Large scale synthesis and photoluminescence properties of necklace-like SiC/SiOx heterojunctions via a molten salt mediated vapor reaction technique

作者：Li, Wei; Jia, Quanli^*; Liu, Xinhong; Zhang, Ju

来源：Ceramics International, 2017, 43(3): 2950-2955.

DOI：10.1016/j.ceramint.2016.11.044

• SiC/SiOx heterojunctions
• Chemical vapor reaction
• Molten salt mediated
• Photoluminescece properties
• Core-shell

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 degrees 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 mu m and amorphous SiO2 beans with diameters of 2-5 mu m. 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.

• 出版日期2017-2-15
• 单位郑州大学