Pressure sensor based on wave-structured rGO film for wearable human health monitoring

Recently, pressure sensor based on micro-structured film has gained attentions for applications in future wearable electronic devices, because of their portability and low energy consumption in operation. Here, we report a sensitive pressure sensor based on a wave-structured rGO film, which was prepared by a stretch-relaxation approach on an elastic substrate. When the stretch ratio of the pressure sensor is 180%, the sensitivity can reach 2.64 kPa −1 (0–30 kPa), and it has good electrical stability, fast response time of 12 ms and fast recovery time of 20 ms. In addition, in the present work, pressure sensors are used to detect physiological signals including pulse, finger bending, speech recognition, breathing, etc. At the same time, the assembled sensor array realizes three-dimensional mapping of spatial pressure. The results show that the changes of pressure sensor Δ I / I 0 are consistent with the sensitivity test results under different pressures.