Open Access Nano Express

Flower-like ZnO-Ag2O composites: precipitation synthesis and photocatalytic activity

Lingling Xu1*, Bo Wei2, Weilong Liu2, Hailin Zhang1, Chunyan Su3 and Jixin Che4

Author Affiliations

1 Key Laboratory of Photonic and Electric Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, People’s Republic of China

2 Department of Physics, Harbin Institute of Technology, Harbin 150080, People’s Republic of China

3 Department of Physics, Harbin University, Harbin 150086, People’s Republic of China

4 The Aviation University of Air Force, Changchun 130022, People’s Republic of China

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Nanoscale Research Letters 2013, 8:536  doi:10.1186/1556-276X-8-536

Published: 19 December 2013

Abstract

Ag2O-decorated flower-like ZnO composites were fabricated through a chemical precipitation process. X-ray diffraction analysis confirms the co-existence of cubic Ag2O and wurtzite ZnO phases. Scanning electron microscopy images reveal Ag2O nanoparticles located on the rough surface of ZnO flowers. The photocatalytic activities of the composites with various mole ratios were evaluated by the degradation of methyl orange (MO) under ultraviolet irradiation, which confirms that the composite shows superior activity to that of pure ZnO and Ag2O. The improvement can be ascribed to the deposited Ag2O forming the p-n junction at the interface of ZnO and Ag2O, resulting in the transfer of photocarriers and suppressing the electron–hole recombination rate.

Keywords:
ZnO; Ag2O; Photocatalytic activity; Composite