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Generation of self-assembled 3D mesostructured SnO2 thin films with highly crystalline frameworks

机译：具有高度结晶骨架的自组装3D介观结构SnO2薄膜的生成

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摘要

Crack-free, mesoporous SnO2 films with highly crystalline pore walls are obtained by evaporation-induced self-assembly using a novel amphiphilic block-copolymer template ("KLE" type, poly(ethylene-co-butylene)-block-poly(ethylene oxide)), which leads to well-defined arrays of contracted spherical mesopores by suitable heat-treatment procedures. Because of the improved templating properties of these polymers, a facile heat-treatment procedure can be applied whilst keeping the mesoscopic order intact up to 600-650 degrees C. The formation mechanism and the mesostructural evolution are investigated. by various state-of-the-art techniques, particularly by a specially constructed 2D small-angle X-ray scattering setup. It is found that the main benefit from the polymers is the formation of an ordered mesostructure under the drastic conditions of using molecular Sn precursors (SnCl4), taking advantage of the large segregation strength of these amphiphiles. Furthermore, it is found that the crystallization mechanism is different from other mesostructured metal oxides such as TiO2. In the case of SnO2, a significant degree of crystallization (induced by heat treatment) already starts at quite low temperatures, 250-300 degrees C. Therefore, this study provides a better understanding of the general parameters governing the preparation of mesoporous metal. oxides films with crystalline pore walls.
机译：使用新型两亲嵌段共聚物模板（“ KLE”型，聚（乙烯-共-丁烯）-嵌段-聚（环氧乙烷），通过蒸发诱导自组装获得具有高结晶度孔壁的无裂纹，中孔SnO2薄膜）），通过适当的热处理程序可产生排列清晰的球形中孔收缩阵列。由于这些聚合物的模板性能得到改善，因此可以在不超过600-650摄氏度的范围内保持介观秩序完整的前提下，采用简便的热处理程序。研究了形成机理和介观结构的演变。通过各种最新技术，特别是通过特殊构造的2D小角度X射线散射设置。已经发现，利用这些两亲物的高分离强度，在使用分子锡前体（SnCl4）的剧烈条件下，聚合物的主要好处是形成有序的介孔结构。此外，发现结晶机理不同于其他介孔结构的金属氧化物如TiO 2。在SnO2的情况下，相当大的结晶度（由热处理引起）已经在250-300摄氏度的相当低的温度下开始。因此，本研究可以更好地理解控制介孔金属制备的一般参数。氧化膜具有结晶孔壁。

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