“…Many methods have been developed for synthesis of hexagonal BN including classical high-temperature routes [1,3] (e.g., reaction of boron oxide and ammonia [16], direct nitridation of boron with N 2 [1] and carbothermal reduction and nitridation of boron oxide [17]), vapor deposition methods (e.g., reaction of boron trichloride and ammonia [18]), condensed-phase pyrolysis techniques (e.g., thermal decomposition of borazene or bisborazinylamine [19]), solid-state metathesis [7,20,21], pyrolysis [4,10,12,22] and combustion synthesis [23][24][25]. Most of these methods have to be carried out under a high temperature heating or a high N 2 pressure and require a long processing time.…”