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Journal of Nanomaterials
Volume 2017, Article ID 5176481, 8 pages
https://doi.org/10.1155/2017/5176481
Research Article

PEDOT:PSS Nanofilms Fabricated by a Nonconventional Coating Method for Uses as Transparent Conducting Electrodes in Flexible Electrochromic Devices

1The Joint Graduate School of Energy and Environment, Centre of Excellence on Energy Technology and Environment, King Mongkut’s University of Technology Thonburi (KMUTT), 126 Pracha Uthit Rd., Bangmod, Tungkru, Bangkok 10140, Thailand
2Nanoscience and Nanotechnology Graduate Program, King Mongkut’s University of Technology Thonburi (KMUTT), 126 Pracha Uthit Rd., Bangmod, Tungkru, Bangkok 10140, Thailand
3National Nanotechnology Center, National Science and Technology Development Agency, 111 Thailand Science Park, Phahonyothin Rd., Khlong Nueng, Khlong Luang, Pathumthani 12120, Thailand

Correspondence should be addressed to Surawut Chuangchote; ht.ca.ttumk@uhc.tuwarus

Received 23 September 2016; Accepted 16 November 2016; Published 22 January 2017

Academic Editor: Shiren Wang

Copyright © 2017 Kanyanee Sanglee et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Nanofilms of a polymer mixer of two ionomers, poly 3,4-ethylenedioxythiophene:poly(styrene sulfonic acid) (PEDOT:PSS), were used as conducting materials to develop transparent conducting electrodes. It was firstly found that convective deposition, a versatile and wide-area coating method, could be used for the coating and acid treatment of PEDOT:PSS films. Electrical conductivity of the PEDOT:PSS films was significantly enhanced up to 1814 S/cm by only one-time surface treatment by a mild acid solution (4 M methanesulfonic acid). This is because some PSS chains were removed out from the polymer mixer films without damage on the substrates. UV-vis-NIR spectroscopy, Raman spectroscopy, and cyclic voltammetry were used to characterize the acid-treated transparent conducting films. In this report, obtained transparent conducting PEDOT:PSS films on polyester substrates were used as flexible electrodes for fabrication of flexible electrochromic devices. Poly(3-hexylthiophene) (P3HT) was used as an active layer, which its color changed reversibly from transparent-light blue to purple with a small applied voltage (±3 V).