高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

有序介孔材料SBA-15吸附Ru(bpy)2+3修饰电极的电化学发光研究

刘洋1,2, 杨秀荣1   

    1. 中国科学院长春应用化学研究所电分析化学国家重点实验室, 长春 130022;
    2. 中国科学院研究生院, 北京 100039
  • 收稿日期:2006-05-11 修回日期:1900-01-01 出版日期:2007-04-10 发布日期:2007-04-10
  • 通讯作者: 杨秀荣

Electrogenerated Chemiluminescence of Ru(bpy)2+3 Incorporated in Highly Order Mesoporous SBA-15 Material

LIU Yang1,2, YANG Xiu-Rong1*   

    1. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
    2. Graduate School of Chinese Academy of Sciences, Beijing 100039, China
  • Received:2006-05-11 Revised:1900-01-01 Online:2007-04-10 Published:2007-04-10
  • Contact: YANG Xiu-Rong

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摘要： 制备了具有高比表面积且二维六方高度有序的介孔分子筛SBA-15, 并采用TEM和氮气吸附实验对其结构性质进行了表征. 利用静电作用将三联吡啶钌[Ru(bpy)2+3]固定到表面带负电荷的SBA-15上, 并将吸附有Ru(bpy)2+3的SBA-15修饰到玻碳电极表面, 研究了该固定化的Ru(bpy)2+3的电化学发光行为. 结果表明, 随着三丙胺(TPA)的加入, 氧化电流增加而还原电流减小, 表明TPA对三价吡啶钌有催化作用, 同时TPA的加入显著增强了发光强度. 随着扫描速率的增加, 发光强度逐渐降低. SBA-15较大的孔径和开放交联的孔结构体系促进了电极表面膜内的物质扩散和电子运动扩散. 该修饰电极在5.0×10-5~1.0×10-2 mol/L TPA浓度范围内, 发光强度与浓度具有良好的线性关系, 线性方程为y=71.7+41.2x, 检出限为9.5×10-6 mol/L. 该电极在连续扫描下具有较好的稳定性.

关键词: 电化学发光, 介孔材料, SBA-15

Abstract: Highly ordered mesoporous SBA-15 was prepared and characterized by using TEM and N2 adsorption. The Ru(bpy)2+3 were incorporated into SBA-15 by electrostatic effect. The Ru(bpy)2+3 adsorbed on SBA-15 were immobilized on the surface of a glass carbon electrode and their electrogenerated chemiluminescence(ECL) were investigated. The oxidative current increased and the reductive currents decreased with the addition of tripropylamine(TPA), indicating that TPA presented an obvious catalysis to the oxidation of Ru(bpy)2+3. Meanwhile, the intensity of ECL increased sharply. The ECL intensity was decreased with the increase of scan rate which resulted from the large pore diameter and open pore structures of SBA-15 that improve the diffusion and electron transfer in the SBA-Nafion composite films on the electrodes. The modified electrodes of Ru(bpy)2+3 adsorbed on SBA-15 presented an excellent linear relationship between the ECL intensity and the concentration of TPA in the range of 5.0×10-5—1.0×10-2 mol/L with a linear equation of y=71.7+41.2x and showed a good stability in successive 10 cycles, which would be attributed to the high specific area and ordered mesoporous structures of SBA-15.

Key words: Electrogenerated chemiluminescence, Mesoporous material, SBA-15

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