M. , Deepa and Srivastava, A. K. and Sood, K. N. and Murugan, A. V. (2008) Nanostructured Tungsten Oxide-Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) Hybrid Films: Synthesis, Electrochromic Response, and Durability Characteristics. Journal of The Electrochemical Society, 155 (11). D703-D710 . ISSN 1945-7111

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Nanostructured hybrid thin films of the system tungsten oxide–poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (WO3 –PEDOT:PSS) were synthesized by first forming a tungsten-oxide layer by surfactant-assisted electrochemical method, followed by deposition of a PEDOT:PSS layer. The hybrid-film formation is primarily based on coulombic interactions between the surface hydroxyl groups of tungsten oxide and the positively charged centers on the polymer backbone; this has been confirmed by electron microscopy and X-ray diffraction. High-resolution transmission electron microscopy reveals that the tungsten-oxide host with a monoclinic unit cell resides along with the amorphous domains of PEDOT:PSS. The hybrid film, being a dual electrochrome, exhibits a much larger coloring efficiency (227cm2C−1 at 600nm ), a higher redox activity (larger currents for ion ingress and egress are obtained within the same potential range), and, most importantly, a superior electrochemical cycling stability when compared to the neat polymer film. While the pristine polymer film lifts off irrevocably from the substrate upon 3000cycles of coloring and bleaching, the hybrid film sustains about 5000cycles , albeit with some changes in the nanoparticulate morphology, elemental composition, and development of some new artifacts on the film surface.

Item Type: Article
Subjects: Electrochemistry
Materials Science
Depositing User: Ms Neetu Chandra
Date Deposited: 20 Apr 2015 08:22
Last Modified: 20 Apr 2015 08:22
URI: http://npl.csircentral.net/id/eprint/1110

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