Journal
CARBON
Volume 78, Issue -, Pages 601-608Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2014.07.051
Keywords
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Funding
- NRF of Korea [2012M3A7B4035195, 2009-0083540, 2012R1A6A1029029]
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We present a sensor of vertical forces based on single-layer graphene, with a working range that corresponds to the pressure of a gentle touch that can be perceived by humans. Polydimethylsiloxane (PDMS) is employed for the supporting material of the graphene layer and also works as a force absorber of the sensor. In spite of the low gauge factor that arises from the intrinsic electromechanical character of single-layer graphene, we achieve a resistance variation of about 17 +/- 7% in response to an applied vertical pressure of 10 kPa by introducing a pressure-amplifying structure of patterned lines that induces additional structural deformation of the graphene layer for the applied vertical force. In addition, we demonstrate a method to enhance the sensitivity of the sensor by applying resistive single-layer graphene. (C) 2014 Elsevier Ltd. All rights reserved.
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