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ACS applied materials & interfaces v.9 no.2, 2017년, pp.1770 - 1780   SCI SCIE
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Highly Stretchable, Hysteresis-Free Ionic Liquid-Based Strain Sensor for Precise Human Motion Monitoring

Choi, Dong Yun (Powder and Ceramics Division, Korea Institute of Materials and Science, Changwondaero 797, Seongsan-gu, Changwon 51508, ) ; Kim, Min Hyeong (Powder and Ceramics Division, Korea Institute of Materials and Science, Changwondaero 797, Seongsan-gu, Changwon 51508, ) ; Oh, Yong Suk (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daehak-ro 291, Yuseong-gu, Daejeon 34141, ) ; Jung, Soo-Ho (Powder and Ceramics Division, Korea Institute of Materials and Science, Changwondaero 797, Seongsan-gu, Changwon 51508, ) ; Jung, Jae Hee (Center for Environment, Health, and Welfare Research, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, ) ; Sung, Hyung Jin (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daehak-ro 291, Yuseong-gu, Daejeon 34141, ) ; Lee, Hyung Woo (Department of Nano Energy Engineering, Pusan National University, Busandaehak-ro 63beon-gil 2, Geumjeong-gu, Busan 46241, ) ; Lee, Hye Moon (Powder and Ceramics Division, Korea Institute of Materials and Science, Changwondaero 797, Seong ) ;
  • 초록  

    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.


  • 주제어

    stretchable sensor .   strain sensor .   human motion detection .   ionic liquid .   viscoelastic effect.  

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