Nanoparticles (NPs) of coinage metals such as Au, Ag, and Cu, have been predominantly researched for their intrinsic exhibition of localized surface plasmon resonance (LSPR) in the visible region. Alloy NPs containing these coinage metals have been used to control the LSPR wavelength, but most of them have face-centered cubic (fcc)-based crystal structures. Recently, we have achieved LSPR in the visible region with intermetallic compound NPs that do not contain coinage metals. The colloidal PtIn2 NPs with a C1 (CaF2-type) crystal structure can be synthesized by the liquid phase method. These NPs show LSPR at wavelengths akin to fcc-Au NPs. These findings dramatically expand the plasmonic nanomaterials library and will contribute to our understanding of the LSPR properties of intermetallic NPs.
To reduce the effects of global warming, visible and near-infrared light must be used more efficiently. Deep ultraviolet light (8 eV) is required for the direct dissociation of CO2 by light; however, the introduction of a metal complex has made it possible to realize CO2 reduction with visible light. We demonstrate that the optical near field (ONF) can increase the CO2 reduction rate. For this, we used gold clusters, because they can be a suitable source for ONFs, as their size and density can be controlled by the number of gold atoms. By attaching a metal complex near gold clusters with diameters of 1.0 to 1.3 nm, we confirm that the reduction rate of CO2 to CO increased by 1.5 to 2.1 times. The gold clusters were sufficiently small; therefore, there was no plasmonic resonant peak or heat generation. Because the near-field effect is based on a photochemical reaction, it can be applied to other metal complexes used in CO2 reduction, and it has other applications such as water splitting and water purification.
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