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Electrocatalysis and determination of uracil on polythionine/multiwall carbon nanotubes modified electrode
Author(s) -
Liu Hongying,
Wang Guangfeng,
Hu Jinsong,
Chen Daolei,
Zhang Wei,
Fang Bin
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.27508
Subject(s) - thionine , carbon nanotube , electrode , materials science , differential pulse voltammetry , electrocatalyst , detection limit , cyclic voltammetry , electrochemistry , chemical engineering , analytical chemistry (journal) , chemistry , nanotechnology , organic chemistry , chromatography , engineering
A new type of poly (thionine)/multiwall carbon nanotube/glassy carbon (PTH/MWNTs/GC) electrode was fabricated by electropolymerization thionine onto the surface of MWNTs modified GC electrode. The properties and behaviors of the modified electrode were characterized by scanning electron microscopy (SEM) and cyclic voltammetry (CV). The results show that the high sensitivity and selectivity are mainly caused by the unique carbon surface of the carbon nanotubes and the catalytic activity of thionine. The modified electrode exhibited excellent electrocatalytic behavior to the oxidation of uracil, and was firstly applied to determinate the concentration of uracil for the differential pulse voltammograms. Under the optimum conditions, linear calibration equation was obtained over the uracil concentration range from 1.0 × 10 −5 to 5.5 × 10 −2 M with a correlation coefficient of 0.9978 and a detection limit 2.0 × 10 −7 M (based on S / N = 3) was also gained. The good electrocatalytic response of uracil at PTH/MWNTs/GC electrode suggests that the PTH/MWNTs are an excellent platform for electrochemical biosensing. The modified electrode displays excellent repeatability, stability, and high sensitivity. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008