Citation: ZHAO Chun-Rong, YANG Juan-Yu, LU Shi-Gang. Preparation of SiC Nanowires by Direct Electro-reduction of SiO2/C Pellets in Molten Salt[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(12): 2543-2548. doi: 10.3969/j.issn.1001-4861.2013.00.371
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Silicon carbide nanowires were synthesized by mixing formaldehyde resin carbon and nanometer silicon dioxide (atomic Si/C ratio, 1∶1) under cell voltage of 2.0 V in molten CaCl2 at 900 ℃. The morphology, structure and chemical composition of the samples prepared by electro-reduction method were characterized by field-emission scanning electron microscopy (FE-SEM), transmission electronic microscope (TEM), High-resolution transmission electron microscopy (HRTEM) coupled with electron energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and laser Raman spectroscopy. The results reveal that silicon carbide nanowires are crystalline with a cube structure, the diameter is distributed from 4 nm to 13 nm and the length is generally several micrometers. Two broad photoluminescence (PL) peaks at the center wavelength of about 415 nm and 534 nm were observed at room temperature. The formation mechanism of the SiC nanowires is also discussed.
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