Synthesis and Characterization of Hexagonal Boron Nitride Nanosheets

Abstract

In this article, hexagonal boron nitride nanosheets have been successfully synthesized by the method of solid-phase sintering using boron oxide (B2O3) and sodium azides (NaN3) as the reactants and magnesium powder as catalyst at 450 °C. Results from XRD suggest that the synthesized products be indexed as pure h-BN. The surface morphology of the products was observed by the scanning electron microscope, that the products are constituted of a large number of the structure of nanosheets. And the SEM images show the sheetlike materials with a diameter of about 500-900 nm, and the thickness is about 100 nm. The far-infrared absorption spectrum showed that the typical sp2 hybrid structure of hexagonal boron nitride. The optical properties of the product are observed in the PL spectra, which shows that the prepared BN emits strong visible luminescence at 445 nm (λex = 325 nm).