“…26 These properties make h-BN an interesting material for many applications such as lubricants, protective and optical coatings, and advanced ceramic composites. [27][28][29] To date, many methods have been developed for the synthesis of hexagonal BN including classical high-temperature routes (e.g., reaction of boron oxide and ammonia, direct nitridation of boron with N 2 at 1400-1900 C and carbothermal reduction and nitridation of boron oxide at 1500 C), vapor deposition methods (e.g., reaction of boron trichloride and ammonia), condensed-phase pyrolysis techniques (e.g., thermal decomposition of borazene or bisborazinylamine), solid-state metathesis, and pyrolysis and combustion synthesis. [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] Most of these methods have to be carried out under high temperature or high N 2 pressure and require long processing times.…”