▎ 摘　　要

Flexible electronic skin is a flexible sensor system that imitates human skin. Recently, flexible sensors have been successfully developed. However, the droplet sliding sens-ing technology on a flexible electronic skin surface is still challenging. In this Letter, a flexible droplet sliding sens-ing surface is proposed and fabricated by laser-reduced graphene oxide (LRGO). The LRGO shows porous struc-tures and low surface energy, which are beneficial for infusing lubricants and fabricating stable slippery surfaces. The slippery surface guarantees free sliding of droplets. The droplet sliding sensing mechanism is a combination of tribo-electricity and electrostatic induction. After a NaCl droplet slides from lubricant-infused LRGO, a potential difference (similar to 0.2 mV) can be measured between two Ag electrodes. This study reveals considerable potential applications in intelli-gent robots and the medical field.(c) 2023 Optica Publishing Group