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Low-Temperature Transformation of C/SiO2 Nanocomposites to β-SiC with High Surface Area

Zhang, Xiong-Fei, Chen, Zhouyuan, Feng, Yi, Qiu, Jianhao, Yao, Jianfeng
ACS sustainable chemistry & engineering 2018 v.6 no.1 pp. 1068-1073
Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, absorption, adsorption, carbon, electromagnetic radiation, furfuryl alcohol, nanocomposites, nanomaterials, nitrogen, porous media, reaction mechanisms, scanning electron microscopy, silicon carbide, surface area, temperature, thermogravimetry, transmission electron microscopy
Mesoporous silicon carbide (SiC) nanostructures were synthesized by magnesiothermic reduction of carbon–silica (C/SiO₂) nanocomposites at a low temperature of 700 °C by using furfuryl alcohol as the carbon source. The phase, morphology, and structure of the samples were characterized by a combination of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectra, X-ray photoelectron spectroscopy, thermogravimetric analysis, and N₂ adsorption. The starting C/SiO₂ composites exhibited an interpenetrating network and the resulting SiC preserved the mesoporous properties of the original templates. The SiC products were of β-SiC phase and showed a high surface area of 786 m²/g. The reaction mechanism and role of intermediate species (Mg₂Si) were explored in detail. Furthermore, the resulting β-SiC exhibits remarkable electromagnetic wave absorption performance with a minimum reflection loss of −17.2 dB and reflection loss bandwidth less than −10 dB of 3.7 GHz.