Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 37, Pages 34305-34315Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b10575
Keywords
poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS); piezoresistive; pressure sensor; graphene oxide; miniaturization; current crowding; flexible electronics; biomedicine
Funding
- Ministry of Science and Technology, R.O.C [MOST 107-2218-E-182-007, MOST 108-2218-E-182-003]
- Chang Gung Memorial Hospital, Linkou, Taiwan [CMRPD2F0123, CMRPD2H0131, BMRPA74]
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Piezoresistive pressure sensors have garnered significant attention because of their wide applications in automobiles, intelligent buildings, and biomedicine. For in vivo testing, the size of pressure sensors is a vital factor to monitor the pressure of specific portions of a human body. Therefore, the primary focus of this study is to miniaturize piezoresistive pressure sensors with graphene oxide (GO)-incorporated poly(3,4-ethylenedioxythiophene) :poly(styrenesulfonate) (PEDOT:PSS) composite films on a flexible substrate for biomedical applications. Prior to the fabrication of pressure sensors, a comprehensive material analysis was applied to identify the horizontal placement of GO flakes within the PEDOT:PSS copolymers, revealing a reduction in variable range hopping distance and an enhancement in carrier mobility. For devices scaled to 0.2 cm, the sensitivity of PEDOT:PSS pressure sensors was conspicuously decreased owing to the late response, which can be effectively solved by GO incorporation. Using technology computer-aided design simulations, the current crowded at the PEDOT:PSS film surface and in the vicinity of an indium-tin-oxide electrode corner was found to be responsible for the changes in piezoresistive behaviors of the scaled devices. The miniaturized flexible piezoresistive pressure sensors with PEDOT:PSS/GO composite films are capable of monitoring the brain pressure of intracranial surgery of a rat and discerning different styles of music for a potential application in hearing aids.
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