Large spectral shift of plasmon resonances in Au–Cu alloy nanoparticles through anisotropy and interaction

Recent Developments in Plasmonic Alloy Nanoparticles: Synthesis, Modelling, Properties and Applications

“…Majhi et al. studied Au−Cu spherical NPs in a silica medium, showing the presence of a single LSP shifted with the composition between ∼535 nm (Au) and 590 nm (Cu) [144,150] . The FWHM of the plasmon band becomes broader due to the contribution of IB transitions in Cu.…”

“…Majhi et al studied AuÀ Cu spherical NPs in a silica medium, showing the presence of a single LSP shifted with the composition between ~535 nm (Au) and 590 nm (Cu). [144,150] The FWHM of the plasmon band becomes broader due to the contribution of IB transitions in Cu. The same approach was exploited for the AgÀ Cu system, which however is not miscible and very difficult to obtain as a homogeneous sample, despite still showing intermediate plasmon absorption between the pure Ag and Cu equivalent nanostructures.…”

Laser Ablation Nanoarchitectonics of Au–Cu Alloys Deposited on TiO2 Photocatalyst Films for Switchable Hydrogen Evolution from Formic Acid Dehydrogenation

“…Broad absorption bands at approximately 530 nm for Au/TiO 2 and 600 nm for Cu/TiO 2 were attributed to the localized surface plasmon resonance of Au and Cu NPs, respectively. The plasmon peaks of Au–Cu/TiO 2 exhibited a red shift with an increase in Cu content in accordance with the alloy effect of Au and Cu . The results indicate that the laser ablation method for preparing Au–Cu NPs provides easy and precise control of alloy compositions by using the corresponding alloy targets.…”

“…The plasmon peaks of Au–Cu/TiO 2 exhibited a red shift with an increase in Cu content in accordance with the alloy effect of Au and Cu. 42 The results indicate that the laser ablation method for preparing Au–Cu NPs provides easy and precise control of alloy compositions by using the corresponding alloy targets. Since the deposited Au–Cu NPs were uniform in morphology and size, we accurately evaluated and compared the catalytic activity of each photocatalyst film to investigate the catalytic mechanism.…”

Biosynthesis of Artemisia abyssinica Leaf Extract-Mediated Bimetallic ZnO–CuO Nanoparticles: Antioxidant, Anticancer, and Molecular Docking Studies

“…Recent studies reported that anisotropic particles show two or more SPR bands, while spherical nanoparticles show only a single SPR band, depending on the shape of the NPs . Hence, the single SPR peak in the UV–visible spectrum of ZC NPs illustrates the formation of iso-morphological particles . Phytochemical constituents (phenolic compounds) from the LEAA are responsible for the bioreduction of precursor salts to ZC NPs. , The capping agents regulate the stability and functionalization of the ZC NPs in the medium in which they are suspended .…”