Synthesis and Characterization of Core-shell SiC/SiO2 Nanowires at Low Temperature

doi:10.3724/SP.J.1077.2013.12725

Abstract

Abstract: Core-shell SiC/SiO₂ nanowires were synthesized with formaldehyde resin as the carbon source and SiO₂ nano-powder as the silicon source at 1300℃ under argon atmosphere via the carbothermal reduction. The component, morphology and structure of the synthesized core-shell nanowires were systematically studied by X-ray diffraction, scanning electron microscope, transmission electronic microscope, high-resolution transmission electron microscope, and Raman spectroscope. The results show that the synthesized products are high-purity nanowires and it is found that the nanowires are quite uniform. The length of the nanowires can reach several millimeters, and the core-shell SiC/SiO₂ nanowires consist of a single crystalline β-SiC core with a diameter of about 30 nm and a uniform amorphous SiO₂ outer shell with a thickness of 12 nm. Compared to the single crystalline β-SiC, the emission spectrum from the photoluminescence of the as-synthesized core-shell SiC/SiO₂ nanowires has blueshift at room temperature. The formation mechanism of the core-shell SiC/SiO₂ nanowires is also discussed. The SiC core is grown in high temperature based on the vapor-solid mechanism. During cooling, the amorphous SiO₂ shell is formed by the reaction between SiO and CO gas.

Key words: core-shell SiC/SiO₂ nanowires, carbothermal reduction reaction, formaldehyde resin, photoluminescence

CLC Number:

TQ129

ZHAO Chun-Rong, YANG Juan-Yu, DING Hai-Yang, LU Shi-Gang. Synthesis and Characterization of Core-shell SiC/SiO₂ Nanowires at Low Temperature[J]. Journal of Inorganic Materials, 2013, 28(9): 971-976.

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Synthesis and Characterization of Core-shell SiC/SiO₂ Nanowires at Low Temperature

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