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Bringing Conjugated Polymers and Oxide Nanoarchitectures into Intimate Contact: Light-Induced Electrodeposition of Polypyrrole and Polyaniline on Nanoporous WO3 or TiO2 Nanotube Array
journal contribution
posted on 2012-09-13, 00:00 authored by Csaba Janáky, Norma R. de Tacconi, Wilaiwan Chanmanee, Krishnan RajeshwarThis proof-of-concept study focuses on the photocatalytic
electrodeposition
of two conducting polymers, namely, polyaniline (PANI) and polypyrrole
(PPy), in two different nanostructured inorganic semiconductor host
matrices, namely, nanoporous tungsten trioxide and nanotubular titanium
dioxide. Oxide semiconductor (WO3 and TiO2)
films were initially electrosynthesized on tungsten and titanium foils,
respectively, by anodization at different voltages in fluoride-containing
aqueous media. The conjugated polymer was electrografted onto the
entire surface of the photoexcited oxide semiconductor matrix using
potentiostatic and potentiodynamic deposition methods. The crucial
role of initial photoelectrochemical deposition, preceding the electrochemical
polymerization step, was demonstrated. The photoelectrodeposited and
electrodeposited hybrid samples were compared from both morphological
and electrochemical perspectives. Importantly, through application
of the methodology presented in this article, deposition of electroactive
polymers can be achieved homogenously, on both macroscale and nanoscale
dimensions. The morphology and structural properties of these assemblies
were evaluated by FE-SEM, ATR FT-IR, and Raman spectroscopy, whereas
their electroactivity was characterized by cyclic voltammetry.
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Intimate Contactelectrochemical perspectivesnanoporous tungsten trioxidephotoexcited oxide semiconductor matrixphotoelectrochemical depositionNanoporous WO 3electroactive polymersRaman spectroscopyphotocatalytic electrodepositioncyclic voltammetryBringing Conjugated Polymerssemiconductor host matricesATRnanoscale dimensionselectrochemical polymerization steppotentiodynamic deposition methodsWO 3Oxide Nanoarchitecturesnanotubular titanium dioxideTiOOxide semiconductorPANItitanium foils
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