Electrochemical properties of poly3-(ω-4-pyridylalkyl)thiophenes

Wang, Jiaxiong, and Keene, F. Richard (1996) Electrochemical properties of poly3-(ω-4-pyridylalkyl)thiophenes. Journal of Electroanalytical Chemistry, 405 (1-2). pp. 59-70.

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Abstract

Poly[3-(ω-4-pyridylalkyl)thiophenes] (P{{P(n)T}}; n = 2, 5, 7, 9, 11) were prepared on the surfaces of Pt disk electrodes by oxidative electropolymerization of the respective monomers. Scanning electron microscopy and cyclic voltammetry were used to investigate the surface structure and electrochemical properties of the polymer-modified electrodes. Apparent diffusion coefficients Dₐpp for charge transfer in the polymer matrices were measured by chronoamperometry, and revealed a dependency on both the porous structure of the polymers (which is determined by the length of the alkyl chains between thiophene and pyridyl groups), and the nature of the supporting electrolytes. A.c. impedance spectra depended on the doped state of the films and the nature of the supporting electrolytes. In oxidized polymers, the charge transfer processes within the bulk polymers and at interfaces are controlled by both kinetic factors and diffusion, while for the reduced films kinetic factors predominate.

Item ID: 22830
Item Type: Article (Refereed Research - C1)
Keywords: poly[3-(ω-4-pyridylalkyl)thiophenes]; electrochemical properties; plasma-polymerized vinylferrocene; chemically modified electrodes; impedance analysis; polypyrrole films; charge-transport; conducting; polymers; polythiophene films; redox sites; thin-films; poly(thiophenes)
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ISSN: 1873-2569
Date Deposited: 10 Aug 2012 05:38
FoR Codes: 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030207 Transition Metal Chemistry @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%
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