Preparation of amino-functionalized mesoporous silica thin films with highly ordered large pore structures

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• 作者：Xueao Zhang ; Jianfang Wang ; Wenjian Wu ; Changli Liu and Siwen Qian
• 关键词：Mesoporous silica ; Thin films ; Amino group ; Sol– ; gel ; Cytochrome c
• 刊名：Journal of Sol-Gel Science and Technology
• 出版年：2007
• 出版时间：September, 2007
• 年：2007
• 卷：43
• 期：3
• 页码：305-311
• 全文大小：439 KB

文摘

Highly ordered amino-functionalized mesoporous silica thin films have been directly synthesized by co-condensation of tetraethoxysilane (TEOS) and 3-aminopropyltriethoxysilane (APTES) in the presence of triblock copolymer Pluronic P123 surfactant species under acidic conditions by sol-gel dip-coating. The effect of the sol aging on thin films organization is systematically studied, and the optimal sol aging time is obtained. The amino-functionalized mesoporous silica thin films exhibit a long-range ordering of 2D hexagonal (p6mm) mesostructure with a large pore size of 8.3 nm, a large Brunauer–Emmett–Teller (BET) specific surface area of 680 m2 g−1 and a large pore volume of 1.06 cm3 g−1 following surfactant extraction as demonstrated by X-ray diffraction (XRD), Transmission electron microscope (TEM), and physical adsorption techniques. Based on BET surface area and weight loss, the surface coverage of amino-groups for the amino-functionalized mesoporous silica thin films is calculated to be 3.2 amino-groups per nm2. Moreover, the functionalized thin films display improved properties for immobilization of cytochrome c in comparison with pure-silica mesoporous thin films.