Oxidative modification of multi-wall carbon nanotubes for the electrochemical detection of dopamine

GUO Cong-xiu; WANG Yun-wei; TONG Xi-li; GUO Xiang-yun

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Article Navigation > New Carbon Mater. > 2016 > 31(5): 485-491

GUO Cong-xiu, WANG Yun-wei, TONG Xi-li, GUO Xiang-yun. Oxidative modification of multi-wall carbon nanotubes for the electrochemical detection of dopamine. New Carbon Mater., 2016, 31(5): 485-491.

Citation:

GUO Cong-xiu, WANG Yun-wei, TONG Xi-li, GUO Xiang-yun. Oxidative modification of multi-wall carbon nanotubes for the electrochemical detection of dopamine. New Carbon Mater., 2016, 31(5): 485-491.

GUO Cong-xiu, WANG Yun-wei, TONG Xi-li, GUO Xiang-yun. Oxidative modification of multi-wall carbon nanotubes for the electrochemical detection of dopamine. New Carbon Mater., 2016, 31(5): 485-491.

Citation:

GUO Cong-xiu, WANG Yun-wei, TONG Xi-li, GUO Xiang-yun. Oxidative modification of multi-wall carbon nanotubes for the electrochemical detection of dopamine. New Carbon Mater., 2016, 31(5): 485-491.

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Oxidative modification of multi-wall carbon nanotubes for the electrochemical detection of dopamine

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
2.
University of the Chinese Academy of Sciences, Beijing 100049, China

Funds: In-house Project of SKLCC of China (2014BWZ006).

Received Date: 2016-06-15
Accepted Date: 2016-10-28
Rev Recd Date: 2016-10-09
Publish Date: 2016-10-28

Abstract

Abstract

Multi-wall carbon nanotubes (MWCNTs) with different degrees of oxidation were prepared by a wet chemical oxidation method. Their morphology and chemical composition were characterized by infrared spectroscopy, X-ray photoelectron spectroscopy and transmission electron microscopy. The oxidized MWCNTs were coated on glassy carbon for use as electrodes and their electrocatalytic oxidation activities for dopamine, ascorbic acid and uric acid were investigated by cyclic voltammetry and differential pulse voltammetry in order to evaluate their performance for selective dopamine detection. Results indicated that the electrocatalytic oxidation activities are dependent on both the electron transfer resistance of the graphitic layers and the electrostatic attraction between dopamine and carboxyl groups on the MWCNTs. Optimized MWCNTs with an appropriate content of carboxyl groups and nearly complete graphitic layers have a wide linear response current range for dopamine contents from 2 to 100 μM, and can be used for the selective detection of dopamine in the presence of ascorbic acid and uric acid.
- Multi-walled carbon nanotubes,
- Dopamine,
- Pulse voltammetry,
- Electrocatalysis

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References(26)

References

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