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Relaxation phenomena and structural modifications of substituted polythiophenes during the p-doping processes: an electrochemical and morphological study

Pigani, Laura and Seeber, Renato and Terzi, Fabio and Cerri, Omar and Innocenti, Massimo and Udisti, Roberto and Sanna, Gavino (2006) Relaxation phenomena and structural modifications of substituted polythiophenes during the p-doping processes: an electrochemical and morphological study. Electrochimica Acta, Vol. 51 (13), p. 2698-2705. ISSN 0013-4686. Article.

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DOI: 10.1016/j.electacta.2005.08.018

Abstract

Electrodes modified by polythiophenes bearing different substituents have been prepared and the behaviour of the conducting polymers has been studied with respect to the structural phenomena occurring in the correspondence to the doping and the relevant undoping processes. The effects of experimental parameters, such as undoping potential and time, have been investigated. The steric hindrance of the substituents on the polymer chain is demonstrated to play a fundamental role in determining the extent of compactness of the film, as induced by polarisation of the electrode at potentials at which the previously charged polymer is neutralised. Such a conclusion is in accordance with prediction of the electrochemical stimulated conformational relaxation model. Electrochemical AFM measurements have been performed in order to acquire a direct view of the morphological modifications of the polymer coatings during the reduction.

Item Type:Article
ID Code:3670
Status:Published
Refereed:Yes
Uncontrolled Keywords:Conducting polymers, polythiophenes, electrochemical stimulated conformational relaxation, morphology, atomic force microscopy
Subjects:Area 03 - Scienze chimiche > CHIM/01 Chimica analitica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:Pergamon / Elsevier
ISSN:0013-4686
Copyright Holders:© 2005 Elsevier
Deposited On:01 Apr 2010 10:25

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