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Indexed by:Journal Papers

Date of Publication:2015-12-01

Journal:ELECTROANALYSIS

Included Journals:SCIE、Scopus

Volume:27

Issue:12

Page Number:2745-2752

ISSN No.:1040-0397

Key Words:Copolymerization; Dissolved oxygen; Electrochemistry; Methylene blue; Sensors

Abstract:Methylene blue (MB+) and pyrrole were copolymerised to electrodeposit a novel electroactive polymer on a Au electrode which was assessed for O-2 sensing. The electroactive polymer exhibits diffusion-limited behaviour and an electrochemical, followed by catalytic (EC') mechanism in the presence of dissolved O-2. Notably, it is pH-insensitive in both N-2-purged and air-equilibrated phosphate buffered saline (PBS) from pH 4 to 8. It is stable over 18 days, possesses a good sensitivity of 256.335 mu AmM(-1)cm(-2), wide linear range of 15 mu M to 285 mu M and detection limit of 1.47 mu M (S/N= 3) for dissolved O-2. It is highly promising for use in biological investigations where pH fluctuations are expected.