Electroactivity, stability and application in an enzyme switch at pH 7 of poly(aniline)–poly(styrenesulfonate) composite films

摘要: By incorporating high molecular weight poly(styrenesulfonate) as the counter-ion in poly(aniline) films good electroactivity and stability can be achieved for resulting composite buffered aqueous solution at pH 7. For short times (e.g. 30 min) 7 redox process is reversible reproducible. After 80 consecutive electrochemical cycles between –0.4 V +0.4 vs. SCE, film retains around 85% of its original activity determined by cyclic voltammetry 20 mV s–1. On prolonged contact with (overnight), a significant decrease observed. The affected concentration used growth solution, initially rising increasing then reaching plateau. In situ steady-state resistance measurements on show that potential corresponding to transition from insulating pernigraniline conducting emeraldine state shifts +280 5.0 +90 SCE film, deposited across gap dual microband electrode, was successfully employed microelectrochemical enzyme switch responsive glucose operating studies switching rates reusability were obtained indicating this type could form basis useful switches neutral solution.