Synthesis of SiC nanowires and nanotubes sheathed with BN

Taguchi, Tomitsugu; Igawa, Naoki   ; Shamoto, Shinichi  

SiC nanowires and nanotubes sheathed with BN were synthesized by annealing C-SiC and SiC nanotubes at 1600 and 1700 C for 5 h with BN powder in Ar gas. According to TEM observation, the BN coating was very thin and the layer number of BN coating was less than 10. The BN coating on the surface of SiC nanotubes was not produced by the heat treatment at 1500 C. This result revealed that BN on the surface of SiC nanomaterials produced by heat treatment of higher than 1600 C. After the heat treatment of higher than 1600 C, many nanotubes transformed to nanowires because the inner space of nanotubes was occluded due to the SiC grain growth by heat treatment.