Synthesis and formation mechanism of textured MOF-5
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Textured and house-of-card structures develop on the surfaces of cubic MOF-5 crystals. The formation mechanism of these novel constructions are investigated based on characterisation of the intermediate specimens with different reaction time intervals using scanning and transmission electron microscopies. It is found that the growth of MOF-5 cubic crystals does not follow the classical route. MOF-5 nanocrystallites initially aggregate to form large polycrystalline cubes, followed by surface re-arrangement of the nanocrystallites into a textured structure consisting of nanowires lying along the , ,  and [11 ̅0] zone axes, if the face of the cube is defined to be (001). Further crystal growth leads to a house-of-cards structure constructed by interpenetrated nanoplates with their shortest axis parallel to  and [11 ̅0] axes. Evidence of a reversed crystal growth process is also observed. MOF-5 cubes with a single crystal-like appearance are achieved with extended reaction times despite their hidden three tier structure containing varying porosities hidden underneath.
Greer , H F , Liu , Y , Greenaway , A , Wright , P A & Zhou , W 2016 , ' Synthesis and formation mechanism of textured MOF-5 ' Crystal Growth & Design , vol 16 , no. 4 , pp. 2104-2111 . DOI: 10.1021/acs.cgd.5b01785
Crystal Growth & Design
Copyright © 2016 American Chemical Society. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://dx.doi.org/10.1021/acs.cgd.5b01785
HFG and WZ would like to thank the EPSRC for financial support on FEG-SEM equipment (EP/F019580/1) and a Platform (EP/K015540/1).
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