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Applications of Polymer, Composite, and Coating Materials
Highly conductive, stretchable and transparent PEDOT:PSS electrodes fabricated with triblock copolymer additives and acid treatment Jin Ho Lee, Yu Ra Jeong, Geumbee Lee, Sang Woo Jin, Yong Hui Lee, Soo Yeong Hong, Heun Park, Jung Wook Kim, Sang-Soo Lee, and Jeong Sook Ha ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.8b07287 • Publication Date (Web): 26 Jul 2018 Downloaded from http://pubs.acs.org on July 26, 2018
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ACS Applied Materials & Interfaces
Highly Conductive, Stretchable and Transparent PEDOT:PSS Electrodes Fabricated with Triblock Copolymer Additives and Acid Treatment Jin Ho Lee1, Yu Ra Jeong2, Geumbee Lee1, Sang Woo Jin1, Yong Hui Lee2, Soo Yeong Hong2, Heun Park2, Jung Wook Kim2, Sang-Soo Lee1,3 and Jeong Sook Ha1, 2, * 1
KU-KIST Graduate School of Converging Science and Technology, Korea University, 145
Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea 2
Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro,
Seongbuk-gu, Seoul 02841, Republic of Korea 3
Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology,
Seoul, Republic of Korea
*Corresponding author. Tel.: +82-2-3290-3303. E-mail:
[email protected] (Jeong Sook Ha)
KEYWORDS. Stretchable transparent electrode, PEDOT:PSS, Triblock copolymer, Sulfuric acid treatment, Stretchable electronics
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ABSTRACT.
We report on a highly conductive, stretchable and transparent electrode of poly(3,4 ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) fabricated via modification with triblock copolymer, poly(ethylene glycol)–block–poly(propylene glycol)–block– poly(ethylene glycol) (PEO20–PPO70–PEO20, Pluronic® P123) and post-treatment with sulfuric acid. The fabricated electrode exhibits high transparency (89%), high electrical conductivity (~1,700 S/cm), and minimal change in resistance (~4%) under repetitive stretch– release cycles at 40% tensile strain after stabilization. P123 acts as a secondary dopant and plasticizer, resulting in enhanced electrical conductivity and stretchability of PEDOT:PSS. Furthermore, after sulfuric acid post treatment, P123 helps the electrode to maintain its stretchability. A successful demonstration of the stretchable interconnection was shown by stretching the P123 modified PEDOT:PSS electrodes which were connected with lightemitting diodes (LEDs) in serial. Finally, a stretchable and transparent touch sensor consisting of our fabricated electrodes and an LED array and stretchable semi-transparent supercapacitor were presented, suggesting a great potential of our electrodes in the application to various deformable devices.
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ACS Applied Materials & Interfaces
1. INTRODUCTION With the increasing demand for wearable healthcare monitoring systems and the development of related industries, research on electronic systems that can interact with the human body has gained traction. Considerable efforts have been made to develop materials that are mechanically and electrically stable under various deformations in accordance with body movements.1 Stretchable transparent electrodes are one of the fundamental elements of deformable electrical devices, since they themselves are useful and are essential in various optical displays2-3 and photovoltaic devices.4-6 Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is the most widely used conductive polymer owing to its thermoelectric properties7-8, electrical conductivity, transparency, and solution processability. PEDOT is a hydrophobic conjugated polymer, and its hydrophilic PSS segment counterpart disperses PEDOT into aqueous solutions. However, the pristine PEDOT:PSS thin film is sensitive to humidity9 and critically it has limited electrical conductivity (
