Acta Chimica Sinica ›› 2010, Vol. 68 ›› Issue (05): 367-373.     Next Articles

Full Papers

有机钌螯合物/TiO2杂化膜修饰电极上Pt纳米团簇的光电流增强效应

周环,王舜*,林娟娟,陈锡安,蔡晓庆,温海虹,蒋峰   

  1. (温州大学纳米材料与化学重点实验室 温州 325027)
  • 投稿日期:2009-08-30 修回日期:2009-11-02 发布日期:2010-03-14
  • 通讯作者: 王舜 E-mail:shunwang@wzu.edu.cn
  • 基金资助:

    国家自然科学基金(No. 20471043;No. 20843003)、浙江省自然科学基金(No.Y408177;No.Y404118)和浙江省科技计划(No. 2007C21134)资助项目.

Enhanced Photocurrent of an ITO Electrode by the Photodeposition of Pt Nanoclusters onto a Monolayer TiO2-Ru Complex Hybrid Film

Zhou Huan Wang Shun* Lin Juanjuan Chen Xi'an Cai Xiaoqing Wen Haihong Jiang Feng   

  1. (Nano-materials & Chemistry Key Laboratory, Wenzhou University, Wenzhou 325027)
  • Received:2009-08-30 Revised:2009-11-02 Published:2010-03-14
  • Contact: WANG Shun E-mail:shunwang@wzu.edu.cn

An indium tin oxide (ITO) electrode modified with mono-/multilayer TiO2/[Ru(phen)2- (dC18bpy)]2+ [phen=1,10-phenanthroline, dC18bpy=4,4'-dioctadecyl-2,2'-bipyridyl] hybrid film [denoted as ITO/(TiO2-Ru)n] has been prepared by a modified Langmuir-Blodgett (LB) method. The effects of Pt-photodeposition on the photocurrent of above ITO/(TiO2-Ru)n electrode were studied. Our experiments illustrated: (1) the single-layered hybrid film of TiO2/[Ru(phen)2(dC18bpy)]2+ (denoted as TiO2-Ru) was closely packed at a surface pressure of 25 mN•m-1 and had a thickness of (3.60±0.5) nm; (2) under light irradiation (λ>360 nm), Pt clusters with radii of 20~160 nm were authentically observed by the reduction of [Pt(NH3)6]4+ through the TiO2-Ru hybrid film; (3) the enhanced photocurrent was achieved by depositing the Pt nanocluster onto the surface of the ITO/(TiO2-Ru)n electrodes at the applied potential above 500 mV (vs. Ag|AgCl|KCl) under light irradiation (λ>360 nm). For example, the photocurrent of ITO/TiO2-Ru/Pt was increased about 5 times in comparison with an ITO/TiO2-Ru electrode at the applied potential 900 mV when they were both in contact with 0.1 mol•L-1 NaClO4 solution. Such a result indicates that the Pt clusters are able to hamper the combination of electron hole pairs and reduce the counterwork of insulating long alkyl chains of amphiphilic Ru(II) complexes, and thus produce the enhanced photocurrent; (4) the photocurrent was strongly dependent on the number of TiO2-Ru hybrid films. With the increase in the number of layers from one, two to four, the photocurrent intensity was found to firstly increase and then decrease, suggesting that the electron transfer be directly through the electrochemically inactive TiO2 monolayer.

Key words: Langmuir-Blodgett method, organic-inorganic hybrid film, Pt nanocluster, modified electrode, enhanced photocurrent