Gray to transmissive electrochromic switching based on electropolymerized PEDOT-ionic liquid functionalized graphene films

Siju, CR and Raja, L and Shivaprakash, NC and Sindhu, S (2015) Gray to transmissive electrochromic switching based on electropolymerized PEDOT-ionic liquid functionalized graphene films. In: JOURNAL OF SOLID STATE ELECTROCHEMISTRY, 19 (5). pp. 1393-1402.

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Abstract

A supporting electrolyte based on lithium perchlorate has been functionalized with graphene (ionic liquid functionalized graphene (IFGR)) by facile electrochemical exfoliation of graphite rods in aq. LiClO4 solution. Poly(3,4-ethylenedioxythiophene) (PEDOT)-IFGR films were prepared by electropolymerization of EDOT monomer with IFGR as supporting electrolyte in ethanol at static potential of 1.5 V. The Raman, SEM, and XPS analysis of PEDOT-IFGR film confirmed the presence of functionalized graphene in the film. The PEDOT-IFGR films showed good electrochemical properties, better ionic and electrical conductivity, significant band gap, and excellent spectroelectrochemical and electrochromic properties. The electrical conductivity of PEDOT-IFGR film was measured as about 3968 S cm(-1). PEDOT-IFGR films at reduced state showed strong and broad absorption in the whole visible region and remarkable absorption at near-IR region. PEDOT-IFGR film showed electrochromic response between transmissive blue and darkish gray at redox potential. The color contrast (%T) between fully reduced and oxidized states of PEDOT-IFGR film is 25 % at lambda (max) of 485 nm. The optical switching stability of PEDOT-IFGR film has retained 80 % of its electroactivity even after 500 cycles.

Item Type:	Journal Article
Publication:	JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Publisher:	SPRINGER
Additional Information:	Copy right for this article belongs to the SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA
Keywords:	Poly(3,4-ethylenedioxythiophene); Exfoliation; Graphene; Electrochromism
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	22 May 2015 07:19
Last Modified:	22 May 2015 07:19
URI:	http://eprints.iisc.ac.in/id/eprint/51556

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