Robust 2D layered MXene matrix–boron carbide hybrid films for neutron radiation shielding

Large-scale fabrication of neutron-shielding films with flexible or complex shapes is challenging. Uniform and high boron carbide (B 4 C) filler loads with sufficient workability are needed to achieve good neutron-absorption capacity. Here, we show that a two-dimensional (2D) Ti 3 C 2 T x MXene hybrid film with homogeneously distributed B 4 C particles exhibits high mechanical flexibility and anomalous neutron-shielding properties. Layered and solution-processable 2D Ti 3 C 2 T x MXene flakes serve as an ideal robust and flexible matrix for high-content B 4 C fillers (60 wt.%). In addition, the preparation of a scalable neutron shielding MXene / B 4 C hybrid paint is demonstrated. This composite can be directly integrated with various large-scale surfaces (e.g., stainless steel, glass, and nylon). Because of their low thickness, simple and scalable preparation method, and an absorption capacity of 39.8% for neutrons emitted from a 241 Am 9 Be source, the 2D Ti 3 C 2 T x MXene hybrid films are promising candidates for use in wearable and lightweight applications.