Self-Directed Localization of ZIF-8 Thin Film Formation by Conversion of ZnO Nanolayers
Self-Directed Localization of ZIF-8 Thin Film Formation by Conversion of ZnO Nanolayers
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DOI：
10.1002/adfm.201400559
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发表时间：
2014-08-13
影响因子：
19
通讯作者：
Fischer, Roland A.
中科院分区：
文献类型：
--
作者：
Khaletskaya, Kira;Turner, Stuart;Fischer, Roland A.
局部金属有机骨架（MOF）薄膜形成的控制是一个挑战。沸石咪唑酯骨架（ZIF）是基于过渡金属和咪唑酯连接基的M0 F的重要子类。共生ZIF晶体的连续涂层需要高速率的异质成核。在这项工作中，使用通过原子层沉积（ALD）或通过磁控溅射获得的涂覆有氧化锌层的衬底，以提供ZIF-8膜（[Zn（mim）（2）]; Hmim = 2-甲基咪唑）的成核和局部生长所需的Zn 2+离子。所获得的ZIF-8膜揭示了预期的微孔性，如从使用环境控制的石英晶体微天平（QCM）的甲醇吸附研究以及与散装ZIF-8参考数据的比较所推断的。该概念可转移到其他MOFs，并被应用于形成[Al（OH）（1，4-ndc）]（n）（ndc = naphthalenedicarboxylate）薄膜衍生自Al 2 O3纳米层。
Control of localized metal-organic framework (MOF) thin film formation is a challenge. Zeolitic imidazolate frameworks (ZIFs) are an important sub-class of MOFs based on transition metals and imidazolate linkers. Continuous coatings of intergrown ZIF crystals require high rates of heterogeneous nucleation. In this work, substrates coated with zinc oxide layers are used, obtained by atomic layer deposition (ALD) or by magnetron sputtering, to provide the Zn2+ ions required for nucleation and localized growth of ZIF-8 films ([Zn(mim)(2)]; Hmim = 2-methylimidazolate). The obtained ZIF-8 films reveal the expected microporosity, as deduced from methanol adsorption studies using an environmentally controlled quartz crystal microbalance (QCM) and comparison with bulk ZIF-8 reference data. The concept is transferable to other MOFs, and is applied to the formation of [Al(OH)(1,4-ndc)](n) (ndc = naphtalenedicarboxylate) thin films derived from Al2O3 nanolayers.