Mesoporous C-SiO2 nanocomposite with a low C/SiO2 molar ratio was infiltrated with polycarbosilane (PCS) which is a preceramic precursor for silicon carbide. Different silicon carbide nanostructures were synthesized by carbothermal reduction of mesoporous C-SiO2 nanocomposites via different heat treatments. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption-desorption analysis were used to characterize C-SiO2 nanocomposites and SiC products. SiC was not formed in the mesoporous C-SiO 2 nanocomposites without PCS at 1450°C. However, when it was infiltrated with PCS to allow a conversion of PCS into SiC nuclei in the mesopores during the heat treatment, highly crystalline SiC nanofibers and nanoparticles were produced.
|Number of pages||3|
|Journal||Australian Ceramic Society. Journal|
|Publication status||Published - 2009|
- Carbothermal reduction
- Preceramic precursor