Morphology phase diagram of ultrathin anatase TiO2 films templated by a single PS-b-PEO block copolymer
Morphology phase diagram of ultrathin anatase TiO2 films templated by a single PS-b-PEO block copolymer
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DOI：
10.1021/ja0562853
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发表时间：
2006-04-12
影响因子：
15
通讯作者：
Gutmann, JS
中科院分区：
文献类型：
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作者：
Cheng, YJ;Gutmann, JS
以两亲性聚苯乙烯-嵌段聚环氧乙烷（PS-b-PEO）二嵌段共聚物为结构导向剂，采用溶胶-凝胶化学方法在Si（100）衬底上制备了形貌丰富的超薄TiO2薄膜。嵌段共聚物在1,4-二氧六环、浓盐酸（HCI）和四异丙醇钛（TTIP）的混合溶液中进行了好-差溶剂对诱导的相分离。通过调整1,4-二恶烷、HCI和TTIP的质量分数，可以得到多种不同形貌的无机嵌段共聚物复合膜。在此基础上，绘制了形貌的三元相图。通过煅烧制备锐钛矿型TiO2薄膜。利用原子力显微镜（AFM）、扫描电镜（SEM）和x射线衍射仪（XRD）对膜的形貌和晶相进行了研究，并对不同形貌的形成机理进行了探讨。
Ultrathin TiO2 films showing rich morphologies are prepared on Si(100) substrates using sol-gel chemistry coupled with an amphilic polystyrene-block-poly(ethylene oxide) (PS-b-PEO) diblock copolymer as a structure-directing agent. The block copolymer undergoes a good-poor solvent pair induced phase separation in a mixed solution of 1,4-dioxane, concentrated hydrochloric acid (HCI), and titanium tetraisopropoxide (TTIP). By adjusting the weight fractions of 1,4-dioxane, HCI, and TTIP, inorganic block copolymer composite films containing a variety of different morphologies are obtained. On the basis of the results a ternary phase diagram of the morphologies is mapped. By calcination, anatase TiO2 films are achieved. The morphologies and crystallographic phase of the films are studied with AFM, SEM, and XRD, respectively, and the formation mechanisms of the different morphologies are discussed.