Site-specific growth of MOF-on-MOF heterostructures with controllable nano-architectures: beyond the combination of MOF analogues.
Site-specific growth of MOF-on-MOF heterostructures with controllable nano-architectures: beyond the combination of MOF analogues.
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具有可控纳米结构的 MOF-on-MOF 异质结构的位点特异性生长：超越 MOF 类似物的组合
DOI：
10.1039/d0sc00417k
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发表时间：
2020-03-05
期刊：
影响因子：
8.4
通讯作者：
Yu C
中科院分区：
文献类型：
--
作者：
Liu C;Lin L;Sun Q;Wang J;Huang R;Chen W;Li S;Wan J;Zou J;Yu C
将不同的金属有机骨架(MOF)集成到一个系统中，导致了最近各种MOF-on-MOF杂化材料的组合创新；然而，控制它们在MOF类似物之外的特定部位的生长仍然具有挑战性。在这项工作中，开发了一种特定位置的外延生长策略来合成由两个完全不同成分的MOF组成的MOF-on-MOF异质结。客体MOF(ZIF-8)外延生长在宿主MOF(MIL-125)的特定{110}面上。此外，ZIF-8在MIL-125上的生长位置也可以通过使用在角表面或侧面露出{110}面的MIL-125主机来选择。从而合成了两种精心设计的不同结构的MIL-125@ZIF-8异质结。由于ZIF-8的高吸附能力和MIL-125的光催化活性，MIL-125@ZIF-8异质结构与单一的MOF亚基相比表现出协同增强的光催化性能。此外，MIL-125@ZIF-8异质结的拐角生长比侧面生长具有更高的活性。我们的贡献为利用晶体工程方法合理设计具有可调组成和纳米结构的复合MOF铺平了道路。采用定点外延生长的方法合成了两种具有精心设计结构的MOF-on-MOF异质结，它们由两种成分完全不同的MOF组成。
The integration of different metal–organic frameworks (MOFs) into one system has led to the recent combinatorial innovation of various MOF-on-MOF hybrids; however control over their site-specific growth beyond MOF analogues remains challenging. In this work, a site-specific epitaxial-growth strategy is developed to synthesize MOF-on-MOF heterostructures comprised of two MOFs with totally different compositions. A guest MOF (ZIF-8) is epitaxially grown on the specific {110} facets of a host MOF (MIL-125). Moreover, the position of ZIF-8 growth on MIL-125 is also selectable by using MIL-125 hosts with {110} facets exposed on either the corner or side surface. Consequently, two MIL-125@ZIF-8 heterostructures with elaborately designed different architectures are synthesized. Benefiting from the high adsorption capacity of ZIF-8 and the photocatalytic activity of MIL-125, the MIL-125@ZIF-8 heterostructures demonstrate synergistically enhanced photocatalytic performance compared to single MOF subunits. Moreover, the corner growth leads to higher activity than the side growth of the MIL-125@ZIF-8 heterostructures. Our contribution paves the way for the rational design of composite MOFs with tunable compositions and nanostructures using the crystal engineering approach. A site-specific epitaxial-growth strategy is developed to synthesize two types of MOF-on-MOF heterostructures with elaborately designed architectures, which are comprised of two MOFs with totally different compositions.
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