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High Sensitivity Flexible Electronic Skin Based on Graphene Film

1
The School of Aerospace Science and Technology, Xidian University, Xi’an 710071, China
2
Science and Technology on Space Physics Laboratory, Beijing 100076, China
3
Beijing Key Laboratory of Environmental Science and Engineering, School of Chemical Engineering and the Environment, Beijing Institute of Technology, Beijing 100081, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(4), 794; https://doi.org/10.3390/s19040794
Received: 26 November 2018 / Revised: 16 January 2019 / Accepted: 29 January 2019 / Published: 15 February 2019
(This article belongs to the Special Issue E-Skin Sensors)
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PDF [10221 KB, uploaded 15 February 2019]
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Abstract

Electronic skin with high sensitivity, rapid response, and long-term stability has great value in robotics, biomedicine, and in other fields. However, electronic skin still has challenges in terms of sensitivity and response time. In order to solve this problem, flexible electronic skin with high sensitivity and the fast response was proposed, based on piezoresistive graphene films. The electronic skin was a pressure sensor array, composed of a 4 × 4 tactile sensing unit. Each sensing unit contained three layers: The underlying substrate (polyimide substrate), the middle layer (graphene/polyethylene terephthalate film), and the upper substrate bump (polydimethylsiloxane). The results of the measurement and analysis experiments, designed in this paper, indicated that the flexible electronic skin achieved a positive resistance characteristic in the range of 0 kPa–600 kPa, a sensitivity of 10.80 Ω /kPa in the range of 0 kPa–4 kPa, a loading response time of 10 ms, and a spatial resolution of 5 mm. In addition, the electronic skin realized shape detection on a regular-shaped object, based on the change in the resistance value of each unit. The high sensitivity flexible electronic skin designed in this paper has important application prospects in medical diagnosis, artificial intelligence, and other fields. View Full-Text
Keywords: aerospace; flexible sensor; micro-pressure measurement; sensitivity compensation aerospace; flexible sensor; micro-pressure measurement; sensitivity compensation
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Lü, X.; Yang, J.; Qi, L.; Bao, W.; Zhao, L.; Chen, R. High Sensitivity Flexible Electronic Skin Based on Graphene Film. Sensors 2019, 19, 794.

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