Ultra-long Sialon nanobelts: Large-scale synthesis via a pressure enhanced CVD process and photoluminescence characteristics

Large quantities of core-shell structured Sialon nanobelts containing amorphous carbon in the shell were synthesized by pressure enhanced CVD at 1450 °C without a catalyst. The products are high-quality nano single-crystalline with a uniform morphology. The yield and aspect ratio are systematically controlled by changing the growth temperature and chamber pressure. The nanostructures were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption-desorption isotherms and high-resolution transmission electron microscopy (HRTEM). A stepwise reaction model and luminescence characteristics were proposed based on the experimental results.