Bhandari, Shweta and M. , Deepa and Srivastava, A. K. and Lakshmikumar, S. T. and -, Ramakant (2009) Electrochromic Contrast Enhancement of Nanostructured Poly(3,4-ethylenedioxythiophene)-Polystyrene Sulfonate Films by Composition/Morphology Control. Journal of Nanoscience and Nanotechnology, 9 (5). pp. 3052-3061. ISSN 1533-4880

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Poly(3,4-ethylenedioxythiophene) (PEDOT) films have been electropolymerized from an aqueous micellar polyethylene glycol (PEG) based solution containing sodium poly(styrenesulfonate) (NaPSS) and lithium trifluoromethanesulfonate. On varying the NaPSS content in the electrode-position bath, two strikingly different nanostructured morphologies were obtained for ensuing PEDOT:PSS films and these have been correlated to the electrochemical and optical performance of the films. The films grown from the formulation with EDOT:NaPSS in a 1:3 weight ratio comprise of a nanoparticulate structure with a to date scarcely reported hexagonal structure. The film surface is also characterized by some unusual floral shapes encompassing elongated grains. TEM studies reveal that in the 1:3 film two dimensional (planar) PEDOT chains are stacked on top of each other with a vertical separation of 4.63 Å. On the other hand the film generated from a 1:1 solution shows a texture wherein a random segregation of PSS particles is seen and this adversely affects the electrochromic response of the film. The larger charge storage capacity (4.9 mC cm−2), better charge reversibility during coloration and bleaching, good electrochemical cycling stability up to 2500 cycles, higher electronic conductivity and a superior coloration efficiency of 233 cm2 C−1 at a photopic wavelength of 550 nm under ion intercalation levels of 0.058 to 1.2 mC cm−2 shown by 1:3 film as compared to the performance of the 1:1 film are ramifications of fast ion movement promoted by the novel microstructure and the hexagonal modification which has rarely been achieved in PEDOT:PSS films.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s American Scientific Publishers
Subjects: Chemistry
Materials Science
Depositing User: Ms Neetu Chandra
Date Deposited: 27 Aug 2012 09:15
Last Modified: 27 Aug 2012 09:25

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