核壳结构SiC/SiO2纳米线的低温合成与表征

doi:10.3724/SP.J.1077.2013.12725

无机材料学报 ›› 2013, Vol. 28 ›› Issue (9): 971-976.DOI: 10.3724/SP.J.1077.2013.12725 CSTR: 32189.14.SP.J.1077.2013.12725

核壳结构SiC/SiO₂纳米线的低温合成与表征

赵春荣, 杨娟玉, 丁海洋, 卢世刚

(北京有色金属研究总院, 北京100088)

收稿日期:2012-11-30 修回日期:2013-02-04 出版日期:2013-09-20 网络出版日期:2013-08-14
作者简介:赵春荣(1978-), 女, 博士. E-mail:zhaocr04@sohu.com
基金资助:
国家863计划(2012AA110102); 国家自然科学基金(51004016, 51004017)

Synthesis and Characterization of Core-shell SiC/SiO₂ Nanowires at Low Temperature

ZHAO Chun-Rong, YANG Juan-Yu, DING Hai-Yang, LU Shi-Gang

(General Research Institute for Nonferrous Metals, Beijing 100088, China)

Received:2012-11-30 Revised:2013-02-04 Published:2013-09-20 Online:2013-08-14
About author:ZHAO Chun-Rong. E-mail:zhaocr04@sohu.com
Supported by:
863 program(2012AA110102); National Natural Science Foundation of China(51004016; 51004017)

摘要/Abstract

摘要： 以酚醛树脂(PF)作为碳源, 纳米SiO₂为硅源, 在1300℃氩气气氛下通过碳热还原反应, 制备出具有核壳结构的SiC/SiO₂纳米线。采用X射线分析衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、高分辨率透射电子显微镜(HRTEM)、拉曼光谱(Raman)对产物的组成、形貌、微观结构等进行了表征。结果表明; SiC/SiO₂纳米线长可达数毫米, 单根SiC/SiO₂纳米线由直径30 nm的β-SiC晶体为内核和厚度约12 nm的无定形SiO₂壳层组成; 室温下SiC/SiO₂纳米线的PL发光峰与β-SiC单晶的发光特征峰相比有蓝移。最后, 讨论了核壳结构SiC/SiO₂纳米线的生成机制。

关键词: SiC/SiO₂核壳结构纳米线, 碳热还原, 酚醛树脂; 光致发光

Abstract: Core-shell SiC/SiO₂ nanowires were synthesized with formaldehyde resin as the carbon source and SiO₂ nano-powder as the silicon source at 1300℃ under argon atmosphere via the carbothermal reduction. The component, morphology and structure of the synthesized core-shell nanowires were systematically studied by X-ray diffraction, scanning electron microscope, transmission electronic microscope, high-resolution transmission electron microscope, and Raman spectroscope. The results show that the synthesized products are high-purity nanowires and it is found that the nanowires are quite uniform. The length of the nanowires can reach several millimeters, and the core-shell SiC/SiO₂ nanowires consist of a single crystalline β-SiC core with a diameter of about 30 nm and a uniform amorphous SiO₂ outer shell with a thickness of 12 nm. Compared to the single crystalline β-SiC, the emission spectrum from the photoluminescence of the as-synthesized core-shell SiC/SiO₂ nanowires has blueshift at room temperature. The formation mechanism of the core-shell SiC/SiO₂ nanowires is also discussed. The SiC core is grown in high temperature based on the vapor-solid mechanism. During cooling, the amorphous SiO₂ shell is formed by the reaction between SiO and CO gas.

Key words: core-shell SiC/SiO₂ nanowires, carbothermal reduction reaction, formaldehyde resin, photoluminescence

中图分类号:

TQ129

赵春荣, 杨娟玉, 丁海洋, 卢世刚. 核壳结构SiC/SiO₂纳米线的低温合成与表征[J]. 无机材料学报, 2013, 28(9): 971-976.

ZHAO Chun-Rong, YANG Juan-Yu, DING Hai-Yang, LU Shi-Gang. Synthesis and Characterization of Core-shell SiC/SiO₂ Nanowires at Low Temperature[J]. Journal of Inorganic Materials, 2013, 28(9): 971-976.

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核壳结构SiC/SiO₂纳米线的低温合成与表征

Synthesis and Characterization of Core-shell SiC/SiO₂ Nanowires at Low Temperature

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