Wearable anti-temperature interference pressure sensor with ridge-like interlocking microstructures

As wearable pressure sensors have to interact with the external environment in practical application, the problem that ambient temperature changes in such environment usually interferes with sensor's pressure measurement performance illustrates the importance of having wearable pressure sensors produce electrical signal independent of temperature. This study proposes a new design of a wearable anti-temperature interference pressure sensor with a near-zero temperature coefficient of resistance (TCR). The sensor is fabricated by a simple method of coating the reduced graphene oxide/Ag nanowires (rGO/Ag NWs) composite on the surface of the polydimethylsiloxane (PDMS) polymer film with ridge-like microstructures. The wearable anti-temperature interference pressure sensor yields a high sensitivity of - 1.58 kPa(-1) in the pressure range of 0-400 Pa, a quick response time (25 ms), and a high durability (after 1000 loops). It can be applied to monitor a variety of human movements, including large movements such as finger and wrist bending, and fine movements such as swallowing and breathing, and is virtually insusceptible to temperature changes.