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Sci Adv. 2019 Nov 8;5(11):eaav3097. doi: 10.1126/sciadv.aav3097. eCollection 2019 Nov.

Stretchable self-healable semiconducting polymer film for active-matrix strain-sensing array.

Author information

1
Department of Chemical Engineering, Stanford University, Stanford, CA 94305-5025, USA.
2
Department of Chemical Engineering, Kyung Hee University, Yongin 17104, South Korea.
3
Biomedical Research Institute, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, 02791 Seoul, South Korea.
4
School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 16419, South Korea.
5
Corporate Research and Development, Performance Materials Technology Center, Asahi Kasei Corporation, 2-1 Samejima, Fuji, Shizuoka 416-8501, Japan.
6
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
7
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305-5025, USA.
8
School of Polymer Science and Engineering, The University of Southern Mississippi, Hattiesburg, MS 39406, USA.
9
Department of Mechanical Engineering, Stanford University, Stanford, CA 94305-5025, USA.
10
Samsung Advanced Institute of Technology Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, South Korea.

Abstract

Skin-like sensory devices should be stretchable and self-healable to meet the demands for future electronic skin applications. Despite recent notable advances in skin-inspired electronic materials, it remains challenging to confer these desired functionalities to an active semiconductor. Here, we report a strain-sensitive, stretchable, and autonomously self-healable semiconducting film achieved through blending of a polymer semiconductor and a self-healable elastomer, both of which are dynamically cross-linked by metal coordination. We observed that by controlling the percolation threshold of the polymer semiconductor, the blend film became strain sensitive, with a gauge factor of 5.75 × 105 at 100% strain in a stretchable transistor. The blend film is also highly stretchable (fracture strain, >1300%) and autonomously self-healable at room temperature. We proceed to demonstrate a fully integrated 5 × 5 stretchable active-matrix transistor sensor array capable of detecting strain distribution through surface deformation.

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