Fig. 1 Reversible redox tuning of Au/Ag nanoparticles.

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Fig. 1 Reversible redox tuning of Au/Ag nanoparticles. Reversible redox tuning of Au/Ag nanoparticles. (A) Nanoparticle shells were reversibly switched between Ag and AgCl using redox electrochemistry. The optical response to redox tuning was measured using single-particle spectroscopy under electrochemical potential control. (B) HAADF-STEM and EDS elemental maps of a single Au/Ag nanoparticle show clear core-shell geometry. (C) Mean response over five cycles of changes in resonance energy (ΔE), full width at half maximum (ΔΓ), and intensity (ΔI) as a function of applied potential under different electrolyte conditions. (Inset) Small-intensity response for control and thin-shell cases. Shaded bounds indicate standard error. au, arbitrary units. Chad P. Byers et al. Sci Adv 2015;1:e1500988 Copyright © 2015, The Authors