A highly sensitive flexible resistive pressure sensor based on an air gap structure was presented. The flexible pressure sensor consists of two face to face polydimethylsiloxane (PDMS) films covered with carbon nanotubes (CNTs). The pressure sensor with a 230 μm thickness air gap has relatively high sensitivity (58.9 kPa−1 in the range of 1–5 Pa, 0.66 kPa−1 in the range of 5–100 Pa), low detectable pressure limit (1 Pa), and a short response time (less than 1 s). The test results showed that the pressure sensor with an appropriate air gap has excellent pressure sensitive performance and application potential.

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Published in RSC Advances, v. 7, issue 76, p. 48354-48359.

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This work was supported by the grants from the National Natural Science Foundation of China under Grant No. 61474016, 61405026, 61405025, and National Basic Research Program of China (973 Program) under Grant No. 2015CB351905.

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Electronic supplementary information (ESI) available: Details of the samples' SEM images, Raman spectra, stability response diagram. See DOI:10.1039/c7ra09392f

c7ra09392f1.pdf (1367 kB)
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