Synthesis of Silicon Carbide Nanowhiskers by Microwave Heating: Effect of Heating Temperature

Chun Hong Voon

Abstract


Silicon carbide (SiC) is an attractive material for its excellent properties such as wide band gap, high chemical stability and thermal conductivity. The conventional method for the preparation of SiC is Acheson process, a time and energy consuming process. In this article, demonstration of SiC nanowhiskers synthesis has been done by using microwave heating. Silica and graphite in the ratio 1:3 were mixed in ultrasonic bath, dried on hotplate and cold pressed uniaxially into a pellet die. The pellets were heated by using laboratory microwaves furnace at 1350ºC, 1400ºC and 1450ºC with heating rate of 20oC/min and soaked for 40 minutes. Different characterizations have been done to study the effect of heating temperature on the synthesis of SiC nanowhiskers. A temperature at 1400ºC is proved to be the most ideal for the synthesis of SiC nanowhiskers. β-SiC appeared as the only phase in the x-ray diffraction pattern of SiC nanowhiskers formed at 1400˚C with no traces of raw materials. Field emission scanning electron microscopy imaging confirmed the presence of only a negligible amount of graphite or silica in SiC nanowhiskers synthesized at 1400˚C. Further, Energy dispersive x-ray spectroscopy analysis revealed that only elemental C and Si were present in synthesized SiC nanowhiskers. Meanwhile, photoluminescence spectrum indicated the presence of single phase β-SiC peak at 440 nm which is associated with band gap of 2.8 eV. Single absorption bands of Si-C bond were detected at 803.5 cm-1 in fourier transform infrared analysis. SiCNWs produced in this study at 1400˚C has good thermal stability with 6% of weight loss, indicates its potentiality.

Keywords


Microwave heating; Silicon carbide nanowhiskers; Synthesis; Graphite; Silica

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