吡硫醇在单壁碳纳米管修饰电极上电化学行为的研究  

Electrochemical behavior of pyritinol at a single-wall carbon nanotube-modified electrode

作　　者：马啸华[1] 徐茂田[1] 孔粉英[1] 

机构地区：[1]商丘师范学院化学系,商丘476000

出　　处：《分析试验室》2009年第12期14-17,共4页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金(20775047);河南省自然科学基金(0511022300)项目资助

摘　　要：研究了吡硫醇在单壁碳纳米管修饰电极上的电化学行为,提出了一种检测吡硫醇的电化学方法。在0.1 mol/L的NaAc-HAc(pH 4.0)缓冲溶液中,吡硫醇在单壁碳纳米管修饰电极上出现一灵敏的氧化峰,峰电位位于0.94 V处。与裸玻碳电极相比,单壁碳纳米管修饰电极显著提高了吡硫醇的氧化峰电流。在最佳实验条件下,吡硫醇浓度在9.9×10-6～5.7×10-4mol/L范围内与峰电流呈良好的线性关系,检出限为2.98×10-7mol/L。吡硫醇在单壁碳纳米管修饰电极上的氧化过程受吸附控制,为1电子2质子的过程。The electrochemical behavior of pyritinol at the single-wall carbon nanotube （SWNT）-modified electrode is investigated. In a 0.10 mol/L NaAc-HAc buffer （pH 4.0）, pyritinol exhibits a well-defined and sensitive oxidation peak at the SWNT-modified electrode. The oxidation peak potential is at ca. 0.94 V （vs. SCE）. The oxidation peak currem of pyritinol significantly increases at the SWNT-modified electrode in comparison with that at the bare electrode. Under the optimum conditions, the oxidation peak current is proportional to the concentration of pyritinol over the range from 9.9× 10^-6 to 5.7 × 10^-4 mol/L, and the detection limit is 2.98 × 10^-7 mol/L. The electrode process is controlled by adsorption, and one electron and two protons are involved in the oxidation of pyritinol.

关 键 词：单壁碳纳米管 修饰电极 吡硫醇 电化学 

分 类 号：O657.1[理学—分析化学]