Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 31, Pages 8948-8951Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201502012
Keywords
core-shell nanoparticles; gold nanocrystals; iron; surface plasmon resonance; surface redox chemistry
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences User Facility [DE-AC02-06CH11357]
- University of Washington
- Advanced Photon Source
- U.S. DOE [DE-AC02-06CH11357]
- US Department of Energy-Basic Energy Sciences
- Canadian Light Source
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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.
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