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Facile synthesis of metal nanoparticles/metal-organic frameworks (MOFs) nanocomposite based on preferential self-assembly of frameworks on nanoparticle surface was accomplished by versatile layer-by-layer (LBL) approach. We report the successful growth of MIL-100(Fe) films on Ag nanoparticle surface. This approach involves the synthesis of polyvinylpyrrolidone (PVP)-functionalized Ag nanoparticles and stepwise growth of frameworks consisting of Fe ions and benzene-1,3,5,-tricarboxylate (btc) on nanoparticles. Ag nanoparticles can be act as scaffolds for construction of MOF frameworks. The resulting Ag nanoparticle/MIL-100(Fe) core-shell nanostructures were characterized by transmission electron microscopy (TEM). Additionally, HKUST-1, consisting of Cu ions and btc, was synthesized on Ag nanoparticle surface by the same LBL approach. The present approach can be utilized to fabricate various types of metal nanoparticles/MOF nanocomposites that exhibit the optoelectronic properties of the nanoparticles and the molecular sieving effect of the MOFs.

Controlled Synthesis of Metal-Organic Framework Films on Metal Nanoparticles by the Versatile Layer-by-Layer Assembly Approach