title: Crystalline silicon carbide nanoparticles encapsulated in branched wavelike carbon nanotubes: synthesis and optical properties.
abstract: 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.
authors.affiliation: Hefei National Laboratory for Physical Science at Microscale, Department of Chemistry, University of Science & Technology of China, Hefei, Anhui 230026, PR China.
authors.forename: Guangcheng
authors.initials: G
authors.lastname: Xi
authors.forename: Shijun
authors.initials: S
authors.lastname: Yu
authors.forename: Rui
authors.initials: R
authors.lastname: Zhang
authors.forename: Meng
authors.initials: M
authors.lastname: Zhang
authors.forename: Dekun
authors.initials: D
authors.lastname: Ma
authors.forename: Yitai
authors.initials: Y
authors.lastname: Qian