Low temperature synthesis of h-BN nanoflakes

摘要

Boron nitride (BN) with flake-like morphology has been synthesized by reacting powder H_3BO_3, Mg and NH_4Cl in an autoclave at 600℃ for 10 h. X-ray diffraction (XRD) patterns show the sample has hexagonal phase with lattice parameters a = 2.506 and c= 6.692 A. Transmission electron microscopy (TEM) and field emission scanning electron (FE-SEM) indicate the as-synthesized product is pure flake with a mean size of about 100 nm in thickness and 600 nm in width length. X-ray photoelectron spectra (XPS) give an average B/N atomic ratio of 0.98:1. Fourier transformation infrared spectroscopy (FT1R) has a strong B-N absorption at 1376 cm~(-1) and 814 cm~(-1).