffraction (XRD) pattern, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The possible mechanisms for the formation of BiFeO3 polyhedrons were discussed. Though comparison experiments, it was found that the kind of precursor played a key role on the morphology control of BiFeO3 crystals.

Control of Morphology and Growth Direction of Gallium Nitride Nanostructures

2003 ◽  
Vol 789 ◽  
Author(s):  
Seung Yong Bae ◽  
Hee Won Seo ◽  
Jeunghee Park
Keyword(s):  
Electron Microscopy ◽  
Gallium Nitride ◽  
Large Scale ◽  
Chemical Vapor ◽  
Growth Direction ◽  
Chemical Vapor Deposition Method ◽  
X Ray Diffraction ◽  
Oxide Mixture ◽  
Temperature Range ◽  
Transmission Electron

ABSTRACTVarious shaped single-crystalline gallium nitride (GaN) nanostructures were produced by chemical vapor deposition method in the temperature range of 900–1200 °C. Scanning electron microscopy, transmission electron microscopy, electron diffraction, x-ray diffraction, electron energy loss spectroscopy, Raman spectroscopy, and photoluminescence were used to investigate the structural and optical properties of the GaN nanostructures. We controlled the GaN nanostructures by the catalyst and temperature. The cylindrical and triangular shaped nanowires were synthesized using iron and gold nanoparticles as catalysts, respectively, in the temperature range of 900 – 1000 °C. We synthesized the nanobelts, nanosaws, and porous nanowires using gallium source/ boron oxide mixture. When the temperature of source was 1100 °C, the nanobelts having a triangle tip were grown. At the temperature higher up to 1200 °C the nanosaws and porous nanowires were formed with a large scale. The cylindrical nanowires have random growth direction, while the triangular nanowires have uniform growth direction [010]. The growth direction of the nanobelts is perpendicular to the [010]. Interestingly, the nanosaws and porous nanowires exhibit the same growth direction [011]. The shift of Raman, XRD, and PL bands from those of bulk was correlated with the strains of the GaN nanostructures.

scholarly journals Preparation and Characterization of Polyhydroxybutyrate/Polycaprolactone Nanocomposites

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Cha Ping Liau ◽  
Mansor Bin Ahmad ◽  
Kamyar Shameli ◽  
Wan Md Zin Wan Yunus ◽  
Nor Azowa Ibrahim ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Basal Spacing ◽  
Cooh Group ◽  
Physical Interaction ◽  
X Ray Diffraction ◽  
Ion Exchange Reaction ◽  
Transmission Electron ◽  
Matrix Enhancement ◽  
Double Hydroxide

Polyhydroxybutyrate (PHB)/polycaprolactone (PCL)/stearate Mg-Al layered double hydroxide (LDH) nanocomposites were prepared via solution casting intercalation method. Coprecipitation method was used to prepare the anionic clay Mg-Al LDH from nitrate salt solution. Modification of nitrate anions by stearate anions between the LDH layers via ion exchange reaction. FTIR spectra showed the presence of carboxylic acid (COOH) group which indicates that stearate anions were successfully intercalated into the Mg-Al LDH. The formation of nanocomposites only involves physical interaction as there are no new functional groups or new bonding formed. X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicated that the mixtures of nanocomposites are intercalated and exfoliated types. XRD results showed increasing of basal spacing from 8.66 to 32.97 Å in modified stearate Mg-Al LDH, and TEM results revealed that the stearate Mg-Al LDH layers are homogeneously distributed in the PHB/PCL polymer blends matrix. Enhancement in 300% elongation at break and 66% tensile strength in the presence of 1.0 wt % of the stearate Mg-Al LDH as compare with PHB/PCL blends. Scanning electron microscopy (SEM) proved that clay improves compatibility between polymer matrix and the best ratio 80PHB/20PCL/1stearate Mg-Al LDH surface is well dispersed and stretched before it breaks.

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