Synthesis of SiC@SiO2 Nanocables via a Catalyst-free Carbothermal Reduction Method

doi:10.15541/jim20190028

Abstract

Abstract:

SiC@SiO₂ nanocables (NC), as a new functional nanocomposite, have captured widespread attention due to their excellent performances and widely application prospects. Therefore, it is significant to develop a kind of effective, economical and environmental method to prepare SiC@SiO₂ NC. Herein, a catalyst free carbothermal reduction method was developed to synthesize SiC@SiO₂ NC fast and efficently, through heating the mixture of silicon powder and silica sol at 1500 ℃ in Ar. The NC is composed of single-crystal β-SiC core and amorphous SiO₂ sheath, with the length of hundreds of micrometers and the diameter of 60-80 nm. And the size of the core-shell can be adjusted by the holding time. The formation of the NC is explained based on the experimental data and the vapor-solid (VS) mechanism. The experiment results can also enrich the mechanism, and offer inspiration for their industrial-scale production.

Key words: SiC, nanocables, carbothermal reduction, catalyst-free

CLC Number:

TQ174

TIAN Zhao-Bo, CHEN Ke-Xin, SUN Si-Yuan, ZHANG Jie, CUI Wei, LIU Guang-Hua. Synthesis of SiC@SiO₂ Nanocables via a Catalyst-free Carbothermal Reduction Method[J]. Journal of Inorganic Materials, 2019, 34(11): 1217-1221.

Figures/Tables 6

Fig. 1 SEM images of core-shell SiC@SiO2 NC (a) Low-magnification image, with inset showing distribution of the SiC@SiO2 NC diameters; (b) High-magnification image, with inset showing the corresponding image of a single NC

Fig. 2 Typical XRD pattern obtained from the core-shell SiC@SiO2 NC

Fig. 3 TEM images of the core-shell SiC@SiO2 NC kept in 1500 ℃ for 4 (a) and 6 h (b), the corresponding SAED (c), and HRTEM image (d)

Fig. 4 Mapping mode of the EDS of the elements, Si/C/O in the NC

Fig. 5 Raman scattering spectrum of SiC@SiO2 core-shell NC

Fig. 6 Schematic illustration of the growth and morphology evolution of the SiC-SiO2 NC

References 29

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Synthesis of SiC@SiO₂ Nanocables via a Catalyst-free Carbothermal Reduction Method

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