Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 188, Issue -, Pages 405-410Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.07.038
Keywords
Dopamine; Carbon nanotubes; Conducting polymer; Poly(3,4-ethylenedioxythiophene); Nanocomposite; Ascorbic acid
Funding
- National Natural Science Foundation of China [21275087]
- Natural Science Foundation of Shandong Province of China [ZR2012BM008]
- Taishan Scholar Program of Shandong Province, China
- National Science Foundation [0748001]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0748001] Funding Source: National Science Foundation
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A highly stable and sensitive electrochemical sensor for the detection of dopamine (DA) was developed based on the electrodeposited conducting polymer, poly(3,4-ethylenedioxythiophene) (PEDOT), doped with pure carbon nanotubes (CNTs). The PEDOT/CNT nanocomposite was deposited on the carbon paste electrode through the electrochemical polymerization of PEDOT in the presence of CNTs as the only dopant. The electrochemical properties of the PEDOT/CNT film on the carbon paste electrode were characterized using cyclic voltammetry and differential pulse voltammetry. The PEDOT/CNT film showed high electrocatalytic activity toward the redox reaction of DA, and the redox peak current of DA at the PEDOT/CNT modified electrode was related to the DA concentration. A sensitive DA sensor was developed based on this excellent catalytic property, with a linear range from 0.1 to 20 mu M, and a detection limit of 20 nM. This sensor is easy to fabricate, very stable and reusable, and free of interference from ascorbic acid (present at a concentration 1000 times higher than that of DA), all of which makes it a promising technology for DA sensing. (C) 2013 Elsevier B.V. All rights reserved.
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