Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 30    No. 11    November 2020

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Synthesis and growth mechanism of SiC/SiO2 nanochains by catalyst-free thermal evaporation method in Ar/CO atmosphere
Xiang-min XIE1, Zhe-an SU1, Dong HUANG2, Cheng YANG1, Ya-feng WANG1, Ding-yu JIANG1, Qi-zhong HUANG1

1. National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials, Central South University, Changsha 410083, China;
2. Hunan Provincial Engineering Research Center for High Performance Pitch Based Carbon Materials, Hunan Toyi Carbon Material Technology Co., Ltd., Changsha 410205, China

Abstract:SiC/SiO2 nanochains were synthesized on a carbon fiber substrate by a catalyst-free thermal evaporation method in the Ar/CO atmosphere. X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that the as-synthesized SiC/SiO2 nanochains are composed of single-crystalline SiC nanowires and amorphous SiO2 beads. The introduction of CO can promote the formation of SiO2, so that the SiC/SiO2 nanochains are subsequently formed during cooling. In addition, the photoluminescence spectrum of SiC/SiO2 nanochains showed a broad emission peak at around 350 nm, which is ascribed to the oxygen discrepancy in the SiO2 beads as well as the SiC/SiO2 interfacial effect. These findings can provide guidance for further study of the vapor growth of 1D SiC-based materials.

 

Key words: synthesis; growth mechanism; SiC/SiO2 nanochains; thermal evaporation method; carbon monoxide; photoluminescence properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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