Synthesis of β-SiC Nanostructures via the Carbothermal Reduction of RF/SiO2 Hybrid Aerogels
Cubic silicon carbide (β-SiC) nanostructures have been synthesized via a carbothermal reduction route by using a novel resorcinol-formaldehyde/SiO2 (RF/SiO2) hybrid aerogels as both silicon and carbon source materials.The precursor and its prepared SiC nanostrucures were analyzed by X-ray powder diffraction (XRD), high-resolution scanning electron microscopy (HRSEM), high-resohition transmission electron microscopy (HRTEM) equipped with EDS, and Thermogravimetfic analysis (TG).The XRD patterns show that the β-SiC products after purification possessed a high crystallinity.From HRSEM results we can see the SiC whiskers have a diameter in the range of 50～150nm and was a little etched after mixed acid treatment.HRTEM and EDS analysis confirm the high purity the product.The formation process of β-SiC nanostmctures involves a Vapor-Solid (V-S) growth process.According to the obtained results, the role of the interpenetrating network in the carbothennal reduction of RF/SiO2 hybrid aerogels was discussed and thus a possible mechanism was expatiated.
Silicon carbide Carbothennal reduction Aerogels V-S process
Li Xin-tong Song Huai-he Chen Xiao-hong
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing100029, China
国内会议
太原
英文
93-99
2008-07-23（万方平台首次上网日期，不代表论文的发表时间）