Xi Guangcheng, Yu Shijun, Zhang Rui, Zhang Meng, Ma Dekun, Qian Yitai
Hefei National Laboratory for Physical Science at Microscale, Department of Chemistry, University of Science & Technology of China, Hefei, Anhui 230026, PR China.
J Phys Chem B. 2005 Jul 14;109(27):13200-4. doi: 10.1021/jp051429l.
A novel nanostructure, cubic silicon carbide (3C-SiC) nanoparticles encapsulated in branched wavelike carbon nanotubes have been prepared by a reaction of 1,2-dimenthoxyethane (CH3OCH2CH2OCH3), SiCl4, and Mg in an autoclave at 600 degrees C. According to X-ray powder diffraction, the products are composed of 3C-SiC and carbon. TEM and HRTEM images show that the as-synthesized products are composed of 3C-SiC nanoparticles encapsulated in branched carbon nanotubes with wavelike walls. The diameter of the 3C-SiC cores is approximately 20-40 nm and the thickness of the carbon shells is about 3-5 nm. In Raman scattering spectroscopy, both the TO (Gamma) phonon line and the LO (Gamma) phonon line have red shifts about 6 cm(-1) relative to that for the bulk 3C-SiC. The photoluminescence (PL) spectrum shows that there are two emission peaks: blue light emission (431 nm) and violet light emission (414 nm). A sequential deposition growth process (with cores as the templates for the shells) for the nanostructure was proposed.
通过在600摄氏度的高压釜中使1,2 - 二甲氧基乙烷（CH3OCH2CH2OCH3）、SiCl4和Mg发生反应，制备出了一种新型纳米结构，即封装在分支状波状碳纳米管中的立方碳化硅（3C - SiC）纳米颗粒。根据X射线粉末衍射结果，产物由3C - SiC和碳组成。透射电子显微镜（TEM）和高分辨率透射电子显微镜（HRTEM）图像显示，合成后的产物由封装在具有波状壁的分支状碳纳米管中的3C - SiC纳米颗粒组成。3C - SiC核的直径约为20 - 40纳米，碳壳的厚度约为3 - 5纳米。在拉曼散射光谱中，TO（Gamma）声子线和LO（Gamma）声子线相对于块状3C - SiC都有大约6厘米^(-1)的红移。光致发光（PL）光谱显示有两个发射峰：蓝光发射（431纳米）和紫光发射（414纳米）。提出了该纳米结构的连续沉积生长过程（以核作为壳的模板）。
