CSIR-National Metallurgical Laboratory, Jamshedpur 831 007, India.
Department of Metallurgical and Materials Engineering, IIT, Kharagpur 721 302, India.
J Colloid Interface Sci. 2012 Jan 15;366(1):8-15. doi: 10.1016/j.jcis.2011.09.065. Epub 2011 Oct 2.
The stabilization of defects in ZnO at high temperatures has been investigated. The properties of unmodified and modified ZnO nanoparticles (NPs) with 2 at.% of Ag prepared by microwave assisted combustion method, have been systematically studied using X-ray diffraction (XRD), photoluminescence (PL), X-ray photoelectron spectroscopy (XPS) and photocatalytic activity measurements. Though the XRD data shows a marginal shift in the ZnO peak position upon Ag addition, the amount of shift does not change with annealing temperatures. The PL data reveals that the defect mediated visible emission intensity of unmodified ZnO NPs increases with increase in the annealing temperature, whereas it remains almost unchanged in Ag-ZnO. This study clearly establishes that silver is an efficient stabilizer of intrinsic defects in ZnO at high temperatures. This is further supported by the core and valence band XPS spectra.
已经研究了 ZnO 中缺陷在高温下的稳定化。采用微波辅助燃烧法制备的 Ag 摩尔含量为 2%的未修饰和修饰 ZnO 纳米粒子（NPs）的性能，通过 X 射线衍射（XRD）、光致发光（PL）、X 射线光电子能谱（XPS）和光催化活性测量进行了系统研究。尽管 XRD 数据表明 Ag 掺杂后 ZnO 峰位置略有偏移，但偏移量并不随退火温度变化而变化。PL 数据表明，未修饰 ZnO NPs 的缺陷介导可见发射强度随退火温度的升高而增加，而在 Ag-ZnO 中则几乎保持不变。这项研究清楚地表明，银是 ZnO 中本征缺陷在高温下的有效稳定剂。这进一步得到了芯和价带 XPS 谱的支持。
