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Kang, Seok Ju
Smart Materials for Energy Lab
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  • Metal-Oxygen battery, low dimensional materials, organic flexible memory, organic solar cell

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Enhancing the conductivity of PEDOT:PSS films for biomedical applications via hydrothermal treatment

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Title
Enhancing the conductivity of PEDOT:PSS films for biomedical applications via hydrothermal treatment
Author
Jeong, WooseongGwon, GihyeokHa, Jae-HyunKim, DonghaEom, Ki-JooPark, Ju HyangKwak, BongseopKang, Seok JuHong, Jung-IlLee, ShinbuhmHyun, Dong ChoonLee, Sungwon
Issue Date
2021-01
Publisher
Pergamon Press Ltd.
Citation
BIOSENSORS & BIOELECTRONICS, v.171, pp.112717
Abstract
This paper reports a new biocompatible conductivity enhancement of poly (3,4-ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) films for biomedical applications. Conductivity of PEDOT:PSS layer was reproducibly from 0.495 to 125.367 S cm−1 by hydrothermal (HT) treatment. The HT treatment employs water (relative humidity > 80%) and heat (temperature > 61 °C) instead of organic solvent doping and post-treatments, which can leave undesirable residue. The treatment can be performed using the sterilizing conditions of an autoclave. Additionally, it is possible to simultaneously reduce the electrical resistance, and sterilize the electrode for practical use. The key to conductivity enhancement was the structural rearrangement of PEDOT:PSS, which was determined using atomic force microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and ultraviolet–visible spectroscopy. It was found that PEDOT inter-bridging occurred as a result of the structural rearrangement. Therefore, the conductivity increased on account of the continuous conductive pathways of the PEDOT chains. To test the biocompatible enhancement technique for biomedical applications, certain demonstrations, such as the monitoring of joint movements and skin temperature, and measuring electrocardiogram signals were conducted with the hydrothermal-treated PEDOT:PSS electrode. This simple, biocompatible treatment exhibited significant potential for use in other biomedical
URI
https://scholarworks.unist.ac.kr/handle/201301/48256
URL
https://www.sciencedirect.com/science/article/pii/S0956566320307053
DOI
10.1016/j.bios.2020.112717
ISSN
0956-5663
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