Electromagnetic Shielding Triboelectric Yarns for Human-Machine Interacting

Electromagnetic radiation, as one of the public hazards that injures human health and information safety, shall be shielded from the ambient environment. Here, by the virtue of polypyrrole polymerized polyamide yarns and silicone rubber, a yarn-based electromagnetic shielding-triboelectric nanogenerator (EMS-TENG) equipped with sensing ability is presented, which not only generates electricity from harvesting body motion energy but also serves as EMS to prevent electromagnetic interference. With the aid of knitting method, the developed EMS-TENG fabric exhibits the EMS effectiveness of 32.49 dB in 8.2-12.5 GHz and achieves a maximum instantaneous peak power density of 142.27 mu W m(-1). Furthermore, a real-time human-interactive system is developed by adopting the Internet of Things technology and EMS-TENG sensor. Based on the above, a simulated intelligent calculator with multiplication and division function is proposed, which can successfully translate electronic signals to digital numbers. With energy harvesting and self-powered sensing abilities, the EMS-TENG can convert mechanical energy into electrical signals from human movements. Looking forward, the EMS-TENG spurs an innovative technique toward a self-powered human-interactive sensing and functional protective textile for next-generation intelligent wearable applications.