Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, Japan.
Chem Asian J. 2012 Jun;7(7):1713-8. doi: 10.1002/asia.201200256. Epub 2012 May 3.
Mesoporous alumina films with large-sized cage-type mesopores were prepared by using commercially available diblock copolymer (PS-b-PEO) and economic inorganic salt (AlCl(3)) as aluminum source. The obtained mesopore sizes drastically expand from 35 nm to 80 nm when the amount of ethanol in the precursor solutions were controlled. More interestingly, under an optimized amount of ethanol as co-solvent, there was no significant change of micelle morphology on the substrate, even though the relative amount of PS-b-PEO to alumina source was dramatically varied. When the amount of alumina precursor was decreased, the pore walls gradually became thinner, thereby improving pore connectivity. The ordered mesoporous alumina films obtained in this study exhibit high thermal stability up to 1000 °C, and their frameworks are successfully crystallized to γ-alumina phase. This technique could also be applicable for creating other metal oxide thin films with large mesopores.
介孔氧化铝膜具有大笼型介孔，由市售两亲嵌段共聚物（PS-b-PEO）和经济无机盐（AlCl(3)）作为铝源制备。当前驱体溶液中的乙醇量得到控制时，所得介孔尺寸从 35nm 急剧扩展到 80nm。更有趣的是，在优化量的乙醇作为共溶剂的条件下，即使 PS-b-PEO 与氧化铝源的相对量有很大变化，在基底上的胶束形态也没有明显变化。当氧化铝前体的量减少时，孔壁逐渐变薄，从而提高了孔的连通性。本研究中获得的有序介孔氧化铝膜在高达 1000°C 时表现出高热稳定性，其骨架成功晶化为γ-氧化铝相。该技术还可用于制备具有大介孔的其他金属氧化物薄膜。
