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ZnO纳米晶的溶胶–凝胶法合成与光催化性能 Photocatalytic Activity of ZnO Nanocrystals Synthesized by Sol-Gel Method

Author(s): 刘瑜 | 胡勇

Journal: Material Sciences
ISSN 2160-7613

Volume: 01;
Issue: 02;
Start page: 60;
Date: 2011;
Original page

Keywords: ZnO纳米晶 | 光催化降解 | 溶胶–凝胶 | ZnO Nanocrystals | Photodegradation | Sol-Gel

纳米ZnO是一种新型功能性纳米材料,因其具有优异的光学、电学等性质而受到人们的广泛关注。本文以醋酸锌为锌源,二甘醇为溶剂,采用溶胶–凝胶法成功制备了ZnO纳米晶。通过控制乙酸锌的浓度得到平均粒径为3.5,4.7,5.6,6.7,8.6 nm的ZnO纳米晶,借助X射线衍射(XRD),扫描电子显微镜(SEM),透射电子显微镜(TEM)多种测试手段对其进行了表征,XRD表明,产物为结晶良好的纤锌矿ZnO。通过降解罗丹明B(RhB)研究了样品的光催化性能,结果表明ZnO纳米晶光催化活性随着晶粒的减小而逐渐增强,并对这一现象进行了阐述。Zinc oxide (ZnO) was a new versatile material which has attracted much attention for its excellent optical and electrical properties. In this paper, ZnO nanocrystals were synthesized successfully via a facile sol-gel method, in which zinc acetate was used as zinc source and diethylene glycol was used as solvent. The ZnO nanocrystals with average size of 3.5, 4.7, 5.6, 6.7, and 8.6 nm were obtained by controlling the zinc precursor concentrations, respectively. The products were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), XRD pattern revealed that the ZnO nanocrystals are indexed as pure wurtzite phase with good crystallization. Furthermore, the pho-tocatalytic activity of the ZnO nanocrystals was investigated by degradation of the Rhodmine B (RhB), the results demonstrated that the photocatalytic activity of the ZnO nanocrystals was gradually enhanced with the decreasing of particle size.

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