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Reversible Modulation of Surface Plasmons in Gold Nanoparticles Enabled by Surface Redox Chemistry
Authors:Dr. Zheng Li  Dr. Jonathan J. Foley IV  Dr. Sheng Peng  Dr. Cheng‐Jun Sun  Dr. Yang Ren  Dr. Gary P. Wiederrecht  Dr. Stephen K. Gray  Dr. Yugang Sun
Affiliation:1. Center for Nanoscale Materials, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439 (USA);2. X‐ray Science Division, Advanced Photon Source, Argonne National Laboratory (USA)
Abstract:Switchable surface redox chemistry is demonstrated in gold@iron/iron oxide core–shell nanoparticles with ambient oxidation and plasmon‐mediated reduction to modulate the oxidation state of shell layers. The iron shell can be oxidized to iron oxide through ambient oxidation, leading to an enhancement and red‐shift of the gold surface plasmon resonance (SPR). This enhanced gold SPR can drive reduction of the iron oxide shell under broadband illumination to reversibly blue‐shift and significantly dampen gold SPR absorption. The observed phenomena provide a unique mechanism for controlling the plasmonic properties and surface chemistry of small metal nanoparticles.
Keywords:core–  shell nanoparticles  gold nanocrystals  iron  surface plasmon resonance  surface redox chemistry
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