摘要
Cubic shells and spherical nanoparticles of β-SiC were produced at 1273 K by processing the ceramic precursors formed from the reactions between vapors of organochlorosilanes, Me 2 SiCl 2 , MeSiCl 3 , MeSiHCl 2 , and PhSiCl 3 , and liquid Na at 523-723 K. From Me 2 SiCl 2 , a flexible linear polycarbosilane precursor was synthesized and covered the NaCl byproduct surface to form a cubic shape. Hollow cubic β-SiC shells were produced after the NaCl templates were removed. From MeSiCl 3 , a rigid cross-linked polycarbosilane was produced and phase segregated from the NaCl byproduct. The precursor was transformed into nanoparticles without specialmorphology. MeSiHCl 2 produced a cross-linked polysilane precursor at low temperatures, which can be converted into a mixture of β-SiC and Si nanoparticles. At high temperatures, the polysilane converted to polycarbosilane and produced hollow cubic β-SiC shells. The carbon-rich PhSiCl 3 generated cube-like particles as the final product, which contained β-SiC and carbon.