Piezoelectric rubber films for autonomous physiological monitoring systems

摘要: Abstract We have successfully demonstrated the fabrication of piezoelectric rubber films and their applications in heartbeat sensing human energy harvesting. To realize desired stretchability electromechanical sensitivity, cellular polydimethylsiloxane (PDMS) structures with micrometer-sized voids are internally implanted bipolar charges, which function as dipoles respond promptly to diverse stimuli. The resulting composite behave like (with an elastic modulus about 300 kPa) show strong piezoelectricity a coefficient d33 higher than 1500 pC/N). In prototype demonstration, autonomous monitoring system utilizing stacked PDMS is demonstrated. While integrated 12-μA h solid-state storage device 552-nW nano-power charge amplifier, harvested from body stored employed monitor heartbeat. With working area 10 cm2 compressive load 10 kg, it estimated that 0.1 μC/cycle can be collected using single-layered film. Furthermore, multiple layers connected parallel magnify output. As such, films, both stretchable harvesters highly-sensitive impact sensors, possess great potential for realization wearable implantable physiological systems.