Multi-modal strain and temperature sensor by hybridizing reduced graphene oxide and PEDOT:PSS

Fan Zhang, Hailong Hu, Mohammad Islam, Shuhua Peng, Shuying Wu, Sean Lim, Yang Zhou, Chun Hui Wang*

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Mechanically stretchable sensors are responsive to multiple stimuli, such as strain and temperature, making it difficult to identify individual stimulus using a single senor. Herein, we present a hybrid sensor featuring dissimilar impedance frequency-responses under different stimuli. The sensor is made by infusing polydimethylsiloxane (PDMS) into an aerogel containing a hybrid of conductive materials consisting of PEDOT:PSS and reduced graphene oxide. Exhibiting positive and negative sensitivity to strain and temperature, respectively, this sensor makes it possible to determine both stimuli using an impedance method. By measuring the sensor's electrical impedance at two different frequencies, both strain and temperature can be readily determined using just one sensor. Test results under long-term cyclic loading confirm that the hybrid sensor also retains high sensitivity, stretchability, and cyclic stability. The new impedance method used in conjunction with the hybrid sensor enable simultaneous determination of multiple stimuli, such as strain and temperature.

Original languageEnglish
Article number107959
Pages (from-to)1-11
Number of pages11
JournalComposites Science and Technology
Volume187
DOIs
Publication statusPublished - 8 Feb 2020

Keywords

  • Multi-modal sensor
  • Piezoresistive performance
  • Temperature-sensing properties
  • PEDOT:PSS/reduced graphene oxide aerogels
  • Dual-frequency impedance method

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