Synthesis and characterization of silicon carbide, silicon oxynitride and silicon nitride nanowires

Abstract

Several methods have been employed to synthesize SiC nanowires. The methods include heating silica gel or fumed silica with activated carbon in a reducing atmosphere, the carbon particles being produced in situ in one of the methods. The simplest method to obtain β-SiC nanowires involves heating silica gel with activated carbon at 1360°C in H₂ or NH₃. The same reaction, if carried out in the presence of catalytic iron particles, at 1200°C gives α-Si₃N₄ nanowires and Si₂N₂O nanowires at 1100°C. Another method to obtain Si₃N₄ nanowires is to heat multi-walled carbon nanotubes with silica gel at 1360°C in an atmosphere of NH₃. In the presence of catalytic Fe particles, this method yields α-Si₃N₄ nanowires in pure form.