One-step Solid-state Reaction for the Synthesis of Hexagonal or Rhombohedral Boron Nitride Nanoplates in Autoclaves

Abstract

Abstract Crystalline hexagonal boron nitride (h-BN) hexagonal nanoplates were synthesized by the reaction of B2O3, NH4F, and metallic Na at 700 °C. The edge sizes of the hexagonal nanoplates are 400 nm, and the average thickness is 100 nm. As the reaction temperature was set at 500 °C, rhombohedral boron nitride (r-BN) triangular nanoplates nearly 200 nm across and about 20 nm thick were obtained. TGA analysis results reveal that thermal stability of h-BN hexagonal nanoplates was better than that of r-BN triangular nanoplates in air.