title: Micropatterned Pyramidal Ionic Gels for Sensing Broad-Range Pressures with High Sensitivity.
abstract: The development of pressure sensors that are effective over a broad range of pressures is crucial for the future development of electronic skin applicable to the detection of a wide pressure range from acoustic wave to dynamic human motion. Here, we present flexible capacitive pressure sensors that incorporate micropatterned pyramidal ionic gels to enable ultrasensitive pressure detection. Our devices show superior pressure-sensing performance, with a broad sensing range from a few pascals up to 50 kPa, with fast response times of <20 ms and a low operating voltage of 0.25 V. Since high-dielectric-constant ionic gels were employed as constituent sensing materials, an unprecedented sensitivity of 41 kPa-1in the low-pressure regime of <400 Pa could be realized in the context of a metal-insulator-metal platform. This broad-range capacitive pressure sensor allows for the efficient detection of pressure from a variety of sources, including sound waves, a lightweight object, jugular venous pulses, radial artery pulses, and human finger touch. This platform offers a simple, robust approach to low-cost, scalable device design, enabling practical applications of electronic skin.
authors.affiliation: Department of Materials Science and Engineering and ‡School of Mechanical Engineering, Yonsei University Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea.
authors.forename: Sung Hwan
authors.initials: SH
authors.lastname: Cho
authors.affiliation: Department of Materials Science and Engineering and ‡School of Mechanical Engineering, Yonsei University Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea.
authors.forename: Seung Won
authors.initials: SW
authors.lastname: Lee
authors.affiliation: Department of Materials Science and Engineering and ‡School of Mechanical Engineering, Yonsei University Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea.
authors.forename: Seunggun
authors.initials: S
authors.lastname: Yu
authors.affiliation: Department of Materials Science and Engineering and ‡School of Mechanical Engineering, Yonsei University Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea.
authors.forename: Hyeohn
authors.initials: H
authors.lastname: Kim
authors.affiliation: Department of Materials Science and Engineering and ‡School of Mechanical Engineering, Yonsei University Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea.
authors.forename: Sooho
authors.initials: S
authors.lastname: Chang
authors.affiliation: Department of Materials Science and Engineering and ‡School of Mechanical Engineering, Yonsei University Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea.
authors.forename: Donyoung
authors.initials: D
authors.lastname: Kang
authors.affiliation: Department of Materials Science and Engineering and ‡School of Mechanical Engineering, Yonsei University Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea.
authors.forename: Ihn
authors.initials: I
authors.lastname: Hwang
authors.affiliation: Department of Materials Science and Engineering and ‡School of Mechanical Engineering, Yonsei University Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea.
authors.forename: Han Sol
authors.initials: HS
authors.lastname: Kang
authors.affiliation: Department of Materials Science and Engineering and ‡School of Mechanical Engineering, Yonsei University Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea.
authors.forename: Beomjin
authors.initials: B
authors.lastname: Jeong
authors.affiliation: Department of Materials Science and Engineering and ‡School of Mechanical Engineering, Yonsei University Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea.
authors.forename: Eui Hyuk
authors.initials: EH
authors.lastname: Kim
authors.affiliation: Department of Materials Science and Engineering and ‡School of Mechanical Engineering, Yonsei University Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea.
authors.forename: Suk Man
authors.initials: SM
authors.lastname: Cho
authors.affiliation: Department of Materials Science and Engineering and ‡School of Mechanical Engineering, Yonsei University Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea.
authors.forename: Kang Lib
authors.initials: KL
authors.lastname: Kim
authors.affiliation: Department of Materials Science and Engineering and ‡School of Mechanical Engineering, Yonsei University Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea.
authors.forename: Hyungsuk
authors.initials: H
authors.lastname: Lee
authors.affiliation: Department of Materials Science and Engineering and ‡School of Mechanical Engineering, Yonsei University Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea.
authors.forename: Wooyoung
authors.identifier: http://orcid.org/0000-0002-7601-6282
authors.initials: W
authors.lastname: Shim
authors.affiliation: Department of Materials Science and Engineering and ‡School of Mechanical Engineering, Yonsei University Yonsei-ro 50, Seodaemun-gu, Seoul 03722, Republic of Korea.
authors.forename: Cheolmin
authors.identifier: http://orcid.org/0000-0002-6832-0284
authors.initials: C
authors.lastname: Park
keywords: arrays of periodic pyramids; broad range pressure sensing; capacitive pressure sensor; health monitoring; high sensitivity; ionic polymer gels; topographical micropattern