Recognition of Different Rough Surface Based Highly Sensitive Silver Nanowire-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, distinguishing various fruit surfaces. The flexible skin containing silver nanowires has obvious antibacterial properties against Escherichia coli and Staphylococcus aureus. Furthermore, the prepared flexible skin can be applied to various fields such as artificial intelligence, tactile perception, and personal medical equipment, demonstrating its great potential in smart skin.