Noble-metal nanoparticles (NPs) (such as Au, Ag, Pd, and Pt) have been the subject of intense research because their unique physiochemical properties are different from those of their bulk counterparts [1] and various applications are anticipated in sensing, [2] imaging, [3] cancer therapy, [4] optical data storage, [5] and catalysis.[6] However, it is well known that free noble-metal NPs have high surface energies and tend to aggregate and fuse; as a result the intriguing properties observed for the NPs disappear and difficulties arise for longterm storage, processing, and applications. Therefore, great efforts have been devoted to develop novel strategies to stabilize NPs, [7] and the most common approach is to coat noble-metal NPs with either organic or inorganic shells. These shells not only endow NPs with high stability but also offer them additional functionalities. As an example, in addition to good stability and biocompatibility, the mesoporous silica shells that are currently broadly used have high surface area and tunable pore size and volume, which can accommodate analytes and drug molecules. [7, 8] Unfortunately, the amorphous structure of silica and its own characteristics determine that it may be used only as a carrier, stabilizer, and ligand linker. In order to break through the limitations and develop a wide range of applications, it is necessary to search for new types of shell materials that not only have properties similar to those of porous silica but also impart new functionalities.In addition to high specific surface area and tunable pore size and volume, metal-organic frameworks (MOFs) have many exciting characteristics including structural adaptivity and flexibility, ordered crystalline pores, and multiple coordination sites, and offer various functions such as chemical separation, [9] gas storage,