Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 88, Issue 1, Pages 402-406Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2011.07.021
Keywords
Carbon ionic liquid electrode; Multi-walled carbon nanotubes; Square wave voltammetry; Dopamine; Selective detection
Funding
- National Outstanding Youth Foundations of China
- National Science Foundation of China [50725825]
- Special Research Found for the Doctoral Program of Higher Education of China [20060532006]
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A simple, sensitive, and reliable method based on a multi-walled carbon nanotubes (MWNTs) modified carbon ionic liquid electrode (CILE) has been successfully developed for determination of dopamine (DA) in the presence of ascorbic acid (AA). The acid-treated MWNTs with carboxylic acid functional groups could promote the electron-transfer reaction of DA and inhibit the voltammetric response of AA. Due to the good performance of the ionic liquid, the electrochemical response of DA on the MWNTs/CILE was better than that of other MWNTs modified electrodes. Under the optimum conditions a linear calibration plot was obtained in the range 5.0 x 10(-8) to 2.0 x 10(-4) mol L(-1) and the detection limit was 1.0 x 10(-8) mol L(-1). (C) 2011 Elsevier B.V. All rights reserved.
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