中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 30 No. 11 November 2020 |
（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
