Acta Chimica Sinica ›› 2007, Vol. 65 ›› Issue (21): 2405-2410. Previous Articles     Next Articles



  1. (1上海大学化学系 上海 200444)
    (2上海第二工业大学环境工程系 环境功能材料实验室 上海 201209)
  • 投稿日期:2007-03-13 修回日期:2007-05-22 发布日期:2007-11-14
  • 通讯作者: 董俊萍

Electrochemical Behavior of Nitrogen-Doped Carbon Nanotube Modified Electrodes

DONG Jun-Ping*,1; QU Xiao-Min1; WANG Li-Jun2; WANG Tian-Lin1   

  1. (1 Department of Chemistry, Shanghai University, Shanghai 200444)
    (2 Department of Environmental Engineering, Shanghai Second Polytechnic University, Shanghai 201209)
  • Received:2007-03-13 Revised:2007-05-22 Published:2007-11-14
  • Contact: DONG Jun-Ping

The nitrogen-doped carbon nanotube (CNx nanotube) modified glassy carbon elec-trodes were prepared for the study of electrochemical behavior of dopamine (DA) and ascorbic acid (AA). The effects of the content of nitrogen in the framework of CNx nanotubes on the electrochemical behavior of DA and AA at the modified glassy carbon electrodes were investigated in acidic and neutral buffer solutions. The results of cyclic voltammetry indicated that the CNx nanotube modified electrodes with a high content of nitrogen exhibited higher electrocatalytic activities for the AA, the modified electrodes with a low content of nitrogen, however, showed the favorable electrocatalytic activity for DA. Additionally, the modified electrodes showed a linear response to DA in the concentration range of 5.0×10-6~2.0×10-4 mol/L and AA in the concentration range of 3.0×10-5~1.0×10-2 mol/L. The detection limit (S/N=3) is 1.64×10-6 mol/L for DA and 3.26×10-6 mol/L for AA, respectively. Such different catalytic behavior for DA and AA allowed the determination of DA in the presence of extremely excess AA (up to 20000 fold).

Key words: nitrogen-doped carbon nanotube, modified electrode, dopamine, ascorbic acid