Synthesis and Characterization of Nanocrystalline ZnO Powders by a Novel Combustion Synthesis Method

2010 ◽  
Vol 152-153 ◽  
pp. 674-678 ◽  
Author(s):  
Bing Wang ◽  
Li Dan Tang ◽  
Jian Zhong Wang
Keyword(s):  
Crystal Structure ◽  
Combustion Synthesis ◽  
Synthesis Method ◽  
Synthesis And Characterization ◽  
Particle Sizes ◽  
Hexagonal Crystal Structure ◽  
Hexagonal Crystal ◽  
Zno Powders ◽  
Scherrer Formula

Nanocrystalline ZnO powders have been synthesized by a novel combustion synthesis method using glycine and urea as mixed fuels and zinc nitrates as oxidant. The as-synthesized ZnO powders are characterized by DSC, XRD and SEM. Results show that the as-synthesized ZnO powders show well crystalline with hexagonal crystal structure and purity without any other impurities and the particle sizes are about 50~70nm calculated by the Scherrer formula.

Characterization of Zn0.96Al0.02Ga0.02O Thermoelectric Material

2013 ◽  
Vol 802 ◽  
pp. 227-231
Author(s):  
Panida Pilasuta ◽  
Pennapa Muthitamongkol ◽  
Chanchana Thanachayanont ◽  
Tosawat Seetawan
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Single Phase ◽  
Hexagonal Structure ◽  
Hexagonal Crystal Structure ◽  
X Ray Diffraction ◽  
Hexagonal Crystal ◽  
X Ray ◽  
Transmission Electron

Crystal structure of Zn0.96Al0.02Ga0.02O was analyzed by X-Ray diffraction (XRD) technique and the microstructure was observed by scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The XRD results showed single phase and hexagonal structure a = b = 3.24982 Å, and c = 5.20661 Å. The SEM and TEM results showed the grain size of material arrangement changed after sintering and TEM diffraction pattern confirmed hexagonal crystal structure of Zn0.96Al0.02Ga0.02O after sintering.

Synthesis and Characterization of Manganese Oxide/CNTs Composites as Electrochemical Capacitor Electrode Materials

2012 ◽  
Vol 519 ◽  
pp. 197-200
Author(s):  
Ye Yan ◽  
Ji Zhao Zou ◽  
Xie Rong Zeng
Keyword(s):  
Crystal Structure ◽  
Manganese Oxide ◽  
Electrode Materials ◽  
Synthesis Method ◽  
Electrochemical Capacitor ◽  
Cycling Performance ◽  
Synthesis And Characterization ◽  
Heating Equipment ◽  
Microwave Assisted

Manganese oxide (MnO2)/Carbon nanotubes(CNTs) composites were prepared by a home-made microwave heating equipment. The crystal structure, microstructure, electrochemical properties were characterized by XRD and SEM, the discharge capacity and cycling performance were compared. The results show a birnessite-type MnO2 coating can be prepared. In this paper, a microwave-assisted hydrothermal synthesis method was used to synthesize the MnO2/CNTs composites. MnO2 content increases with the increasing of microwave power, which result in the specific capacitances of as-perpared materials increase

Fabrication and Characterization of Size- and Shape-Controlled C60 Nano/microcrystals by Solvent-Induced Reprecipitation Process (SIRP)

2007 ◽  
Vol 1054 ◽  
Author(s):  
Akito Masuhara ◽  
Zhenquan Tan ◽  
Hitoshi Kasai ◽  
Hachiro Nakanishi ◽  
Hidetoshi Oikawa
Keyword(s):  
Crystal Structure ◽  
Molar Ratio ◽  
Hexagonal Crystal Structure ◽  
Hexagonal Crystal ◽  
Crystal Solvates ◽  
Integrated Devices ◽  
Shape Controlled ◽  
Fabrication And Characterization ◽  
Shape And Size

ABSTRACTWe have first developed useful Solvent-Induced Reprecipitation Process, and have first succeeded in fabricating C60 nano/microcrystals with various shape and size, using m-xylene and 2-propanol as good and poor solvents, respectively.It was found that the resulting C60 nano/microcrystals had a hexagonal crystal structure, and that were a kind of crystal solvates in which the molar ratio of C60 to m-xylene was 3:2. C60 nano/microcrystals could be said to be important nano components of integrated devices in electronics.

Aqueous combustion synthesis and characterization of ZnO powders

2011 ◽  
Vol 129 (3) ◽  
pp. 881-886 ◽  
Author(s):  
Robert Ianoş ◽  
Ioan Lazău ◽  
Cornelia Păcurariu ◽  
Paula Sfîrloagă
Keyword(s):  
Combustion Synthesis ◽  
Synthesis And Characterization ◽  
Zno Powders

Synthesis and Characterization of Nanocrystalline ZnO Powders by a Direct Thermal Decomposition Route Using Zinc Nitrate Hexahydrate

2013 ◽  
Vol 770 ◽  
pp. 68-71 ◽  
Author(s):  
Supphadate Sujinnapram ◽  
Uraiphorn Termsuk ◽  
Atcharawan Charoentam ◽  
Sutthipoj Sutthana
Keyword(s):  
Thermal Decomposition ◽  
Crystallization Temperature ◽  
Zinc Nitrate ◽  
Zinc Nitrate Hexahydrate ◽  
Absorption Peak ◽  
Synthesis And Characterization ◽  
Nitrate Hexahydrate ◽  
Different Temperatures ◽  
Zno Powders

The nanocrystalline ZnO powders were synthesized by a direct thermal decomposition using zinc nitrate hexahydrate as starting materials. The precursor was characterized by TG-DTA to determine the thermal decomposition and crystallization temperature which was found to be at 325 oC. The precursors were calcined at different temperatures of 400, 500, and 600°C for 4 h. The structure of the prepared samples was studied by XRD, confirming the formation of wurtzite structure. The synthesized powders exhibited the UV absorption below 400 nm (3.10 eV) with a well defined absorption peak at around 285 nm (4.35 eV). The estimated direct bandgaps were obtained to be 3.19, 3.16, and 3.14 eV for the ZnO samples thermally decomposed at 400, 500, and 600°C, respectively.

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