Crystalline silicon carbide nanoparticles encapsulated in branched wavelike carbon nanotubes: Synthesis and optical properties

Guangcheng Xi, Shijun Yu, Rui Zhang, Meng Zhang, Dekun Ma, Yitai Qian

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

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 (CH3OCH2CH 2OCH3), SiCl4, and Mg in an autoclave at 600°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 (Γ) phonon line and the LO (Γ) 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.

Original languageEnglish (US)
Pages (from-to)13200-13204
Number of pages5
JournalJournal of Physical Chemistry B
Volume109
Issue number27
DOIs
StatePublished - Jul 14 2005

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