Imparting functionality to a metal-organic framework material by controlled nanoparticle encapsulation
Imparting functionality to a metal-organic framework material by controlled nanoparticle encapsulation
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DOI：
10.1038/nchem.1272
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发表时间：
2012-04-01
期刊：
影响因子：
21.8
通讯作者：
Huo, Fengwei
中科院分区：
文献类型：
--
作者：
Lu, Guang;Li, Shaozhou;Huo, Fengwei
具有永久孔隙率的微孔金属有机框架（MOF）在多种用途上显示出巨大的前景。通过将各种功能物质（例如纳米颗粒）封装在框架内，可以进一步开发和扩展 MOF 的潜在应用。然而，尽管纳米颗粒/MOF 复合材料的报道越来越多，同时控制 MOF 基质中掺入的纳米颗粒的尺寸、组成、分散性质、空间分布和限制仍然是一个重大挑战。在这里，我们报告了一种受控封装策略，该策略使各种尺寸、形状和成分的表面活性剂封端的纳米结构物体能够被沸石咪唑酯框架（ZIF-8）包裹。掺入的纳米颗粒充分分散并完全限制在 ZIF-8 晶体内。该策略还允许在每个 ZIF-8 微晶中受控地掺入多个纳米颗粒。所制备的纳米颗粒/ZIF-8 复合材料表现出源自纳米颗粒的活性（催化、磁性和光学）特性以及源自框架材料的分子筛分和取向效应。
Microporous metal-organic frameworks (MOFs) that display permanent porosity show great promise for a myriad of purposes. The potential applications of MOFs can be developed further and extended by encapsulating various functional species (for example, nanoparticles) within the frameworks. However, despite increasing numbers of reports of nanoparticle/MOF composites, simultaneously to control the size, composition, dispersed nature, spatial distribution and confinement of the incorporated nanoparticles within MOF matrices remains a significant challenge. Here, we report a controlled encapsulation strategy that enables surfactant-capped nanostructured objects of various sizes, shapes and compositions to be enshrouded by a zeolitic imidazolate framework (ZIF-8). The incorporated nanoparticles are well dispersed and fully confined within the ZIF-8 crystals. This strategy also allows the controlled incorporation of multiple nanoparticles within each ZIF-8 crystallite. The as-prepared nanoparticle/ZIF-8 composites exhibit active (catalytic, magnetic and optical) properties that derive from the nanoparticles as well as molecular sieving and orientation effects that originate from the framework material.