Preparation and Characterization of Silicon Carbide Nanofiber

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J. Korean Ceram. Soc. > Volume 37(4); 2000 > Article

Journal of the Korean Ceramic Society 2000;37(4): 376.

탄화규소 나노섬유의 제조 및 물성

신현익, 송현종, 김명수, 임연수, 이재춘

명지대학교 세라믹화학공학부

Preparation and Characterization of Silicon Carbide Nanofiber

ABSTRACT

Carbon nanofibers with an average diameter of 100nm were reacted with SiO vapor generated from a mixture of Si and SiO2 to produce silicon carbide nanofibers at temperature ranging 1200∼1500$^{circ}C$ under vacuum. The nanofiber reacted at 1200$^{circ}C$ for two hours consisted of silicon carbide with an average crystallite size of 10-20nm, amorphous silica and a significant amount of unreacted carbon. The surface area of silicon carbide nanofiber, obtained after removal of amorphous silica and unreacted carbon from converted carbon nanofibers at 1200$^{circ}C$, was as high as 150㎡/g. With increasing reaction temperature to 1500$^{circ}C$, the surface area was decreased to 14㎡/g. Growth of SiC crystallite size with increasing conversion temperature of carbon nanofiber was confirmed from Scherrer formula using the (111) diffraction line and TEM images of converted carbon nanofibers.

Key words: Carbon nanofiber, Silicon carbide, Surface areas, Crystallite size