Hollow Zn/Co Zeolitic Imidazolate Framework (ZIF) and Yolk-Shell Metal@Zn/Co ZIF Nanostructures.
Hollow Zn/Co Zeolitic Imidazolate Framework (ZIF) and Yolk-Shell Metal@Zn/Co ZIF Nanostructures.
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DOI：
10.1002/chem.201503619
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发表时间：
2016-03
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通讯作者：
Christoph Rösler;Arshad Aijaz;S. Turner;M. Filippousi;A. Shahabi;Wei Xia;G. van Tendeloo;M. Muhler-M.
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文献类型：
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作者：
Christoph Rösler;Arshad Aijaz;S. Turner;M. Filippousi;A. Shahabi;Wei Xia;G. van Tendeloo;M. Muhler-M.
金属有机骨架材料具有广阔的应用前景。具有可调孔隙率和纳米级多功能性的中空MOF结构具有有益的性质，期望其作为催化活性物质的主体。在本文中，我们证明了通过使用Zn-MOF（ZIF-8）在预形成的Co-MOF（ZIF-67）纳米晶体上的外延生长来形成良好限定的中空Zn/Co基沸石咪唑酯骨架（ZIF），所述纳米晶体涉及Co-MOF的原位自我牺牲/挖掘。此外，任何类型的金属纳米颗粒可以容纳在Zn/Co-ZIF壳中以产生蛋黄壳金属OZIF结构。透射电子显微镜和断层扫描研究揭示了这些纳米颗粒包含在中空Zn/Co-ZIF内，其中Zn-MOF占主导地位作为壳。我们的研究结果导致了这种中空系统的普遍化，这些中空系统有效地工作于其他类型的ZIF。
Metal-organic frameworks (MOFs) feature a great possibility for a broad spectrum of applications. Hollow MOF structures with tunable porosity and multifunctionality at the nanoscale with beneficial properties are desired as hosts for catalytically active species. Herein, we demonstrate the formation of well-defined hollow Zn/Co-based zeolitic imidazolate frameworks (ZIFs) by use of epitaxial growth of Zn-MOF (ZIF-8) on preformed Co-MOF (ZIF-67) nanocrystals that involve in situ self-sacrifice/excavation of the Co-MOF. Moreover, any type of metal nanoparticles can be accommodated in Zn/Co-ZIF shells to generate yolk-shell metal@ZIF structures. Transmission electron microscopy and tomography studies revealed the inclusion of these nanoparticles within hollow Zn/Co-ZIF with dominance of the Zn-MOF as shell. Our findings lead to a generalization of such hollow systems that are working effectively to other types of ZIFs.