Highly sensitive pressure and temperature sensors fabricated with poly(3-hexylthiophene-2,5-diyl)-coated elastic carbon foam for bio-signal monitoring

Gwon Neung Jang, Soo Yeong Hong, Heun Park, Yong Hui Lee, Hyojin Park, Hanchan Lee, Yu Ra Jeong, Sang Woo Jin, Kayeon Keum, Jeong Sook Ha

Research output: Contribution to journalArticlepeer-review

Abstract

In this report, high sensitivity pressure and temperature sensors are demonstrated based on a single common active material of poly(3-hexylthiophene-2,5-diyl) (P3HT)-coated elastic carbon foam (ECF) for bio-signal monitoring. A conductive microporous elastic foam is obtained via direct carbonization of a commercially available melamine foam at 700 °C and a subsequent dip coating with P3HT. The design incorporating interdigitated electrodes on the bottom of the P3HT-coated ECF is used to fabricate a high-performance pressure sensor with a high pressure sensitivity of 102.4 kPa−1 (<1 kPa), fast response time of 50 ms, and high cyclic durability over 10,000 repetitive pressure loading/unloading cycles. After attachment of the pressure sensor onto the skin, bio-signals such as arterial pulse, swallowing, and voice are distinctively detected. Owing to the thermoelectric property of P3HT, the fabricated temperature sensor shows a high sensitivity of 82.5 μV/K in the range near body temperature between 25 and 55 °C. As a result, distinctive skin temperatures at hand, brow, and neck are measured while attached onto the skin. With an integrated patch of both sensors, the simultaneous detection of critical bio-signals of pulses and skin temperature is accomplished. Furthermore, a dual-mode sensor with a sandwich-type structure enables the detection of pressure by using the thermoelectric voltage generated by the temperature gradient. This work demonstrates a high potential application of our fabricated sensors to skin-attachable wearable devices for bio-signal monitoring.

Original languageEnglish
Article number130197
JournalChemical Engineering Journal
Volume423
DOIs
Publication statusPublished - 2021 Nov 1

Keywords

  • Bio-signal
  • Dual-mode sensor
  • P3HT-coated elastic carbon foam
  • Pressure sensor
  • Temperature sensor

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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