Microporous Polypyrrole-Coated Graphene Foam for High-Performance Multifunctional Sensors and Flexible Supercapacitors

Heun Park, Jung Wook Kim, Soo Yeong Hong, Geumbee Lee, Dong Sik Kim, Ju hyun Oh, Sang Woo Jin, Yu Ra Jeong, Seung Yun Oh, Jun Yeong Yun, Jeong Sook Ha

Research output: Contribution to journalArticlepeer-review

157 Citations (Scopus)


This study reports on the fabrication of pressure/temperature/strain sensors and all-solid-state flexible supercapacitors using only polydimethylsiloxane coated microporous polypyrrole/graphene foam composite (PDMS/PPy/GF) as a common material. A dual-mode sensor is designed with PDMS/PPy/GF, which measures pressure and temperature with the changes of current and voltage, respectively, without interference to each other. The fabricated dual-mode sensor shows high sensitivity, fast response/recovery, and high durability during 10 000 cycles of pressure loading. The pressure is estimated using the thermoelectric voltage induced by simultaneous increase in temperature caused by a finger touch on the sensor. Additionally, a resistor-type strain sensor fabricated using the same PDMS/PPy/GF could detect the strain up to 50%. Flexible, high performance supercapacitor used as a power supply is fabricated with electrodes of PPy/GF for its high surface area and pseudocapacitance. Furthermore, an integrated system of such fabricated multifunctional sensors and a supercapacitor on a skin-attachable flexible substrate using liquid–metal interconnections operates well, whereas sensors are driven by the power of the supercapacitor. This study clearly demonstrates that the appropriate choice of a single functional material enables fabrication of active multifunctional sensors for pressure, temperature, and strain, as well as the supercapacitor, that could be used in wirelessly powered wearable devices.

Original languageEnglish
Article number1707013
JournalAdvanced Functional Materials
Issue number33
Publication statusPublished - 2018 Aug 15


  • integrated system
  • multifunctional sensors
  • polypyrrole-coated graphene foam
  • supercapacitors
  • wireless powering

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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