TY - JOUR
T1 - Highly sensitive pressure and temperature sensors fabricated with poly(3-hexylthiophene-2,5-diyl)-coated elastic carbon foam for bio-signal monitoring
AU - Jang, Gwon Neung
AU - Hong, Soo Yeong
AU - Park, Heun
AU - Lee, Yong Hui
AU - Park, Hyojin
AU - Lee, Hanchan
AU - Jeong, Yu Ra
AU - Jin, Sang Woo
AU - Keum, Kayeon
AU - Ha, Jeong Sook
N1 - Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (Grant No. NRF-2019R1A2B5B03069545). The authors also thank the KU-KIST graduate school program of Korea University.
Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (Grant No. NRF-2019R1A2B5B03069545). The authors also thank the KU-KIST graduate school program of Korea University.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/11/1
Y1 - 2021/11/1
N2 - 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.
AB - 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.
KW - Bio-signal
KW - Dual-mode sensor
KW - P3HT-coated elastic carbon foam
KW - Pressure sensor
KW - Temperature sensor
UR - http://www.scopus.com/inward/record.url?scp=85105429224&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2021.130197
DO - 10.1016/j.cej.2021.130197
M3 - Article
AN - SCOPUS:85105429224
SN - 1385-8947
VL - 423
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 130197
ER -