NiO@SiO2/PVDF: A Flexible Polymer Nanocomposite for a High Performance Human Body Motion-Based Energy Harvester and Tactile e-Skin Mechanosensor

作者：Biplab Dutta, Epsita Kar, Navonil Bose, Sampad Mukherjee · 发表于：ACS Sustainable Chemistry & Engineering · 年份：2018 · DOI：10.1021/acssuschemeng.8b01851 · 被引用次数：143 · 研究领域：Advanced Sensor and Energy Harvesting Materials、Tactile and Sensory Interactions、Conducting polymers and applications

Advancement in self-powered portable and wearable electronics mostly depends on the realization of an efficient human activity-based energy harvester and electronic skin (e-skin)-mimicking tactile mechanosensing property of natural human skin. A human activity-based energy harvester can supply power to flexible, potable, electronics equipment associated with the human body, whereas a tactile e-skin mechanosensor can precisely detect static and dynamic pressure stimuli. Here, we report development of a NiO@SiO 2 /PVDF nanocomposite, a facile piezoelectric material possessing superior flexibility that is light in weight and has low cost, which is an excellent choice for the next generation mechanical energy harvester and tactile e-skin sensors. The fabricated piezoelectric nanogenerator (PNG) comprising nanocomposites shows very promising output under application of the biomechanical force on it. PNG15 exhibits high output voltage (53 V), adequate current density (∼0.3 μA/cm 2 ), high power density (685 W/m 3 ), and superior conversion efficiency (13.86%). Gentle human finger imparting onto the PNG produces enough electric power to directly illuminate as many as 85 numbers of commercial LEDs and charge a 2.2 μF capacitor up to 22 V within 450 s. The nanogenerator is successfully exploited to generate electrical power by converting mechanical energy from different human activities. We also demonstrate the high mechanosensing capability of a thin, flexible e-skin sensor based on ...