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Abstract: Hexagonal boron nitride (h-BN) particles including hollow spheres (with a proportion of ~30–40%) and nanotubes (10%) have been synthesized by using sodium fluoroborate and sodium azide at 450°C for 20h. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) studies show that the as-obtained BN hollow particles are crystalline. The total specific surface area of the product calculated from Brunauer–Emmentt–Teller (BET) absorption measurement is 89.79m2/g, indicating that it may be utilized as a promising candidate for hydrogen storage container or catalyst. Thermal gravimetric analysis (TGA) result reveals its excellent thermal stability below 800°C. Its possible growth mechanism and the effects of reaction parameters were also briefly discussed. [Copyright &y& Elsevier]

Boron nitride hollow spheres were synthesized by the reaction of BBr3 and NaNH2 at room temperature; X-ray powder diffraction pattern could be indexed as hexagonal BN with the lattice constants of a=2.482 and c=6.701 A˚; high-resolution transmission electron microscopy image showed the hollow spheres consisted of BN nanoparticles, with diameter between 80 and 300 nm; a possible formation mechanism of BN hollow spheres was discussed. [Copyright &y& Elsevier]

Abstract: Nanocrystalline boron nitride (BN) was prepared by the reaction of BBr3 and Mg3N2 at 400 °C. X-ray powder diffraction (XRD) patterns can be indexed as hexagonal BN with the lattice constants of a=2.504 and c=6.671 Å. The transmission electron microscopy (TEM) images showed whisker-like and flake-like morphology. The product was also characterized by X-ray photoelectron spectrum (XPS) and Fourier transformation infrared spectroscopy (FTIR). [Copyright &y& Elsevier]