Abstract
Silicon carbide nanotube (SiCNTs) has been proven as a suitable material for wide applications in high power, elevated temperature and harsh environment. For the first time, we reported in this article an effective synthesis of SiCNTs by microwave heating of SiO2 and MWCNTs in molar ratio of 1:1, 1:3, 1:5 and 1:7. Blend of SiO2 and MWCNTs in the molar ratio of 1:3 was proven to be the most suitable for the high yield synthesis of β-SiCNTs as confirmed by X-ray diffraction pattern. Only SiCNTs were observed from the blend of MWCNTs and SiO2 in the molar ratio of 1:3 from field emission scanning electron microscopy imaging. High magnification transmission electron microscopy showed that tubular structure of MWCNT was preserved with the inter-planar spacing of 0.25 nm. Absorption bands of Si-C bond were detected at 803 cm-1 in Fourier transform infrared spectrum. Thermal gravimetric analysis revealed that SiCNTs from ratio of 1:3 showed the lowest weight loss. Thus, our synthetic process indicates high yield conversion of SiO2 and MWCNTs to SiCNTs was achieved for blend of SiO2 and MWCNTs in molar ratio of 1:3.
Highlights
Silicon carbide (SiC) has attracted much attention and has being studied for the potential in many applications such as biosensors[1], photo-catalysts[2] and hydrogen storage[3] because it possesses several excellent properties and is an important biocompatible material[4]
It is worth mentioning that in X-ray diffraction (XRD) pattern of Silicon carbide nanotubes (SiCNTs) synthesized from the blend of SiO2 and multi-walled carbon nanotubes (MWCNTs) in the ratio of 1:1 in Figure 3 (a), there is a peak corresponding to the residual of unreacted SiO2 at 2θ = 23° associated with (100) planes of SiO2 particles
SiCNTs has been successfully quality SiCNTs compared to others ratio in which high yield synthesized from blend of SiO2 particles and MWCNTs in
Summary
Silicon carbide (SiC) has attracted much attention and has being studied for the potential in many applications such as biosensors[1], photo-catalysts[2] and hydrogen storage[3] because it possesses several excellent properties and is an important biocompatible material[4]. SiCNTs are currently synthesized by using chemical vapor deposition (CVD)[8] and carbothermal reduction of the silica by using conventional heating[9]. Additional production cost was needed since large consumption of energy was required to for the synthesis of SiCNTs. In addition, Latu-Romain et. Al[10,11] in their study of synthesis of the SiCNTs from silicon nanowire (Si NW) has successfully synthesized SiCNTs by hot filament CVD at temperature of 1100°C for 30 minutes using gold as catalyst. Continuous diffusion of Si gas into the layer of SiC has resulted in the formation of SiCNTs. the use of gold as catalyst incurred high cost and the need to synthesize Si NW required additional processing step which are time and energy consuming
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