title: Highly Stretchable, Hysteresis-Free Ionic Liquid-Based Strain Sensor for Precise Human Motion Monitoring.
abstract: A highly stretchable, low-cost strain sensor was successfully prepared using an extremely cost-effective ionic liquid of ethylene glycol/sodium chloride. The hysteresis performance of the ionic-liquid-based sensor was able to be improved by introducing a wavy-shaped fluidic channel diminishing the hysteresis by the viscoelastic relaxation of elastomers. From the simulations on visco-hyperelastic behavior of the elastomeric channel, we demonstrated that the wavy structure can offer lower energy dissipation compared to a flat structure under a given deformation. The resistance response of the ionic-liquid-based wavy (ILBW) sensor was fairly deterministic with no hysteresis, and it was well-matched to the theoretically estimated curves. The ILBW sensors exhibited a low degree of hysteresis (0.15% at 250%), low overshoot (1.7% at 150% strain), and outstanding durability (3000 cycles at 300% strain). The ILBW sensor has excellent potential for use in precise and quantitative strain detections in various areas, such as human motion monitoring, healthcare, virtual reality, and smart clothes.
authors.affiliation: Powder and Ceramics Division, Korea Institute of Materials and Science , Changwondaero 797, Seongsan-gu, Changwon 51508, Korea.
authors.forename: Dong Yun
authors.initials: DY
authors.lastname: Choi
authors.affiliation: Powder and Ceramics Division, Korea Institute of Materials and Science , Changwondaero 797, Seongsan-gu, Changwon 51508, Korea.|Department of Nano Energy Engineering, Pusan National University , Busandaehak-ro 63beon-gil 2, Geumjeong-gu, Busan 46241, Korea.
authors.forename: Min Hyeong
authors.initials: MH
authors.lastname: Kim
authors.affiliation: Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology , Daehak-ro 291, Yuseong-gu, Daejeon 34141, Korea.
authors.forename: Yong Suk
authors.initials: YS
authors.lastname: Oh
authors.affiliation: Powder and Ceramics Division, Korea Institute of Materials and Science , Changwondaero 797, Seongsan-gu, Changwon 51508, Korea.
authors.forename: Soo-Ho
authors.initials: SH
authors.lastname: Jung
authors.affiliation: Center for Environment, Health, and Welfare Research, Korea Institute of Science and Technology , Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Korea.
authors.forename: Jae Hee
authors.initials: JH
authors.lastname: Jung
authors.affiliation: Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology , Daehak-ro 291, Yuseong-gu, Daejeon 34141, Korea.
authors.forename: Hyung Jin
authors.identifier: http://orcid.org/0000-0002-4671-3626
authors.initials: HJ
authors.lastname: Sung
authors.affiliation: Department of Nano Energy Engineering, Pusan National University , Busandaehak-ro 63beon-gil 2, Geumjeong-gu, Busan 46241, Korea.
authors.forename: Hyung Woo
authors.initials: HW
authors.lastname: Lee
authors.affiliation: Powder and Ceramics Division, Korea Institute of Materials and Science , Changwondaero 797, Seongsan-gu, Changwon 51508, Korea.
authors.forename: Hye Moon
authors.identifier: http://orcid.org/0000-0001-6719-5613
authors.initials: HM
authors.lastname: Lee
mesh_terms: D004548:Elasticity; D020724:Elastomers; D006801:Humans; D052578:Ionic Liquids / Q000737:chemistry*; D007477:Ions; D009038:Motion
chemical_list: D020724:Elastomers; D052578:Ionic Liquids; D007477:Ions
keywords: human motion detection; ionic liquid; strain sensor; stretchable sensor; viscoelastic effect