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Issue 45, 2019
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ZIF-8 self-etching method for Au/polydopamine hybrid cubic microcapsules with modulated nanostructures

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Abstract

Metal–organic framework (MOF)-derived nanostructures exhibit wonderful characteristics and possess broad application potential by modulating the complex composition and inner nanostructure. Although various MOF-based nanocomposites have been successfully developed, a facile method that can easily modulate the structure-dependent chemical components of the MOF-derived hybrids remains a challenge. By coating zeolitic imidazolate framework-8 (ZIF-8) with Au/polydopamine (Au/PDA) via in situ redox-oxidation polymerization of HAuCl4 and dopamine, it was found that the ZIF-8 templates were simultaneously etched off to give Au/PDA hybrid microcapsules with a cubic shape. This one-step sacrificial templating process followed a competing chelation between gold ions and Zn2+ cations to 2-methylimidazole and PDA; thus, both the hollow and the yolk-like hybrid cubic microcapsules were controllably obtained by varying the synthetic dynamics. Owing to the hollow nature, penetrated PDA shell, well-distributed Au nanocrystals, and unique stable nanostructure, the non-spherical Au/PDA hybrid cubic microcapsules showed high performance in catalyzing the reduction of 4-nitrophenol as well as adsorption/release of ibuprofen as a model drug. Moreover, this simple strategy offers a controllable design in developing multifunctional nanocomposites with definite inner nanostructures and activities for nanocatalysis, drug delivery, energy storage etc.

Graphical abstract: ZIF-8 self-etching method for Au/polydopamine hybrid cubic microcapsules with modulated nanostructures

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Publication details

The article was received on 10 Sep 2019, accepted on 08 Oct 2019 and first published on 10 Oct 2019


Article type: Paper
DOI: 10.1039/C9CE01426H
CrystEngComm, 2019,21, 6935-6944

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    ZIF-8 self-etching method for Au/polydopamine hybrid cubic microcapsules with modulated nanostructures

    Q. Fang, Y. Sun, J. Duan, L. Bai, K. Xu, Q. Xiong, H. Xu, K. C. Leung, A. Hui and S. Xuan, CrystEngComm, 2019, 21, 6935
    DOI: 10.1039/C9CE01426H

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