Rapid synthesis of ordered hexagonal mesoporous silica and their incorporation with Ag nanoparticles by solution plasma
Rapid synthesis of ordered hexagonal mesoporous silica and their incorporation with Ag nanoparticles by solution plasma
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DOI：
10.1016/j.materresbull.2012.04.040
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发表时间：
2012-10
影响因子：
5.4
通讯作者：
P. Pootawang;N. Saito;O. Takai;Sang-Yul Lee
中科院分区：
文献类型：
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作者：
P. Pootawang;N. Saito;O. Takai;Sang-Yul Lee
采用溶液等离子体法（SPP），以P123三嵌段共聚物/正硅酸乙酯（TEOS）混合物为原料，在酸性溶液中放电，快速合成了具有六方有序介孔结构的二氧化硅。此外，SPP用于银纳米粒子（AgNPs）掺入二氧化硅框架作为一个批次的过程中使用银银（AgNO 3）溶液作为前体。放电1 min后可清楚观察到浑浊的硅酸盐凝胶，3 min时形成白色沉淀。在介孔二氧化硅中观察到具有六方排列的介孔和AgNPs。X射线衍射图谱中有两个区域（2θ<2°和2θ=35-90°）对应于介孔氧化硅和Ag的介孔特征。与传统的溶胶-凝胶法制备的介孔氧化硅相比，溶液等离子体法制备的介孔氧化硅具有更大的比表面积和孔径。此外，银负载量的增加导致介孔二氧化硅的比表面积减小，孔径变化不明显。SPP不仅可以提高凝胶化时间，而且可以增加介孔二氧化硅的比表面积和孔径。
Rapid synthesis of silica with ordered hexagonal mesopore arrangement was obtained using solution plasma process (SPP) by discharging the mixture of P123 triblock copolymer/TEOS in acid solution. SPP, moreover, was utilized for Ag nanoparticles (AgNPs) incorporation in silica framework as one-batch process using silver nitrate (AgNO3) solution as precursor. The turbid silicate gel was clearly observed after discharge for 1min and the white precipitate formed at 3min. The mesopore with hexagonal arrangement and AgNPs were observed in mesoporous silica. Two regions of X-ray diffraction patterns (2θ<2° and 2θ=35–90°) corresponded to the mesoporous silica and Ag nanocrystal characteristics. Comparing with mesoporous silica prepared by a conventional sol–gel route, surface area and pore diameter of mesoporous silica prepared by solution plasma were observed to be larger. In addition, the increase in Ag loading resulted in the decrease in surface area with insignificant variation in the pore diameter of mesoporous silica. SPP could be successfully utilized not only to enhance gelation time but also to increase surface area and pore diameter of mesoporous silica.