Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 96, Issue 3, Pages 646-657Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2003.07.009
Keywords
poly(diphenylamine) (PDPA); poly(aniline) (PANI); copolymers; pH sensor; UV-Vis spectrum
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Thin films of poly(diphenylamine) (PDPA) and copolymers of diphenylamine (DPA) with aniline were deposited on indium tin oxide (ITO) coated glass employing constant-potential electropolymerization. Polymer films were characterized for optical transitions by UV-Visible (UV-Vis) spectroscopy. Though PDPA is one of the substituted poly (aniline) s (PANIs), distinct differences could be noticed in the optical characteristics of PDPA and copolymers in contrast to PANT. The presence of diphenoquinone imine structures in PDPA-based polymers cause clear variations in the pH ranges in which protonation/deprotonation of imine units of polymer occur. Optical characteristics of PDPA and the copolymers were followed in a wide pH range (2-13) using UV-Vis spectroscopy, and titration curves were developed. PDPA and the copolymers show pH-dependent optical variations (titration curves) which are quite different from PANT. The pH sensitivity, reproducibility, and response time of PDPA and the copolymers were evaluated and compared. PDPA showed a lower response time (7 s) than PANI. (C) 2003 Elsevier B.V. All rights reserved.
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