Bioinspired Multifunctional Photonic‐Electronic Smart Skin for Ultrasensitive Health Monitoring, for Visual and Self‐Powered Sensing

Abstract Smart skin is highly desired to be ultrasensitive and self‐powered as the medium of artificial intelligence. Here, an ultrasensitive self‐powered mechanoluminescence smart skin (SPMSS) inspired by the luminescence mechanism of cephalopod skin and the ultrasensitive response of spider‐slit‐organ is developed. Benefitting from the unique strain‐dependent microcrack structure design based on Ti 3 C 2 T x (MXene)/carbon nanotube synergistic interaction, SPMSS possesses excellent strain sensing performances including ultralow detection limit (0.001% strain), ultrahigh sensitivity (gauge factor, GF = 3.92 × 10 7 ), ultrafast response time (5 ms), and superior durability and stability (>45 000 cycles). Synchronously, SPMSS exhibits tunable and highly sensitive mechanoluminescence (ML) features under stretching. A relationship between ML features, strain sensing performances, and the deformation has been established successfully. Importantly, the SPMSS demonstrates excellent properties as triboelectric nanogenerator (4 × 4 cm 2 ), including ultrahigh triboelectric output (open‐circuit voltage V OC = 540 V, short‐circuit current I SC = 42 µA, short‐circuit charge Q SC = 317 nC) and power density (7.42 W m −2 ), endowing the smart skin with reliable power source supply and self‐powered sensing ability. This bioinspired smart skin exhibits multifunctional applications in health monitoring, visual sensing, and self‐powered sensing, showing great potential in artificial intelligence.