Syntheses and functions of Trimetallic Nanoparticles with a Triple Core/Shell Structure

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This research aims to create a new type of trimetallic nanoparticles and to establish their fundamentals in order to apply them to new functional materials. In practice, a new type of trimetallic nanoparticles having a triple core/shell structure will be synthesized by using the self-organization of metal nanoparticles, in order to develop new catalysts. In addition, the effect of the third element on the synthesis of new bimetallic alloy nanomagnets will be examined in order to develop a new nanomagnet applicable to super-high-density magnetic memory. The following is the results.1. Physical mixture of two kinds of metal nanoparticles such as Ag and Rh nanoparticles was found to produce bimetallic nanoparticles with a core/shell structure. The reaction mechanism has been proposed based on UV-Vis, TEM and EXAFS measurements.2. Trimetallic nanoparticles having Pd-core/Ag-interlayer/Rh-shell triple core/shell structure have been synthesized by using the physical mixture of Pd-core/Ag-shell bimetallic nanoparticles with Rh nanoparticles (self-organization). These trimetallic nanoparticles have much higher catalytic activity for hydrogenation of olefins than the corresponding monometallic, bimetallic and trimetallic nanoparticles with different structures.3. Addition of the third elements such as Au and Cu to the reaction system to produce SmCo5 nanoparticles can help to create stable SmCo5 nanomagnets. This will be the first report to produce the SuCo5 nanomagnet having enough high coercivity at room temperature.