Biodegradable, highly sensitive and multifunctional mechanical sensor based on rGO-silk fibroin hydrogel for human motion detection and gesture recognition Hydrogels based flexible sensors have attracted tremendous attention in fields of artificial skin, motion detection and health management due to their excellent char-acteristics such as portability and wearability. Herein, a flexible, conductive, and bi-ocompatible hydrogel is prepared by proportionally mixing graphene oxide and silk fibroin.