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Ascorbate sensor based on ‘self‐doped’ polyaniline
Author(s) -
Zhou DongMei,
Xu JingJuan,
Chen HongYuan,
Fang HuiQun
Publication year - 1997
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140091512
Subject(s) - polyaniline , ascorbic acid , electrode , aniline , electrochemistry , polyaniline nanofibers , polymer , materials science , conductive polymer , doping , inorganic chemistry , copolymer , chemistry , analytical chemistry (journal) , chemical engineering , organic chemistry , polymerization , composite material , food science , optoelectronics , engineering
Self‐doped polyaniline modified electrodes were successfully fabricated by copolymerization of aniline and m ‐aminobenzoic acid in 0.5 mol L −1 sulfuric acid. The electrochemical characteristics of this resulting polymer were investigated. The polymer displayed electrochemical activity with the formal potential of 50 mV in pH 7.0 buffer solution. Also, such ‘self‐doped’ polyaniline was rather stable for a long‐term use. Ascorbate was electrocatalytically oxidized at these ‘self‐doped’ polymer‐modified electrodes. The effect of pH on the catalysis of ascorbate was explored. By constant potential method, such polymer was also deposited on a dual platinum disk electrode with a gap of 10 μm. The dependence of the film conductivity on the potential, which showed a peak‐shaped curve, was obtained. The device also showed a fast off‐on response sensitive to ascorbate with a linearity up to 6.0 × 10 −3 mol L −1 (correlation coefficient 0.996).