School of Chemistry and Chemical Engineering, Sun Yat-Sen University, 510275, Guangzhou, People's Republic of China.
Nanoscale Res Lett. 2009 Jul 1;4(10):1183-90. doi: 10.1007/s11671-009-9381-z.
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.
在空气气氛、Ar 和空气混合气流中，通过对在浓硫酸中预处理过的 Zn 基底进行热氧化，合成了具有良好结晶性和氧空位缺陷的 ZnO 纳米线。光致发光谱表明，在空气气氛中生长的样品仅观察到近带边（NBE）发射峰；在混合气流中生长的样品观察到宽的蓝绿色和红移的 NBE 发射峰，表明在混合气流中生长的样品具有缺陷结构，其光学性质可以通过控制其结构来调节。高分辨率透射电子显微镜和相应的结构模拟证实，氧空位存在于混合气体中生长的纳米线的晶体中。具有氧空位缺陷的 ZnO 纳米线表现出比具有良好结晶性的纳米线更好的光催化活性。光催化过程遵循一级动力学反应规律，并计算了速率常数。
