Self-powered flexible sensors play an increasingly important role in wearable and even implantable electronic devices. Silk protein is an ideal material for flexible sensors because of its terrific biocompatibility and controllable degradation rate. Here, we overcome the problem of mechanical flexibility and poor electrical conductivity of proteins, and develop a highly transparent, biocompatible, full-degradable and flexible triboelectric nanogenerator (Bio-TENG) for energy harvesting and wireless sensing. First, the mechanical flexibility of the silk protein film is greatly enhanced by the mesoscopic functionalization of regenerated silk fibroin (RSF) via adding glycerol and polyurethane (PU). Second, hollow silver nanofibers are constructed on the silk film to form an air-permeable, stretchable, biocompatible and degradable thin layer and utilized as friction electrode. The obtained Bio-TENG demonstrates high transparency (83% by one Ag gird layer), stretchability (Ɛ = 520%) and an instantaneous peak power density of 0.8 W m⁻² that can drive wearable electronics. Besides, the Bio-TENG can work as artificial electronic skin for touch/pressure perception, and also for wirelessly controlling Internet of Things as a switch.

自供电的柔性传感器在可穿戴甚至可植入的电子设备中扮演着越来越重要的角色。蚕丝蛋白具有出色的生物相容性和可控的降解速率，是用于柔性传感器的理想材料。在这里，我们克服了蛋白质的机械柔韧性和导电性差的问题，并开发了一种高度透明，生物相容，可完全降解和柔韧性的摩擦纳米发电机（Bio-TENG），用于能量收集和无线传感。首先，通过添加甘油和聚氨酯（PU），再生丝素蛋白（RSF）的介观功能化大大提高了丝蛋白膜的机械柔韧性。其次，将中空的银纳米纤维构建在丝膜上，以形成透气，可拉伸，具有生物相容性和可降解性的薄层，可用作摩擦电极。所获得的Bio-TENG表现出高透明度（一层银网格层的83％），可拉伸性（Ɛ= 520％）和0.8 W m的瞬时峰值功率密度⁻²可以驱动可穿戴电子设备。此外，Bio-TENG可以用作人造电子皮肤，用于触摸/压力感知，还可以作为开关无线控制物联网。