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

Author:
Zhang, Xiong-Fei, Chen, Zhouyuan, Feng, Yi, Qiu, Jianhao, Yao, Jianfeng
Source:
ACS sustainable chemistry & engineering 2018 v.6 no.1 pp. 1068-1073
ISSN:
2168-0485
Subject:
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
Abstract:
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.
Agid:
5988633