Single-Particle Spectroscopy Reveals Heterogeneity in Electrochemical Tuning of the Localized Surface Plasmon

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dc.citation.journalTitleThe Journal of Physical Chemistry Cen_US
dc.contributor.authorByers, Chad P.en_US
dc.contributor.authorHoener, Benjamin S.en_US
dc.contributor.authorChang, Wei-Shunen_US
dc.contributor.authorYorulmaz, Mustafaen_US
dc.contributor.authorLink, Stephanen_US
dc.contributor.authorLandes, Christy F.en_US
dc.contributor.orgRice Quantum Instituteen_US
dc.contributor.orgLaboratory for Nanophotonicsen_US
dc.date.accessioned2014-07-14T20:05:52Zen_US
dc.date.available2014-07-14T20:05:52Zen_US
dc.date.issued2014en_US
dc.description.abstractA hyperspectral imaging method was developed that allowed the identification of heterogeneous plasmon response from 50 nm diameter gold colloidal particles on a conducting substrate in a transparent three-electrode spectroelectrochemical cell under non-Faradaic conditions. At cathodic potentials, we identified three distinct behaviors from different nanoparticles within the same sample: irreversible chemical reactions, reversible chemical reactions, and reversible charge density tuning. The irreversible reactions in particular would be difficult to discern in alternate methodologies. Additional heterogeneity was observed when single nanoparticles demonstrating reversible charge density tuning in the cathodic regime were measured dynamically in anodic potential ranges. Some nanoparticles that showed charge density tuning in the cathodic range also showed signs of an additional chemical tuning mechanism in the anodic range. The expected changes in nanoparticle free-electron density were modeled using a charge density-modified Drude dielectric function and Mie theory, a commonly used model in colloidal spectroelectrochemistry. Inconsistencies between experimental results and predictions of this common physical model were identified and highlighted. The broad range of responses on even a simple sample highlights the rich experimental and theoretical playgrounds that hyperspectral single-particle electrochemistry opens.en_US
dc.identifier.citationByers, Chad P., Hoener, Benjamin S., Chang, Wei-Shun, et al.. "Single-Particle Spectroscopy Reveals Heterogeneity in Electrochemical Tuning of the Localized Surface Plasmon." <i>The Journal of Physical Chemistry C,</i> (2014) American Chemical Society: http://dx.doi.org/10.1021/jp504454y.en_US
dc.identifier.doihttp://dx.doi.org/10.1021/jp504454yen_US
dc.identifier.urihttps://hdl.handle.net/1911/76176en_US
dc.language.isoengen_US
dc.publisherAmerican Chemical Societyen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.titleSingle-Particle Spectroscopy Reveals Heterogeneity in Electrochemical Tuning of the Localized Surface Plasmonen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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