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Journal of Nanomaterials
Volume 2017 (2017), Article ID 1489186, 6 pages
Research Article

PEDOT:PSS Overcoating Layer for Mechanically and Chemically Stable Ag Nanowire Flexible Transparent Electrode

1BASF Electronic Materials R&D Center Asia, Suwon 16419, Republic of Korea
2Graduate School of Flexible and Printable Electronics, Chonbuk National University, Jeonju 54896, Republic of Korea

Correspondence should be addressed to Sooman Lim

Received 22 January 2017; Revised 5 March 2017; Accepted 12 March 2017; Published 6 April 2017

Academic Editor: Albert Nasibulin

Copyright © 2017 Byungil Hwang and Sooman Lim. 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.


We investigated the effect of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) deposition on the chemical and mechanical stability of Ag nanowire flexible electrodes. A large number of bending cycles, up to 500,000 cycles, were imposed on the Ag nanowire electrodes with and without PEDOT:PSS overcoating layer. In situ resistance measurement during bending tests revealed that the Ag nanowire electrode with PEDOT:PSS overcoating layer was mechanically reliable, showing a 21.9% increase in resistance after 500,000 cycles of bending. Scanning electron microscope images revealed that the failure of the Ag nanowire network occurred along with cracks initiated in the PEDOT:PSS layer, which resulted in the increase in resistance under bending. Furthermore, the PEDOT:PSS deposition enhanced the chemical stability of Ag nanowire electrode, which showed no significant increase in resistance after exposure in air for 50 days. Our study underscored that PEDOT:PSS is effective in protecting the Ag nanowires, while maintaining the high mechanical stability.