Rhodium nanoparticles for ultraviolet plasmonics
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AuthorWatson, Anne M.; Zhang, Xiao; Alcaraz de la Osa, Rodrigo; Sanz Casado, Juan Marcos; González Fernández, Francisco; Moreno Gracia, Fernando; Finkelstein, Gleb; Liu, Jie; Everitt, Henry O.
The nonoxidizing catalytic noble metal rhodium is introduced for ultraviolet plasmonics. Planar tripods of 8 nm Rh nanoparticles, synthesized by a modified polyol reduction method, have a calculated local surface plasmon resonance near 330 nm. By attaching p-aminothiophenol, local field-enhanced Raman spectra and accelerated photodamage were observed under near-resonant ultraviolet illumination, while charge transfer simultaneously increased fluorescence for up to 13 min. The combined local field enhancement and charge transfer demonstrate essential steps toward plasmonically enhanced ultraviolet photocatalysis.