Green and Controllable Synthesis of Large-Scale High-Quality Two-Dimensional Boron Nitride by Ambient-Pressure Chemical Vapor Deposition

Abstract

Although two-dimensional (2D) hexagonal boron nitride (h-BN) has been synthesized on metal foil by chemical vapor deposition (CVD) for several years, toxic precursors and low pressure are still used during growth. Here we use Cu foil as the substrate to synthesize large-area high-quality monolayer h-BN film by CVD just with BN powders and nitrogen gas under ambient pressure. Similar growth strategy can also be used to obtain three-dimensional (3D) hierarchical h-BN form on a copper foam template. Both of the monolayer film and 3D foam composites exhibit excellent mechanical performance. Our results provide a greener and more economical synthetic route for high-quality h-BN products aimed at its practical large-scale applications.