Interaction of CO2with ZnO Powders of Different Microcrystalline Surfaces

1996 ◽  
pp. 347-356 ◽  
Author(s):  
A. Guerrero-Ruiz ◽  
I. Rodriguez-Ramos
Keyword(s):  
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.

Influence of Cd doping on structural and optical properties of (Cd, Al)-codoped ZnO powders synthesized via sol–gel method

2015 ◽  
Vol 645 ◽  
pp. 529-534 ◽  
Author(s):  
Libing Duan ◽  
Xiaoru Zhao ◽  
Yajun Wang ◽  
Hao Shen ◽  
Wangchang Geng ◽  
...  
Keyword(s):  
Optical Properties ◽  
Sol Gel ◽  
Structural And Optical Properties ◽  
Gel Method ◽  
Sol Gel Method ◽  
Cd Doping ◽  
Zno Powders

Influence of annealing atmosphere on optical properties of Al-doped ZnO powders

2012 ◽  
Vol 209 (8) ◽  
pp. 1538-1542 ◽  
Author(s):  
Chundong Li ◽  
Jinpeng Lv ◽  
Bo Zhou ◽  
Zhiqiang Liang
Keyword(s):  
Optical Properties ◽  
Annealing Atmosphere ◽  
Zno Powders ◽  
Doped Zno

Combustion synthesized ZnO powders for varistor ceramics

1999 ◽  
Vol 1 (3-4) ◽  
pp. 235-241 ◽  
Author(s):  
V.C. Sousa ◽  
A.M. Segadães ◽  
M.R. Morelli ◽  
R.H.G.A. Kiminami
Keyword(s):  
Zno Powders

Comparison of dye degradation efficiency using ZnO powders with various size scales

2007 ◽  
Vol 141 (3) ◽  
pp. 645-652 ◽  
Author(s):  
H WANG ◽  
C XIE ◽  
W ZHANG ◽  
S CAI ◽  
Z YANG ◽  
...  
Keyword(s):  
Dye Degradation ◽  
Degradation Efficiency ◽  
Zno Powders ◽  
Size Scales

Effect of cobalt doping on microstructures and dielectric properties of ZnO

2019 ◽  
Vol 97 (3) ◽  
pp. 227-232 ◽  
Author(s):  
Ye Zhao ◽  
Fan Tong ◽  
Mao Hua Wang
Keyword(s):  
Zno Nanoparticles ◽  
Sol Gel ◽  
Hexagonal Wurtzite Structure ◽  
Sem Analysis ◽  
Co Doping ◽  
In Doping ◽  
Zno Powders ◽  
Doped Zno ◽  
Zno Crystal ◽  
Co Doped

Pure and cobalt-doped ZnO nanoparticles (2.5, 5, 7.5, and 10 atom % Co) are synthesized by sol–gel method. The as-synthesized nanoparticles are characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and field emission scanning electron microscopy (FE-SEM) analysis. The nanoparticles of 0, 2.5, and 5 atom % Co-doped ZnO exhibited hexagonal wurtzite structure and have no other phases. Moreover, the (101) diffraction peaks position of Co-doped ZnO shift toward a smaller value of diffraction angle compared with pure ZnO powders. The results confirm that Co ions were well incorporated into ZnO crystal lattice. Simultaneously, Co doping also inhibited the growth of particles, and the crystallite size decreased from 43.11 nm to 36.63 nm with the increase in doping concentration from 0 to 10 atom %. The values of the optical band gap of all Co-doped ZnO nanoparticles gradually decreased from 3.09 eV to 2.66 eV with increasing Co content. Particular, the dielectric constant of all Co-doped ZnO ceramics gradually increased from 1.62 × 103 to 20.52 × 103, and the dielectric loss decreased from 2.36 to 1.28 when Co content increased from 0 to 10 atom %.

Solution combustion synthesis of ZnO powders using various surfactants as fuel

2018 ◽  
Vol 89 (2) ◽  
pp. 586-593 ◽  
Author(s):  
H. Vahdat Vasei ◽  
S. M. Masoudpanah ◽  
M. Adeli ◽  
M. R. Aboutalebi
Keyword(s):  
Combustion Synthesis ◽  
Solution Combustion Synthesis ◽  
Solution Combustion ◽  
Zno Powders

scholarly journals Soft X-ray nanospectroscopy for quantification of X-ray linear dichroism on powders

2021 ◽  
Vol 28 (4) ◽  
Author(s):  
Selwin Hageraats ◽  
Mathieu Thoury ◽  
Stefan Stanescu ◽  
Katrien Keune
Keyword(s):  
Fresnel Zone ◽  
Dipole Moments ◽  
Fundamental Property ◽  
Linear Dichroism ◽  
Model Parameters ◽  
Transition Dipole ◽  
X Ray ◽  
Zno Powders ◽  
The Individual ◽  
Absorption Features

X-ray linear dichroism (XLD) is a fundamental property of many ordered materials that can for instance provide information on the origin of magnetic properties and the existence of differently ordered domains. Conventionally, measurements of XLD are performed on single crystals, crystalline thin films, or highly ordered nanostructure arrays. Here, it is demonstrated how quantitative measurements of XLD can be performed on powders, relying on the random orientation of many particles instead of the controlled orientation of a single ordered structure. The technique is based on a scanning X-ray transmission microscope operated in the soft X-ray regime. The use of a Fresnel zone plate allows X-ray absorption features to be probed at ∼40 nm lateral resolution – a scale small enough to probe the individual crystallites in most powders. Quantitative XLD parameters were then retrieved by determining the intensity distributions of certain diagnostic dichroic absorption features, estimating the angle between their transition dipole moments, and fitting the distributions with four-parameter dichroic models. Analysis of several differently produced ZnO powders shows that the experimentally obtained distributions indeed follow the theoretical model for XLD. Making use of Monte Carlo simulations to estimate uncertainties in the calculated dichroic model parameters, it was established that longer X-ray exposure times lead to a decrease in the amplitude of the XLD effect of ZnO.

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