Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (9): 1824.

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Electrochemical Assembly of [Ru(bpy)2tatp]3+/2+ Prompted by DHP and SWCNTs on an ITO Electrode

GUO Qing-Yu, HONG Wei, XU Juan, LI Hong*   

  1. School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China
  • Received:2008-10-10 Online:2009-09-10 Published:2009-09-10
  • Contact: LI Hong. E-mail: lihong@scnu.edu.cn
  • Supported by:

    广东省教育厅自然科学基金(批准号: Z03020)和广州市科技计划项目(批准号: 2004J1-C0091)资助.

Abstract:

The electrochemical assembly of [Ru(bpy)2tatp]3+/2+(bpy=2,2′-bipypyridine, tatp=1,4,8,9-tetra-aza-triphenylene) on an ITO electrode with the participation of dihexadecyl phosphate(DHP) and single-walled carbon nanotubes(SWCNTs) was investigated by cyclic voltammetry and differential pulse voltammetry. It is found that a well-defined peak appears at the formal potential of 1.075 V(vs. Ag/AgCl) controlled by the diffusion process. And another adsorption-controlled peak appears gradually on the ITO electrode with increasing progressively voltammetric sweeping numbers. DHP in the absence or presence of SWCNTs can enhance the diffusion coefficient of [Ru(bpy)2tatp]2+ in buffer solution and prompt its electrochemical assembly on the ITO electrode in the DHP concentration range from 0.05 to 0.22 mmol/L. However, SWCNTs dispersed with DHP can weaken the DHP-enhanced assembly. In addition, the assembled mechanism of [Ru(bpy)2tatp]3+/2+ mediated by DHP and SWCNTs on the ITO surface is discussed in detail. The results provide a novel way for better fabricating redox molecule devices.

Key words: Polypyridyl ruthenium(Ⅱ) complex; Dihexadecyl phosphate; Single-walled carbon nanotube; Electrochemical assembly

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