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    Formation of adherent polypyrrole coatings on Ti and Ti–6Al–4V alloy


    Earley, Sean T. and Dowling, Dennis P. and Lowry, John P. and Breslin, Carmel B. (2005) Formation of adherent polypyrrole coatings on Ti and Ti–6Al–4V alloy. Synthetic Metals, 148 (2). pp. 111-118. ISSN 0379-6779

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    Abstract

    Highly adherent polypyrrole coatings were electrodeposited at etched Ti and Ti–6Al–4V from 0.2 M oxalic acid and 0.2 M pyrrole at a constant applied potential of 0.8 V versus SCE. The substrates were etched in an alkaline peroxide solution at ambient temperature for a 10 min period prior to the electropolymerization reactions. Chemical etching of the substrate gave rise to an increase in the hydrophilicity of the surface, the formation of a micro-etched surface and the formation of a semiconducting titanium oxide film. There was a considerable increase in the density of nucleation sites for polypyrrole growth at the micro-etched surface. Growth of the polypyrrole proceeded slowly from a high number of nucleation sites at the etched surface to give rise to a highly adherent polypyrrole coating. Adhesion of the polypyrrole coating was attributed to micro-etching of the substrate and the conductivity of the oxide film generated during the chemical etching process.

    Item Type: Article
    Keywords: Titanium; Polypyrrole; Implant; Adhesion; Electropolymerization;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 7925
    Identification Number: https://doi.org/10.1016/j.synthmet.2004.09.020
    Depositing User: Dr. Carmel Breslin
    Date Deposited: 15 Feb 2017 16:39
    Journal or Publication Title: Synthetic Metals
    Publisher: Elsevier B.V.
    Refereed: Yes
    Funders: Health Research Board (HRB)
    URI:

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