Tunable Piezoresistivity of Nanographene Films for Strain Sensing
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- 6 February 2015
- journal article
- Published by American Chemical Society (ACS) in ACS Nano
- Vol. 9 (2), 1622-1629
- https://doi.org/10.1021/nn506341u
Abstract
Graphene-based strain sensors have attracted much attention recently. Usually, there is a trade-off between the sensitivity and resistance of such devices, while larger resistance devices have higher energy consumption. In this paper, we report a tuning of both sensitivity and resistance of graphene strain sensing devices by tailoring graphene nanostructures. For a typical piezoresistive nanographene film with a sheet resistance of ∼100 KΩ/□, a gauge factor of more than 600 can be achieved, which is 50× larger than those in previous studies. These films with high sensitivity and low resistivity were also transferred on flexible substrates for device integration for force mapping. Each device shows a high gauge factor of more than 500, a long lifetime of more than 10(4) cycles, and a fast response time of less than 4 ms, suggesting a great potential in electronic skin applications.Keywords
Funding Information
- Ministry of Science and Technology of the People's Republic of China (2012CB921302, 2013CB934500, 2013CBA01602)
- National Natural Science Foundation of China (11174333, 11204358, 61325021, 61390503, 91223204)
- Chinese Academy of Sciences (XDB07010100)
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