Bimetallic nanoparticles, composed of two metal elements in a single particle, exhibit interesting optical, chemical, and biological properties. Among the various structures of bimetallic nanoparticles, the core–shell structure is scientifically interesting, especially from the viewpoint of catalysis. Core–shell bimetallic nanoparticles have higher catalytic activity than monometallic ones. The compositions of the core and shell of bimetallic nanoparticles produced in liquid phase depends on the ionization tendency of the atoms. In this study, we have investigated the vapor-phase production of core–shell bimetallic nanoparticles, which is independent of the ionization tendency of nanoparticles.<br/> Two furnaces were connected and then Ag and Au grains were placed in them. The Ag and Au grains loaded in a quartz tube were vaporized at around 1100 °C and 1500 °C in a furnace with N<sub>2</sub> gas flow under atmospheric conditions. The obtained nanoparticles were analyzed using transmission electron microscopy (TEM), energy-dispersive X-ray (EDX) spectroscopy, and UV-vis spectrophotometry. The TEM image shows that the diameter of the captured nanoparticles was under 10 nm. The EDX spectrum shows that the nanoparticles obtained had a homogeneous alloy structure. The UV-vis absorption spectrum shows that the wavelength of the plasmon resonance shifted compared with that of the Ag and Au nanoparticles. These results suggest that the produced nanoparticles were composed of Ag and Au. The details of the structure of the produced nanoparticles (whether or not composed of core–shell) will be discussed at the poster presentation.

Production of bimetallic nanoparticles in vapor phase

256th National Meeting (2018)

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