DHP和SWCNTs促进[Ru(bpy)_2tatp]^(3+/2+)在ITO上的电化学组装  

Electrochemical Assembly of [Ru(bpy)_2tatp]^(3+/2+) Prompted by DHP and SWCNTs on an ITO Electrode

作　　者：郭清宇[1] 洪伟[1] 许娟[1] 李红[1] 

机构地区：[1]华南师范大学化学与环境学院,广州510006

出　　处：《高等学校化学学报》2009年第9期1824-1829,共6页Chemical Journal of Chinese Universities

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

摘　　要：应用循环伏安法和微分脉冲伏安法研究了[Ru(bpy)2tatp]3+/2+(bpy=2,2′-联吡啶,tatp=1,4,8,9-四氮三联苯)在ITO表面上的电化学组装及双十六烷基磷酸盐(DHP)和单壁碳纳米管(SWCNTs)对其组装效果的影响.研究结果表明,[Ru(bpy)2tatp]2+在ITO电极上1.057V(vs.Ag/AgCl)电位下呈现出清晰的扩散控制峰.随着连续伏安扫描次数的增多,微分脉冲伏安图逐渐呈现出明显的吸附控制峰.当DHP浓度在0.05～0.22mmol/L区间内时,不管有无SWCNTs存在,DHP均能增强[Ru(bpy)2tatp]2+在缓冲溶液中的扩散系数和促进其在ITO上的电化学组装,而SWCNTs在其中起减弱作用.讨论了DHP和SWCNTs参与的[Ru(bpy)2tatp]3+/2+在ITO上的电化学组装机理.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-wailed carbon nanotubes（SWCNTs） was investigated by cyclic vohammctry and differential pulse vohammetry. It is found that a well-defined peak appears at the formal potential of 1. 075 V （vs. Ag/AgC1） 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.

关 键 词：多吡啶钌(Ⅱ)配合物 双十六烷基磷酸盐 单壁碳纳米管 电化学组装 

分 类 号：O646[理学—物理化学]