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  • Title: Crystalline silicon carbide nanoparticles encapsulated in branched wavelike carbon nanotubes: synthesis and optical properties.
    Author: Xi G, Yu S, Zhang R, Zhang M, Ma D, Qian Y.
    Journal: J Phys Chem B; 2005 Jul 14; 109(27):13200-4. PubMed ID: 16852645.
    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.
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