Synthesis of β-SiC nanostructures via the carbothermal reduction of resorcinol–formaldehyde/SiO2 hybrid aerogels
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The novel resorcinol–formaldehyde/SiO2 (RF/SiO2) hybrid aerogels were chosen to synthesize the cubic silicon carbide (β-SiC) nanostructures via a carbothermal reduction route. In this process, the in situ polymerized RF/SiO2 aerogels were used as both the silicon and carbon sources. The morphologies and structures of SiC nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and high-resolution transmission electron microscope (HRTEM) equipped with EDS. The effects of C/Si atomic ratios in RF/SiO2 aerogels and heat treatment temperatures on the formation of SiC nanomaterials were investigated in detail. It was shown that β-SiC nanowhiskers with diameters of 50–150 nm and high crystallinity were obtained at the temperatures from 1400 to 1500 °C. The role of the interpenetrating network of RF/SiO2 hybrid aerogels in the carbothermal reduction was discussed and a possible mechanism was proposed.
KeywordsResorcinol Carbothermal Reduction Hybrid Aerogel Saturated Electron Drift Velocity Direct Heat Treatment
This work was supported by the National Natural Science Foundation of China (50572003) and State Key Basic Research Program of China (2006CB9326022006).
- 28.Joint Committee on Powder Diffraction Standards (JCPDS) 29-1129Google Scholar