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 λ max of 485 nm. The optical switching stability of PEDOT-IFGR film has retained 80 % of its electroactivity even after 500 cycles.
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Acknowledgments
The authors would like to thank the Department of Science and Technology, Government of India, for financial support. The authors are grateful to Mr. Sangeeth K, CeNSE, Indian Institute of Science (IISc), India, for SEM analysis and Mr. Rajesh Thomas, Department of Instrumentation and Applied Physics, IISc, India, for XPS characterizations.
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Siju, C.R., Raja, L., Shivaprakash, N.C. et al. Gray to transmissive electrochromic switching based on electropolymerized PEDOT-ionic liquid functionalized graphene films. J Solid State Electrochem 19, 1393–1402 (2015). https://doi.org/10.1007/s10008-015-2756-4
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DOI: https://doi.org/10.1007/s10008-015-2756-4