Facile Preparation of MXene/BP Nanocomposite Films with High Thermal Conductivity and Excellent Flame Retardancy

Consider that black phosphorene (BP) nanosheets can compensate each other between the MXene layers, thus preventing the agglomeration of MXene, and forming a more compact microstructure. This study successfully synthesizes f-MXene non-covalently modified by the strong electrolyte PHMB. A series of MXene/BP nanocomposite films are prepared by the strong electrostatic interaction between f-MXene and BP nanosheets and verified by FTIR, XRD, and XPS. The cross-section SEM imaging further reveals the formation of densely ordered aligned microstructures. Thanks to the compensation effect of BP nanosheets between f-Mxene layers, and constructed more efficient thermal conductivity pathways. With a low amount (5 wt%) of BP, the in-plane and through-plane thermal conductivity of 5-MXene/BP film increased to 12.71 and 0.37 W m-1 K-1, respectively. TGA and MCC results demonstrate the flexible 5-MXene/BP film exhibited an ultra-low total release rate (5.8 kJ g-1) and excellent thermal stability (66.74 wt% residual carbon). In consideration of their improvement in thermal conductive performance, MXene/BP nanocomposite film can be the most promising candidates for thermal management applications.