Surfactant-mediated synthesis of a novel nanoporous carbon-silica composite
Surfactant-mediated synthesis of a novel nanoporous carbon-silica composite
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DOI：
10.1021/cm020965c
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发表时间：
2003-06
影响因子：
8.6
通讯作者：
Zheng‐Ming Wang;K. Hoshinoo;K. Shishibori;H. Kanoh;K. Ooi
中科院分区：
文献类型：
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作者：
Zheng‐Ming Wang;K. Hoshinoo;K. Shishibori;H. Kanoh;K. Ooi
采用表面活性剂插层预膨胀氧化石墨(GO)层间、正硅酸乙酯(−)插层及其在层间的水解、后碳化等一系列方法制备了具有中等亲水性的纳米多孔碳/硅胶复合材料。高分辨氮气吸附结果表明，在823K下碳化得到的复合材料具有最高的比表面积，超过1000m2/g，同时具有微孔率和介孔。漂移、核磁共振、X射线光电子能谱和拉曼光谱的各种分析结果表明，该复合材料的结构中含有较小的石墨烯片层，其硅组分为+4价的二氧化硅颗粒。形貌观察、热脱附等性质表明，GO在水溶液中的分散、GO层间的预膨胀、TEOS分子的层间水解以及碳化条件在反应中起着重要的作用。
A novel nanoporous carbon−silica composite with medium hydrophilicity is synthesized by a series of methods consisting of preexpansion of the interlayer of graphite oxide (GO) by surfactant intercalation, the intercalation of tetraethoxylsilane (TEOS) and its hydrolysis in the interlayer, followed by post carbonization to form a robust bridged/pillared network. High-resolution N2 adsorption results show that carbonization at 823 K gives a composite having the highest specific surface area of more than 1000 m2/g with both microporosity and mesoporosity. Varieties of analytical results using DRIFT, NMR, XPS, and RAMAN spectra indicate that this composite contains small graphene sheets in its structure and its silicon components are silica particles with +4 valence. Morphology observation, thermal desorption, and other properties suggest the important roles of dispersion of GO in aqueous solution, preexpansion of GO interlayer, interlayer hydrolysis of TEOS molecules, and the carbonization condition in the f...