A Skin‐Like Pressure‐ and Vibration‐Sensitive Tactile Sensor Based on Polyacrylamide/Silk Fibroin Elastomer

With bio-integrated electronics booming, stretchable, elastic, compliance, and biocompatible elastomers attract immense research interest due to their potential to integrate with electronic devices and soft tissues. In this work, a double network skin-like elastomer based on hydrophobic-polyacrylamide/silk fibroin (HSF) is synthesized. The addition of the fibroin in polyacrylamide hydrogel significantly improves its stretchability, resilience, and tear resistance. Specifically, the HSF elastomer demonstrates a tensile strain as high as 1000% with the corresponding tensile stress of 0.27 MPa and great resilience (550 cycles). Based on such HSF, a hybrid mechanoreceptor sensor is fabricated, which can simultaneously implement slow adaptive and fast adaptive pulses like human skin. This device realizes the detection of a variety of human movements such as joint movement, vocalization, or pulse and high-frequency vibration signal recognition, which demonstrates its potential applications in bio-integrated electronics.