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Adv Mater. 2018 May;30(20):e1706851. doi: 10.1002/adma.201706851. Epub 2018 Mar 30.

An Ultrastable Ionic Chemiresistor Skin with an Intrinsically Stretchable Polymer Electrolyte.

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Department of Chemical and Biomolecular Engineering (BK-21 Plus), Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 305-701, South Korea.
KAIST Institute for the NanoCentury, Daejeon, 305-701, South Korea.
Department of Nano-Structured Materials Research, National NanoFab Center (NNFC), 291 Daehak-ro, Yuseong-gu, Daejeon, 305-338, South Korea.
Department of Chemical Engineering, Hanyang University, Seoul, 04763, South Korea.
Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, 37673, South Korea.
Department of Organic Material Science and Engineering, Pusan National University, Busan, 46241, South Koreaa.
State Key Laboratory of Advanced Welding and Jointing, Harbin Institute of Technology, Harbin, 150001, China.


Ultrastable sensing characteristics of the ionic chemiresistor skin (ICS) that is designed by using an intrinsically stretchable thermoplastic polyurethane electrolyte as a volatile organic compound (VOC) sensing channel are described. The hierarchically assembled polymer electrolyte film is observed to be very uniform, transparent, and intrinsically stretchable. Systematic experimental and theoretical studies also reveal that artificial ions are evenly distributed in polyurethane matrix without microscale phase separation, which is essential for implementing high reliability of the ICS devices. The ICS displays highly sensitive and stable sensing of representative VOCs (including toluene, hexane, propanal, ethanol, and acetone) that are found in the exhaled breath of lung cancer patients. In particular, the sensor is found to be fully operational even after being subjected to long-term storage or harsh environmental conditions (relative humidity of 85% or temperature of 100 °C) or severe mechanical deformation (bending to a radius of curvature of 1 mm, or stretching strain of 100%), which can be an effective method to realize a human-adaptive and skin-attachable biosensor platform for daily use and early diagnosis.


intrinsically stretchable materials; ionic chemiresistor skin; solid-state polymer electrolytes; ultrastable materials; volatile organic compound sensors


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