Synthesis and photocatalytic properties of Cu2O/BiOCl semiconductor films

2013 International Conference on Materials for Renewable Energy and Environment Pub Date : 2013-08-01 DOI:10.1109/ICMREE.2013.6893760

Cong Wang, Fangfang Zhang, Jiushan Cheng, Yinfang Cui, Sujuan Wu

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Abstract

Cu2O/BiOCl composite films were synthesized by a simple two-step-method: sol-gel dip-coating technique and magnetron sputtering. At first, the BiOCl thin film was prepared on indium tin oxide (ITO) substrate via a simple sol-gel dip-coating technique. Then the Cu2O thin film was fabricated on the surface of the BiOCl thin film by magnetron sputtering. Their photocatalytic activities were evaluated by photocatalytic degradation of Rhodamine B (RhB) under UV and visible light irradiation, respectively. It was found that the photocatalytic activity of the Cu2O/BiOCl composite films was higher than single BiOCl thin film and single Cu2O thin film. The photocatalytic efficiency of the as-synthesized films seems to strongly depend, that is mainly due to both of the Cu2O works as a sensitizer absorbing visible light and the Cu2O/BiOCl hetero-junction promoting the separation rate of photo-generated electron-hole pairs. The mechanism has been discussed on the interparticle charge transfer between two semiconductors while they have the suitable relative band position.

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Cu2O/BiOCl半导体膜的合成及其光催化性能

采用溶胶-凝胶浸涂和磁控溅射两步制备Cu2O/BiOCl复合薄膜。首先，通过简单的溶胶-凝胶浸涂技术在氧化铟锡(ITO)衬底上制备了BiOCl薄膜。然后用磁控溅射法在BiOCl薄膜表面制备Cu2O薄膜。通过紫外光催化降解罗丹明B (Rhodamine B, RhB)和可见光光催化降解Rhodamine B来评价它们的光催化活性。结果表明，Cu2O/BiOCl复合膜的光催化活性高于单一BiOCl薄膜和单一Cu2O薄膜。合成膜的光催化效率似乎强烈依赖于Cu2O作为吸收可见光的敏化剂，而Cu2O/BiOCl异质结促进了光生电子-空穴对的分离速率。讨论了当两个半导体具有合适的相对能带位置时粒子间电荷转移的机理。

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2013 International Conference on Materials for Renewable Energy and Environment

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