Active-Powering Pressure-Sensing Fabric Devices
Smart flexible sensing devices with high-comfort and self-powered characteristics are essential in the future generation wearable human-sensing interface. However, most of the current sensing devices cannot work independently and require external power. Here, we first introduced an active-powering pressure-sensing fabric (APPS) device, integrating a soft-matter battery unit with a fabric-based sensing substrate into one flexible device architecture, which offers comfortable and reliable human-sensing interface with continuing system powering capacity, for wearable physiological and activity monitoring. Notably, the APPS fabric demonstrates an open voltage of 1 V, a short circuit of 35 mA/cm2 and a capacity of 2.6 mAh/cm2. Specifically designed solid neutral hydrogel electrolyte shows high safety and high force-resistance, guaranteeing the stability of the power output under pressure. Moreover, it exhibits the highest sensitivity of 19.6 Ω-1/kPa in a test pressure range (of <300 kPa) and a mechanical response time of 9 ms. For wearable applications, we have packaged the APPS fabric into an adhesive bandage format, from which a series of pressure detection demonstrations have been successfully implemented without using any power source. In particular, the APPS fabric device can power the whole system by itself for signal detection and wireless data transmission via Bluetooth or LED. Benefited from the unique properties of the active powering and its remarkable performance, the APPS device hold enormous potential for the emerging wearable applications, including health monitoring, gesture recognition and motion monitoring.