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Issue 7, 2021
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Confined growth of MOF nanocrystals using a “locked” metal ion source

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Abstract

The controlled growth of MOF crystals in a confined space has long been a challenge. In this contribution, we present a facile strategy for the confined growth of MOF crystals in a mesoporous silica shell by pre-installing a metal stock inside the cavity while transporting organic linkers through the permeable shell. Remarkably, the size and shape of the confined MOF crystals could be controlled effectively by adjusting the synthesis parameters. The obtained MOF@mSiO2 composites could further be functionalized with a range of surfactant-free metal nanoparticles (MNPs, e.g., Au, Pd, and Ag) via galvanic replacement reactions on the encapsulated Cu2O surface during a one-pot preparation. This led to ultrafine MNPs embedded within the MOF matrix. The construction of the MOF and the galvanic replacement reaction occurred on similar time scales, and the Cu2O cores are believed to play dual roles in the synthesis: (i) providing a source of copper ions for building MOFs, and (ii) serving as a reductant to form noble MNPs which in turn significantly accelerated the formation kinetics of MOF crystals (to within 1 minute). Furthermore, it was also demonstrated that the encapsulated MOFs/MNPs within the mSiO2 shells were highly accessible to the general gas/liquid molecules and exhibited excellent catalytic activity for several oxidation reactions.

Graphical abstract: Confined growth of MOF nanocrystals using a “locked” metal ion source

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Supplementary files

Article information


Submitted
23 Aug 2020
Accepted
05 Dec 2020
First published
08 Dec 2020

J. Mater. Chem. A, 2021,9, 3976-3984
Article type
Paper

Confined growth of MOF nanocrystals using a “locked” metal ion source

Z. Huang, L. Fan, B. Chen, S. Zhou, J. Huang, Q. Li and G. Zhan, J. Mater. Chem. A, 2021, 9, 3976
DOI: 10.1039/D0TA08285F

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