Charge transport and electrochemical response of poly(3,4- ethylenedioxypyrrole) films improved by noble-metal nanoparticles

M, Deepa and Kharkwal, A and Joshi, A G and Srivastava, A K (2011) Charge transport and electrochemical response of poly(3,4- ethylenedioxypyrrole) films improved by noble-metal nanoparticles. Journal of Physical Chemistry B, 115 (22). pp. 7321-7331. ISSN 1520-6106

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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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Item Type: Article
Uncontrolled Keywords: Absorption coefficients; Ag nanoparticle; Charge-carrier mobility; Coloration efficiencies; Device application; Diffusion rate; Donor density; Electrochemical activities; Electrochemical charge; Electrochemical response; Electrochemical switching; Electrochromic switching; High voltage; Low voltages; Noble metal nanoparticles; Optical study; Redox switching; Room temperature; Space-charge-limited current; Valence band spectra
Subjects: Chemistry
Divisions: Department of Chemistry
Depositing User: Team Library
Date Deposited: 30 Oct 2014 10:09
Last Modified: 18 Oct 2017 09:58
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