Wearable, ultrathin and transparent bacterial celluloses/MXene film with Janus structure and excellent mechanical property for electromagnetic interference shielding

Functional film with admirable flexibility, transparency and conductivity meets the requirements of directly contacting with the skin, is significantly desirable. Herein, we demonstrate a novel Janus bacterial celluloses (BCs)/MXene film prepared by a facile vacuum filtration, which shows the potential as skin-contactable materials. The BCs act as a substrate and framework to effectively trap the permeated MXene nanosheets rather than simply mixing, which lead to formation of Janus structure. A thin (∼1.732 μm), transparent, and light BCs/MXene film shows excellent tensile strength (up to ∼ 532.87 MPa) and folding-endurance (∼6152 cycles). More importantly, the strong interaction between BCs and MXene is proved by theoretical computations and experimental tests. In addition, it exhibits a specific shielding effectiveness (SSE/t) of ∼ 69455.2 dB cm2 g−1. These features make the composite film a promising candidate for wearable devices, military technology, and human electronic equipment.