An ultra-sensitive and rapid response speed graphene pressure sensors for electronic skin and health monitoring

Design of pressure sensors with ultra-sensitivity, rapid response speed and long-term stability is a key procedure to fulfill high performance electronic skins. Herein, we report the fabrication of a self-assembled 3D films platform that combines a natural viscoelastic property material P(VDF-TrFe) with an electrically conductive material rGO for the first time. Notably, modular assembly of the rGO-encapsulated P(VDF-TrFe) nanofibers led to the fabrication of a highly sensitive pizeoresistive pressure sensor which exhibited high sensitivity (15.6 kPa^-1), low detection limit (1.2 Pa) and working voltage (1 V). The excellent long-term stability under 100,000 cycles and rapid response time of 5 ms at 50 Hz are particularly captivating. Besides, using the simple and versatile procedures, a framework to make integrated sensor array platforms easily can be used as highly sensitive electronic skins for mapping spatial pressure distribution, and monitoring the human physiological signals, including the real-time pulses and muscle movements.