Journal of Inorganic Materials ›› 2013, Vol. 28 ›› Issue (9): 971-976.doi: 10.3724/SP.J.1077.2013.12725

• Research Paper • Previous Articles     Next Articles

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

ZHAO Chun-Rong, YANG Juan-Yu, DING Hai-Yang, LU Shi-Gang   

  1. (General Research Institute for Nonferrous Metals, Beijing 100088, China)
  • Received:2012-11-30 Revised:2013-02-04 Online:2013-09-20 Published:2013-08-14
  • Contact: LU Shi-Gang. E-mail:slu@grinm.com
  • About author:ZHAO Chun-Rong. E-mail:zhaocr04@sohu.com
  • Supported by:

    863 program(2012AA110102); National Natural Science Foundation of China(51004016; 51004017)

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