Charge Transport and Electrochemical Response of Poly(3,4-ethylenedioxypyrrole) Films Improved by Noble-Metal Nanoparticles

By Deepa, Melepurath; Kharkwal, Aneeta; Joshi, Amish G. & Srivastava, Avanish Kumar
Published in The Journal of Physical Chemistry B NULL 2011

Abstract

Charge-transport phenomena and redox switching of poly(3,4-ethylenedioxypyrrole) (PEDOP) films embedded with Au and Ag nanoparticles have been investigated. In the bulk, charge transport can be described by an ohmic regime at low voltages and a space-charge-limited current regime at high voltages in PEDOP -Au, which is in contrast to trap-filled domains deduced for neat PEDOP and PEDOP -Ag nanocomposites, all indicating transitions driven by an external bias. This also allowed a direct estimation of a fairly high charge-carrier mobility at room temperature in PEDOP -Au, in addition to a higher donor density, which are advantageous for device applications. X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy affirmed the prevalence of Au/Ag nanoparticles as nonleachable entities in PEDOP, thus allowing the movement of electrons through the conducting nanoaparticles during electrochemical switching, an effect that is absent in the neat PEDOP film. Valence-band spectra and optical studies revealed that nanoparticles narrowed the band gap and increased the absorption coefficient of PEDOP, which enhanced the electrochromic switching ability of PEDOP. A coloration efficiency enhancement by an order of magnitude, higher electrochemical charge intercalation capacity, and higher diffusion rates reflect the role of noble-metal nanoparticles in improving the conduction and electrochemical activity of PEDOP.

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