高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (11): 2067.

• 综合评述 • 上一篇    下一篇

多壁碳纳米管-Nafion化学修饰电极在高浓度抗坏血酸和尿酸体系中选择性测定多巴胺

孙延一, 吴康兵, 胡胜水   

  1. 武汉大学化学与分子科学学院, 武汉430072
  • 收稿日期:2002-06-12 出版日期:2002-11-24 发布日期:2002-11-24
  • 通讯作者: 胡胜水(1946年出生),男,教授,博士生导师,从事生物电化学及电分析研究.E-mail:sshu@whu.edu.cn E-mail:sshu@whu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:60171023);湖北省重点科技发展项目(批准号:20001P0211);湖北省自然科学基金(批准号:99J066)资助

Selective Determination of Dopamine in the Presence of High Concentration Ascorbic Acid and Uric Acid Using Carbon Nanotube Modified Glassy Carbon Electrode

SUN Yan-Yi, WU Kang-Bing, HU Sheng-Shui   

  1. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
  • Received:2002-06-12 Online:2002-11-24 Published:2002-11-24

PDF (PC)

被引次数

191

关键词: 多壁碳纳米管, Nafion, 多巴胺, 化学修饰电极

Abstract: A homogeneous dispersion of multiwall carbon nanotubes(MWNT) was achieved by dispersing MWNT into 0.1% Nafion ethanol solution, and a uniform cast film at a glassy carbon electrode(GCE) was obtained via solvent evaporation of the MWNT dispersion. A reversible two-electron redox reaction of dopamine was observed at the MWNT-Nafion modified GCE. In comparison with a bare GCE and a Nafion-modified GCE, MWNT-Nafion modified GCE has a higher sensitivity for dopamine. This modified GCE has an excellent selectivity towards dopamine even in the presence of high concentration ascorbic acid(AA) and uric acid(UA) since AA and UA have no observable electrochemical responses at the modified GCE. The electrochemical behavior of dopamine was closely related to the pH of the buffer solution. The oxidation peak current was proportional to the concentration of dopamine over the range from 5×10-8 to 1×10-6 mol/L, and a detection limit of 2.5×10-9 mol/L was obtained after 3 min open-circuit accumulation. The dispersion and morphology of MWNT-Nafion film were investigated by transmission electron microscopy(TEM).

Key words: Multi-wall carbon nanotube, Nafion, Dopamine, Chemically modified electrode

中图分类号: 

TrendMD: