The electrochemical response of a graphite electrode modified with a polyeugenol-overoxidized polypyrrole composite film to dopamine and ascorbic acid was investigated by a voltammetric, method. The modification of the electrode was carried out by electropolymerization of monomer of eugenol and subsequent electropolymerization of pyrrole in an alkaline solution by cyclic voltammetry. The composite film modified electrode exhibited an enhanced anodic current response to dopamine by about 10 times compared to the bare electrode, while its anodic current response to ascorbic acid was suppressed by ca. a half compared to the bare electrode. Dopamine could be determined with a linear response range of 0.5-10 μmol/1, and with the sensitivity of 5.5 μA/μM. The origin of high selectivity and sensitivity of the present electrode modified with the composite film was estimated to be due to the oxidization of the surface of the electrode and modification with the polyeugenol-overoxidized polypyrrole composite film with permselectivity to dopamine against ascorbic acid.
|Number of pages||6|
|Publication status||Published - Dec 1 2004|
|Event||Chemical Sensors VI: Chemical and Biological Sensors and Analytical Methods - Proceedings of the International Symposium - Honolulu, HI, United States|
Duration: Oct 3 2004 → Oct 8 2004
|Other||Chemical Sensors VI: Chemical and Biological Sensors and Analytical Methods - Proceedings of the International Symposium|
|Period||10/3/04 → 10/8/04|
All Science Journal Classification (ASJC) codes