Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 134, Issue 2, Pages 780-786Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.06.028
Keywords
Poly(3-methylthiophene); Gold nanoparticles; Electrocatalysis; Nitrite; Iodate
Funding
- National Natural Science Foundation of China
- Anhui Normal University
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A promising electrochemical sensor was fabricated by electrodeposition of gold nanoparticles on poly(3-methylthiophene) (P3MT)-modified glassy carbon electrode (GCE), forming a nano-Au/P3MT composites-modified GCE (nano-Au/P3MT/GCE). Field emission scanning electron microscope (FE-SEM) and electrochemical techniques were used for the characterization of these composites. it was found that nano-Au/P3MT layer was very uniform, and formed a kind of nanoporous structure. Electrochemical experiments showed that this proposed nano-Au/P3MT composites-modified electrode exhibited excellent electrocatalytic properties for nitrite and iodate. Amperometry revealed that there existed a good linear relationship between peak current with the concentration in the range of 10-1000 mu M and the detection limit of 2.3 mu M for nitrite and in the range of 5-500 mu M and the detection limit of 1.4 mu M for iodate. The proposed method has been used as an amperometric detector for analysis of nitrite and iodate in iodized table salt and results were satisfactory. The nano-Au/P3MT composites-modified electrode had good storage stability, reproducibility and anti-interference ability for promising practical application. (C) 2008 Elsevier B.V. All rights reserved.
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