Towards wearable multifunctional cellulose nanofiber/silver nanowire/graphene oxide film: Electromagnetic protection, antibacterial, and motion monitoring

Abstract

Strong electromagnetic radiation has seriously threatened human body health due to the rapid development of 5G electronic devices towards millimeter wave. The demand for wearable and antibacterial materials with high-performance electromagnetic protection is very urgent, but still lack reasonable structure design to realize multifunctional structure. Here, a wearable and antibacterial cellulose nanofiber/silver nanowire/graphene oxide (CNF-Ag NWs/GO) hybrid film with a multilayer structure is successfully fabricated by a convenient dip-coating method. Such a multilayer structure is constituted by a flexible CNF substrate, electromagnetic shielding blocks of Ag NWs and encapsulation units of GO. Benefiting from the packaging of GO sheets by the hydrogen bond interaction, a dense Ag NWs conductive network is woven. The resulting film shows extremely low sheet resistance of 0.9 Ω/sq and superior electromagnetic shielding performance of 80 dB in the millimeter wave range (26-40 GHz). Meanwhile, an excellent antibacterial property and a motion monitoring ability with high sensitivity are also acquired. The work realizes a multi-functional integration and provides new insight into the development of wearable electromagnetic protection materials.