A Rational Repeating Template Method for Synthesis of 2D Hexagonally Ordered Mesoporous Precious Metals
A Rational Repeating Template Method for Synthesis of 2D Hexagonally Ordered Mesoporous Precious Metals
复制标题
DOI：
10.1002/asia.201000674
复制
发表时间：
2011-03-01
影响因子：
4.1
通讯作者：
Kuroda, Kazuyuki
中科院分区：
文献类型：
--
作者：
Takai, Azusa;Doi, Yoji;Kuroda, Kazuyuki
提出了一种用于合成具有二维六边形介观结构的介孔金属的重复模板方法。首先，使用二维六方有序介孔碳作为模板制备二氧化硅复制品（即周期性排列的二氧化硅纳米棒）。之后，将获得的二氧化硅复制品用作制备介孔钌的第二模板。将钌物质引入到二氧化硅复制品中后，然后使用还原剂二甲胺硼烷通过气相渗透法还原钌物质。钌沉积后，用化学方法去除二氧化硅。通过透射电子显微镜和扫描电子显微镜、氮吸附脱附等温线和小角X射线散射的分析表明，介孔钌具有二维六边形介观结构，尽管与原始介孔碳模板相比，介孔结构有序性有所下降。该方法广泛适用于其他金属体系。通过改变引入二氧化硅复制品中的金属种类，可以合成几种介孔金属（钯和铂）。可以制备软模板方法不易获得的有序介孔钌和钯。这项研究克服了软模板方法的成分变化限制。
A repeating template method is presented for the synthesis of mesoporous metals with 2D hexagonal mesostructures. First, a silica replica (i.e., silica nanorods arranged periodically) is prepared by using 2D hexagonally ordered mesoporous carbon as the template. After that, the obtained silica replica is used as the second template for the preparation of mesoporous ruthenium. After the ruthenium species are introduced into the silica replica, the ruthenium species are then reduced by a vapor-infiltration method by using the reducing agent dimethylamine borane. After the ruthenium deposition, the silica is chemically removed. Analysis by transmission and scanning electron microscopies, a nitrogen-adsorption-desorption isotherm, and small-angle X-ray scattering revealed that the mesoporous ruthenium had a 2D hexagonal mesostructure, although the mesostructural ordering is decreased compared to that of the original mesoporous carbon template. This method is widely applicable to other metal systems. By changing the metal species introduced into the silica replica, several mesoporous metals (palladium and platinum) can be synthesized. Ordered mesoporous ruthenium and palladium, which are not easily attainable by the soft-templating methods, can be prepared. This study has overcome the composition variation limitations of the soft-templating method.