Specific Immobilization of Electropolymerized Polypyrrole Thin Films OntoInterdigitated Microsensor Electrode Arrays

摘要

Electroactive polypyrrole (PPy) thin films were grown by potentiostaticelectropolymerization at chemically derivatized interdigitated microsensor electrodes (IMEs) of gold on borosilicate glass leading to specific adhesion of the electroconductive polymer film to the device. Films were grown to a constant electropolymerization charge density of 70 mC/sq cm at 0.65 V vs Ag (sup o)/AgCl, 3 M Cl(-) from 1.0 M aqueous pyrrole solutions containing 5% poly(styrenesulfonic acid) (PSSA) and 1% dodecylbenzynesulphonate with the pH adjusted to 3.0 and the temperature maintained at 20 deg C. The interdigit space of the IME devices was chemically derivatized by chemical modification with 3-aminopropyltrimethoxysilane followed by direct linking of the 10 amine to the carboxylic acid of 3-(l-pyrrolyl)propionic acid using the heterobifunctional linker 1,3-diisopropylcarbodiimide enhanced with N-hydroxysulfosuccinimide in aqueous solution. The 3-(l-pyrrolyl)propionic acid was shown to be electroactive, electropolymerizable, and coelectropolymerizable with pyrrole monomer from aqueous solution. jg p.2.