A\nSelf-Healable Bifunctional Electronic Skin

Abstract

For\nthe mimicry of human skin, one of the challenges is how to\ndetect and recognize different stimulus by electronic device, while\nstill has the ability of skin self-recovery at the same time. Because\nof the excellent elasticity and flexibility, strong self-healing ability,\nin this paper, we reported a bifunctional self-healing e-skin with\npolyurethane (PU) and polyurethane@multiwalled carbon nanotubes (PU@CNT)\nas the sensing materials by integrating a resistance temperature sensor\non top of a capacitive pressure sensor on the same flexible cellulose\nnanocrystals@carboxylated nitrile rubber@polyethylenimine (CNC@XNBR)\nsubstrate. Studies found that each type of sensor exhibited fast and\nsuperior response to only the target stimuli. Meanwhile, due to the\nself-recovery properties of PU and CNC@XNBR, as-fabricated e-skin\nhas the self-healing ability after damage and remains excellent sensitivity\nto temperature and pressure after healing. A 5 × 5 device array\nwas also fabricated, which can simultaneously image the pressure and\ntemperature distribution.