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Water-proof and thermally inert flexible pressure sensors based on zero temperature coefficient of resistance hybrid films

2019-08-29

Authors: Gao, ZY; Jiang, K; Lou, Z; Han, W; Shen, GZ

JOURNAL OF MATERIALS CHEMISTRY C

Volume: 7 Issue: 31 Pages: 9648-9654 Published: AUG 21 2019 Language: English Document type: Article

DOI: 10.1039/c9tc02832c

Abstract:

The accurate measurement of pressure sensors realizes the idea of non-interference environmental monitoring, which is very important for the application of electronic skins (e-skins). Here, we designed a thermally inert flexible pressure sensor array based on a zero temperature coefficient of resistance (Z-TCR) hybrid film, consisting of multi-walled carbon nanotubes (MWCNTs) with a negative temperature coefficient (NTC) and graphite powders (GPs) with a positive temperature coefficient (PTC). In addition, to eliminate temperature interference, a water-proof effect can also be achieved by sealing the device in ethylene-vinyl acetate copolymer (EVA). The as-fabricated flexible pressure sensors exhibited excellent performances with ultrahigh sensitivity, fast response time, and good response stability at high frequency. The 5 x 5 pressure sensor array was also used for imaging spatial pressure distributions. The anti-environmental interference properties in combination with the excellent sensitivity, stability and extensibility show that the pressure sensor array has the potential for applications in e-skins.

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