Synthesis of β-SiC/SiO2 core-shell nanowires with the assistance of cerium oxide
来源期刊：JOURNAL OF RARE EARTHS2010年第3期
论文作者：于伟鹏 郑瑛 杨娥 邱健斌 兰瑞芳
文章页码：365 - 368
摘 要：The β-SiC/SiO2 core-shell nanowires with the "stem-and-node" structure were synthesized in the presence of cerium oxide by the carbothermal reduction of the starch-SiO2 hybrids gel.The samples were characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,high-resolution transmission electron microscopy（HRTEM） and energy-dispersed X-ray（EDX）.The results showed that the nanowires consisted of a 20-35 nm diameter crystalline β-SiC core wrapped with a 2-5 nm amorphous SiO2 shell,with their lengths up to several micrometers.The axes of nanowires lay along the [111] direction with a clean surface possessing a high density of planar defects.Base on the experimental results,it was suggested that the novel β-SiC/SiO2 core-shell coaxial nanowires with the "stem-and-node" structure were formed via the Vapor-liquid-solid（VLS） growth mechanism.
于伟鹏，郑瑛，杨娥，邱健斌，兰瑞芳
College of Chemistry and Materials Science,Fujian Normal University
摘 要：The β-SiC/SiO2 core-shell nanowires with the "stem-and-node" structure were synthesized in the presence of cerium oxide by the carbothermal reduction of the starch-SiO2 hybrids gel.The samples were characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,high-resolution transmission electron microscopy（HRTEM） and energy-dispersed X-ray（EDX）.The results showed that the nanowires consisted of a 20-35 nm diameter crystalline β-SiC core wrapped with a 2-5 nm amorphous SiO2 shell,with their lengths up to several micrometers.The axes of nanowires lay along the [111] direction with a clean surface possessing a high density of planar defects.Base on the experimental results,it was suggested that the novel β-SiC/SiO2 core-shell coaxial nanowires with the "stem-and-node" structure were formed via the Vapor-liquid-solid（VLS） growth mechanism.
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