Investigation on electrochemical properties of carbon nanotubes

被引:56
作者
Hu, CG [1 ]
Wang, WL
Wang, SX
Zhu, W
Li, Y
机构
[1] Chongqing Univ, Dept Appl Phys, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Key Lab Educ Minist Photoelect Technol & Syst, Chongqing 400044, Peoples R China
[3] Chongqing Univ, Dept Chem, Chongqing 400044, Peoples R China
关键词
carbon nanotube; electrochemistry; carboxyl modification; cyclic voltammetry;
D O I
10.1016/S0925-9635(03)00071-2
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The electrochemical behavior of carboxyl-modified carbon nanotube (CNT) films was investigated. The structure of the modified CNT was characterized by scanning electron microscopy, Raman spectroscopy and infrared spectroscopy. Experimental results showed that the physical structure of CNTs was not changed, but the ends of CNT were opened, and oxidized into carboxylate groups, which might react with other reagents. Cyclic voltammetry of Fe2+ was conducted in 0.2 M HClO4, A stable, quasi-reversible voltammetric response is seen for Fe3+/(2+) at the carboxyl-modified CNT electrode, and the anodic and the cathodic peak potentials were 1.120 and 0.145 V vs. saturated calomel electrode at a scan rate of 0.15 V s(-1), respectively. Both anodic and cathodic peak currents depended linearly on the square root of the scan rate over the range of 0.025-0.2 V s(-1), which suggested that the process of the electrode reactions was diffusion-controlled. There were significant differences in voltammetry between the non-modified CNT surface and the carboxyl-modified CNT surface for Fe2+. The low level and stable detection of hydrazine was performed in a phosphate buffer pH 6.6. The peak current increased linearly with the hydrazine concentration from 0.01 to 1 mM and the concentration limit of quantitation was 0.01 mM. The results obtained are discussed in detail. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:1295 / 1299
页数:5
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