Li, Haohua and Liang, Chaolun and Zhong, Kuan and Liu, Meng and Hope, Greg A. and Tong, Yexiang and Liu, Peng (2009) The Modulation of Optical Property and its Correlation with Microstructures of ZnO Nanowires. Nanoscale Research Letters, 4 (10). pp. 1183-1190. ISSN 1931-7573 (Print) 1556-276X (Online)
Official URL: http://www.springerlink.com/content/q778x27l382281...
ZnO nanowires with both good crystallinity and oxygen vacancies defects were synthesized by thermal oxidation of Zn substrate pretreated in concentrated sulfuric acid under the air atmosphere, Ar- and air-mixed gas stream. The photoluminescence spectra reveal that only near-band-edge (NBE) emission peak was observed for the sample grown in the air atmosphere; the broad blue-green and the red-shifted NBE emission peaks were observed for the sample grown in the mixed gas stream, indicating that the sample grown in the mixed gas stream has a defective structure and its optical properties can be modulated by controlling its structure. The high-resolution transmission electron microscope and the corresponding structural simulation confirm that the oxygen vacancies exist in the crystal of the nanowires grown in the mixed gas stream. The ZnO nanowires with oxygen vacancies defects exhibit better photocatalytic activity than the nanowires with good crystallinity. The photocatalytic process obeys the rules of first-order kinetic reaction, and the rate constants were calculated.
|Uncontrolled Keywords:||ZnO nanowires - Thermal oxidation - Oxygen vacancies - Photoluminescence - Photocatalysis|
|Subjects:||Physical Science > Nanophysics|
Analytical Science > Microscopy and probe methods
Physical Science > Photonics
|Deposited By:||Lesley Tobin|
|Deposited On:||13 Nov 2009 16:10|
|Last Modified:||13 Nov 2009 16:12|
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