Large scale synthesis and photoluminescence properties of necklace-like SiC/SiOx heterojunctions via a molten salt mediated vapor reaction technique
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- 作者：Wei Li ; Quanli Jia ; jiaquanli@zzu.edu.cn ; Xinhong Liu ; Ju Zhang
- 关键词：SiC/SiOx heterojunctions ; Chemical vapor reaction ; Molten salt mediated ; Photoluminescece properties ; Core-shell
- 刊名：Ceramics International
- 出版年：2017
- 出版时间：15 February 2017
- 年：2017
- 卷：43
- 期：3
- 页码：2950-2955
- 全文大小：989 K
- 卷排序：43
文摘
Necklace-like SiC/SiOx heterojunctions were synthesized by a simplified vapor reaction technique using silicon powders as raw material without metallic catalyst or flowing gas at 1200 °C. Phase composition, morphology and microstructural characteristics of as-achieved products were characterized. The as-synthesized SiC/SiOx heterojunctions, up to millimeters in length, are composed of SiC/SiO2 core–shell chains with diameters of 0.3–1 µm and amorphous SiO2 beans with diameters of 2–5 µm. The growth mechanism of the as-synthesized SiC/SiO2 core–shell chains is most likely controlled by vapor–solid mechanism. The formation of SiO2 beans can be mainly attributed to the Rayleigh instability and surface tension. The photoluminescence spectra of the as-received products exhibit a significant violet-blue emission, making a potential application in violet-blue emitting devices.