Highly Porous Nanocrystalline UiO-66 Thin Films via Coordination Modulation Controlled Step-by-Step Liquid-Phase Growth

A.L. Semrau, Suttipong Wannapaiboon*, Sidharam P. Pujari, Pia Vervoorts, Bauke Albada, Han Zuilhof, Roland A. Fischer

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)

Abstract

Metal-organic frameworks (MOFs) possess exciting properties, which can be tailored by rational material design approaches. Integration of MOFs in functional nano- and mesoscale systems require selective crystallite positioning and thin-film growth techniques. Stepwise layer-by-layer liquid-phase epitaxy (LPE) emerged as one of the methods of choice to fabricate MOF@substrate systems. The layer-by-layer approach of LPE allows a precise control over the film thickness and crystallite orientation. However, these advantages were mostly observed in cases of tetra-connected dinuclear paddle-wheel MOFs and Hoffmann-type MOFs. Higher connected MOFs (consisting of nodes with 8-12 binding sites), such as the Zr-oxo cluster based families, are notoriously hard to deposit in an acceptable quality by the stepwise liquid-phase process. Herein, we report the use of coordination modulation (CM) to assist and enhance the LPE growth of UiO-66, Zr 6 O 4 (OH) 4 (bdc) 6 (bdc 2- = 1,4-benzene-dicarboxylate) films. Highly porous and crystalline thin films were obtained with good control of the crystallite domain size and film thickness in the nanoscale regime. The crystallinity (by grazing incidence X-ray diffraction), morphology (by scanning electron microscopy, atomic form microscopy), elemental composition (by X-ray photoelectron spectroscopy), binding properties (by infrared spectroscopy), and adsorption capacity (by quartz crystal microbalance adsorption experiments) for volatile organic compounds (e.g. CH 3 OH) of the fabricated thin films were investigated. These results substantiate a proof-of-concept of CM-LPE of MOFs and could be the gateway to facilitate in general the deposition of chemically very robust and higher-connected MOF thin films with automatic process-controlled LPE techniques under mild synthetic conditions.

Original languageEnglish
Pages (from-to)1738-1747
JournalCrystal Growth and Design
Volume19
Issue number3
DOIs
Publication statusPublished - Mar 2019

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