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Research Article | Open Access

Microstructure evolution and growth mechanism of core–shell silicon-based nanowires by thermal evaporation of SiO

Bing LIUJia SUN( )Lei ZHOUPei ZHANGChenxin YANQiangang FU( )
State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials, Northwestern Polytechnical University, Xi’an 710072, China
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Graphical Abstract

Abstract

Core–shell structured SiC@SiO2 nanowires and Si@SiO2 nanowires were prepared on the surface of carbon/carbon (C/C) composites by a thermal evaporation method using SiO powders as the silicon source and Ni(NO3)2 as the catalyst. The average diameters of SiC@SiO2 nanowires and Si@SiO2 nanowires are about 145 nm, and the core–shell diameter ratios are about 0.41 and 0.53, respectively. The SiO2 shells of such two nanowires resulted from the reaction between SiO and CO and the reaction of SiO itself, respectively, based on the model analysis. The growth of these two nanowires conformed to the vapor–liquid–solid (VLS) mode. In this mode, CO played an important role in the growth of nanowires. There existed a critical partial pressure of CO (pC) determining the microstructure evolution of nanowires into whether SiC@SiO2 or Si@SiO2. The value of pC was calculated to be 4.01×10−15 Pa from the thermodynamic computation. Once the CO partial pressure in the system was greater than the pC, SiO tended to react with CO, causing the formation of SiC@SiO2 nanowires. However, the decomposition of SiO played a predominant role and the products mainly consisted of Si@SiO2 nanowires. This work may be helpful for the regulation of the growth process and the understanding of the growth mechanism of silicon-based nanowires.

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Journal of Advanced Ceramics
Pages 1417-1430
Cite this article:
LIU B, SUN J, ZHOU L, et al. Microstructure evolution and growth mechanism of core–shell silicon-based nanowires by thermal evaporation of SiO. Journal of Advanced Ceramics, 2022, 11(9): 1417-1430. https://doi.org/10.1007/s40145-022-0620-4

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Received: 29 January 2022
Revised: 13 May 2022
Accepted: 28 May 2022
Published: 18 August 2022
© The Author(s) 2022.

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