Recognition of different rough surfaces based highly sensitive silver nanowires-graphene flexible hydrogel skin

Artificial flexible skin materials with high sensitivity, different roughness surface recognition and a wide range of pressure sensing properties are urgent needs of artificial intelligence and wearable devices. Inspired by the identification ability between different rough objects of human skin，the novel flexible sensor device was developed to improve pressure sensitivity and surface roughness identification, consisting of silver nanowires, graphene and biomineral hydrogels. Here, the prepared flexible skin has a wide range of high sensitivities including high pressure sensitivity (0.9 ~ 5 KPa) and low pressure sensitivity, which can detect the pressure of the rice size. Since graphene loaded with silver nanowires easily forms the sheet structure, it can undergo slight changes in pressure such as sphygmus rhythm, sound vibration, and joint bending. The flexible skin detects changes in electrical resistance caused by dynamic interaction between the sensor and the surface of the material being tested, dist...