Effect of Porous Interfacial Layer of Carbon Nanotube Modified Electrodes on Electrochemical Discrimination of Dopamine from Ascorbic Acid

Abstract

Abstract: Modified electrodes were firstly constructed by casting or intercalating carbon nanotube on graphite surface, which resulted in a favorable discrimination of dopamine(DA) and ascorbic acid(AA), and the anodic potential difference(ΔE_pa) was more than 250 mV. Taking DA and AA as model compounds, further research on the separation mechanism of these modified electrodes was investigated by employing cyclic voltammetric and differential pulse voltammetric techniques. The results show that the solvent and the surfactant have a strong effect on ΔE_pa. Various types of carbon nanotubes(single wall, multi wall or helix multi wall) presented differences of ΔE_pa, while the diameter of the same kind of carbon nanotubes proved to have little effect on it. Furthermore, significant change on ΔE_pa was observed when carbon nanotube was oxidized by acids with different oxidation capability. All the results showed that the discrimination of DA from AA was mainly attributed to the tubular structure of the nanotubes and its functional group.

Key words: Carbon nanotube modified electrode, Porous interfacial layer, Discrimination, Dopamine, Ascorbic acid

CLC Number:

O657

TrendMD:

WANG Zong-Hua, LIU Jun, YAN Liu-Shui, WANG Yi-Ming, LUO Guo-An. Effect of Porous Interfacial Layer of Carbon Nanotube Modified Electrodes on Electrochemical Discrimination of Dopamine from Ascorbic Acid[J]. Chem. J. Chinese Universities, 2003, 24(2): 236.

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Effect of Porous Interfacial Layer of Carbon Nanotube Modified Electrodes on Electrochemical Discrimination of Dopamine from Ascorbic Acid

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