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Reversible Modulation of Surface Plasmons in Gold Nanoparticles Enabled by Surface Redox Chemistry
Author(s) -
Li Zheng,
Foley Jonathan J.,
Peng Sheng,
Sun ChengJun,
Ren Yang,
Wiederrecht Gary P.,
Gray Stephen K.,
Sun Yugang
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201502012
Subject(s) - surface plasmon resonance , redox , nanoparticle , plasmon , iron oxide , colloidal gold , oxide , surface plasmon , metal , nanotechnology , prussian blue , chemistry , materials science , absorption (acoustics) , photochemistry , inorganic chemistry , electrochemistry , optoelectronics , electrode , metallurgy , composite material
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.