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

Abstract Core-shell structured SiC@SiO 2 nanowires and Si@SiO were prepared on the surface of carbon/carbon (C/C) composites by a thermal evaporation method using SiO powders as silicon source Ni(NO 3 ) catalyst. The average diameters are about 145 nm, core-shell diameter ratios 0.41 0.53, respectively. SiO2 shells such two resulted from reaction between CO itself, respectively, based model analysis. growth these conformed to vapor—liquid—solid (VLS) mode. In this mode, played an important role in nanowires. There existed critical partial pressure ( p C determining microstructure evolution into whether or . value was calculated be 4.01×10 −15 Pa thermodynamic computation. Once system greater than , tended react with CO, causing formation However, decomposition predominant products mainly consisted This work may helpful for regulation process understanding mechanism silicon-based