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Dispersible Plasmonic Doped Metal Oxide Nanocrystal Sensors that Optically Track Redox Reactions in Aqueous Media with Single‐Electron Sensitivity
Author(s) -
Mendelsberg Rueben J.,
McBride Patrick M.,
Duong Jennifer T.,
Bailey Mark J.,
Llordes Anna,
Milliron Delia J.,
Helms Brett A.
Publication year - 2015
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201500208
Subject(s) - plasmon , materials science , redox , nanocrystal , electron transfer , indium tin oxide , doping , oxide , free electron model , aqueous solution , electron , indium , photochemistry , tin oxide , optoelectronics , nanotechnology , chemical physics , thin film , chemistry , physics , quantum mechanics , metallurgy
Electron transfer in complex aqueous systems can be observed remotely with single‐electron sensitivity using locally dispersed nanostructures conferred with electronic charge concentration‐dependent plasmonic properties. When introduced to a system out of redox equilibrium, tin‐doped indium oxide nanocrystals undergo rapid multielectron transfer until redox equilibrium is reached; this modulates their free carrier concentration and plasmonic optical properties in the spectrally isolated near‐infrared. This capability is harnessed here to noninvasively track, model, and quantify electron transfer events reversibly for organic, inorganic, biogenic, and even living cells.