The
development of pressure sensors with high sensitivity and effectiveness
that exhibit linearity over a wide pressure range is crucial for wearable
devices. In this study, we fabricated a novel ionic liquid (IL)/polymer
composite with a convex and randomly wrinkled microstructure in a
cost-effective and facile manner using an opaque glass and stretched
polydimethylsiloxane template. The fabricated IL/polymer composite
was used as the dielectric layer in a capacitive pressure sensor.
The sensor exhibited a high linear sensitivity of 56.91 kPa–1 owing to the high interfacial capacitance formed by the electrical
double layer of the IL/polymer composite over a relatively wide range
(0–80 kPa). We also demonstrated the sensor performance for
various applications such as a glove-attached sensor, sensor array,
respiration monitoring mask, human pulse, blood pressure measurement,
human motion detection, and a wide range of pressure sensing. It would
be expected that the proposed pressure sensor has sufficient potential
for use in wearable devices.
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