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Gold/Wüstite Core–shell Nanoparticles: Suppression of Iron Oxidation through the Electron‐Transfer Phenomenon
Author(s) -
Singh Prerna,
Mott Derrick M.,
Maenosono Shinya
Publication year - 2013
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201300471
Subject(s) - maghemite , magnetite , wüstite , x ray photoelectron spectroscopy , electron transfer , materials science , nanoparticle , iron oxide , shell (structure) , paramagnetism , chemical engineering , analytical chemistry (journal) , nanotechnology , chemistry , metallurgy , composite material , physics , chromatography , engineering , quantum mechanics
Plasmonic Au and magnetic Fe are coupled into uniform Au@Fe core–shell nanoparticles (NPs) to confirm that electron transfer occurred from the Au core to the Fe shell. Au NPs synthesized in aqueous medium are used as seeds and coated with an Fe shell. The resulting Au@Fe NPs are characterized by using various analytical techniques. X‐ray photoelectron spectroscopy and superconducting quantum interference device measurements reveal that the Fe shell of the Au@Fe NPs mainly consists of paramagnetic Wüstite with a thin surface oxide layer consisting of maghemite or magnetite. Electron transfer from the Au core to the Fe shell effectively suppresses iron oxidation from Fe 2+ to Fe 3+ near the interface between the Au and the Fe. The charge‐transfer‐induced electronic modification technique enables us to control the degree of iron oxidation and the resulting magnetic properties.