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Hollow Zn/Co Zeolitic Imidazolate Framework (ZIF) and Yolk-Shell Metal@Zn/Co ZIF Nanostructures

机译:空心Zn / Co沸石咪唑盐骨架(ZIF)和蛋黄壳金属@ Zn / Co ZIF纳米结构

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摘要

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.
机译:金属有机框架(MOF)具有广泛的应用前景。期望具有在纳米级具有可调的孔隙率和多功能性且具有有益特性的空心MOF结构作为催化活性物质的主体。在本文中,我们演示了通过在预成型的Co-MOF(ZIF-67)纳米晶体上外延生长Zn-MOF(ZIF-8),形成明确定义的中空Zn / Co基沸石咪唑酸盐骨架(ZIFs)。 Co-MOF的原位自我牺牲/发掘。而且,任何类型的金属纳米粒子都可以容纳在Zn / Co-ZIF壳中,以产生卵黄壳金属@ZIF结构。透射电子显微镜和断层扫描研究表明,这些纳米颗粒包含在空心Zn / Co-ZIF中,并且以Zn-MOF为主体。我们的发现导致了对这些中空系统的推广,这些中空系统可有效地应用于其他类型的ZIF。

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