Low-Temperature Pseudomorphic Transformation of Ordered Hierarchical Macro-mesoporous SiO2/C Nanocomposite to SiC via Magnesiothermic Reduction

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• 作者：Yifeng Shi ; Fan Zhang ; Yong-Sheng Hu ; Xiaohong Sun ; Yichi Zhang ; Hyung Ik Lee ; Liquan Chen ; Galen D. Stucky
• 刊名：Journal of the American Chemical Society
• 出版年：2010
• 出版时间：April 28, 2010
• 年：2010
• 卷：132
• 期：16
• 页码：5552-5553
• 全文大小：163K
• 年卷期：v.132,no.16(April 28, 2010)
• ISSN：1520-5126

文摘

A magnesiothermic reduction synthesis approach is reported for direct conversion of SiO₂/C composite nanostructures to corresponding SiC materials without losing their nanostructure morphologies. Crystalline SiC materials can be obtained by this approach at a temperature as low as 600 °C, only approximately half of that applied in the generally used carbothermal reduction and preceramic polymer pyrolysis methods. An ordered hierarchical macro-mesoporous SiC material was synthesized for the first time as a demonstration. This pseudomorphic transformation can be regarded as a general synthesis method for different kinds of SiC nanostructures, and it can also be readily extended to other metal carbide materials as well as TiC.