材料科学
咪唑酯
纳米颗粒
金属有机骨架
纳米技术
多孔性
分子
纳米结构
沸石咪唑盐骨架
化学工程
吸附
化学
有机化学
工程类
复合材料
作者
Guangchao Zheng,Sarah De Marchi,Vanesa López-Puente,Kadir Sentosun,Lakshminarayana Polavarapu,Ignacio Pérez‐Juste,Eric H. Hill,Sara Bals,Luis M. Liz‐Marzán,Isabel Pastoriza‐Santos,Jorge Pérez‐Juste
出处
期刊:Small
[Wiley]
日期:2016-06-06
卷期号:12 (29): 3935-3943
被引量:143
标识
DOI:10.1002/smll.201600947
摘要
Hybrid nanostructures composed of metal nanoparticles and metal-organic frameworks (MOFs) have recently received increasing attention toward various applications due to the combination of optical and catalytic properties of nanometals with the large internal surface area, tunable crystal porosity and unique chemical properties of MOFs. Encapsulation of metal nanoparticles of well-defined shapes into porous MOFs in a core-shell type configuration can thus lead to enhanced stability and selectivity in applications such as sensing or catalysis. In this study, the encapsulation of single noble metal nanoparticles with arbitrary shapes within zeolitic imidazolate-based metal organic frameworks (ZIF-8) is demonstrated. The synthetic strategy is based on the enhanced interaction between ZIF-8 nanocrystals and metal nanoparticle surfaces covered by quaternary ammonium surfactants. High resolution electron microscopy and tomography confirm a complete core-shell morphology. Such a well-defined morphology allowed us to study the transport of guest molecules through the ZIF-8 porous shell by means of surface-enhanced Raman scattering by the metal cores. The results demonstrate that even molecules larger than the ZIF-8 aperture and pore size may be able to diffuse through the framework and reach the metal core.
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