Bionic Fish-scale Surface Structures Fabricated via the Air/Water Interface for Flexible and Ultrasensitive Pressure Sensors

In recent years, wearable and flexible sensors have attracted considerable research interest and effort is owing to their broad application prospects in wearable devices, robotics, health monitoring, and so on. High sensitivity and low-cost pressure sensors are the primary problems to be solved in practical application. Herein, a convenient and low-cost process to fabricate bionic fish-scale structures polydimethylsiloxane (PDMS) film via air/water interfacial formation technique is presented. High-sensitivity flexible pressure sensors can be constructed by assembling conductive films of graphene nanosheets (GNPs) into a microstructured film. Thanks to the unique fish-scale structures of PDMS films, the prepared pressure sensor has excellent performance with high sensitivity (-70.86 kPa1). In addition, our pressure sensors can detect weak signals such as wrist pulses, respiration and voice vibrations. Moreover, the whole process of pressure sensor preparation is cost-effective, eco-friendly and controllable. The results indicate that the prepared pressure sensor has a cost-effective and efficient advantage in future applications for monitoring human physiological signals and sensing subtle touch, which may broaden their potential applications in wearable devices.