Miniaturized Flexible Piezoresistive Pressure Sensors: Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) Copolymers Blended with Graphene Oxide for Biomedical Applications

Jer Chyi Wang*, Rajat Subhra Karmakar, Yu Jen Lu, Shun Hsiang Chan, Ming Chung Wu, Kun Ju Lin, Chin Kuo Chen, Kuo Chen Wei, Yung Hsin Hsu

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

35 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)34305-34315
Number of pages11
JournalACS Applied Materials and Interfaces
Volume11
Issue number37
DOIs
StatePublished - 18 09 2019

Bibliographical note

Publisher Copyright:
Copyright © 2019 American Chemical Society.

Keywords

  • biomedicine
  • current crowding
  • flexible electronics
  • graphene oxide
  • miniaturization
  • piezoresistive
  • poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)
  • pressure sensor

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