Self‐Directed Localization of ZIF‐8 Thin Film Formation by Conversion of ZnO Nanolayers |
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| Authors: | Kira Khaletskaya Stuart Turner Min Tu Suttipong Wannapaiboon Andreas Schneemann Robert Meyer Alfred Ludwig Gustaaf Van Tendeloo Roland A. Fischer |
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| Affiliation: | 1. Department of Inorganic Chemistry II, Ruhr‐University‐Bochum, Bochum, Germany;2. Electron Microscopy for Materials Science (EMAT), University of Antwerp, Antwerp, Belgium;3. Chair for MEMS Materials and Materials Research Department, Ruhr‐University‐Bochum, Bochum, Germany |
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| Abstract: | 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. |
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| Keywords: | zeolitic imidazolate metal oxide films localized film growth quartz crystal microbalance nanolayers ZnO |
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