Resonant Coupling between Molecular Vibrations and Localized Surface Plasmon Resonance of Faceted Metal Oxide Nanocrystals

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dc.citation.journalTitleNano Lettersen_US
dc.contributor.authorAgrawal, Ankiten_US
dc.contributor.authorSingh, Ajayen_US
dc.contributor.authorYazdi, Sadeghen_US
dc.contributor.authorSingh, Amitaen_US
dc.contributor.authorOng, Gary K.en_US
dc.contributor.authorBustillo, Karenen_US
dc.contributor.authorJohns, Robert W.en_US
dc.contributor.authorRinge, Emilieen_US
dc.contributor.authorMilliron, Delia J.en_US
dc.date.accessioned2017-04-04T17:30:17Z
dc.date.available2017-04-04T17:30:17Z
dc.date.issued2017en_US
dc.description.abstractDoped metal oxides are plasmonic materials that boast both synthetic and postsynthetic spectral tunability. They have already enabled promising smart window and optoelectronic technologies and have been proposed for use in surface enhanced infrared absorption spectroscopy (SEIRA) and sensing applications. Herein, we report the first step toward realization of the former utilizing cubic F and Sn codoped In2O3 nanocrystals (NCs) to couple to the C–H vibration of surface-bound oleate ligands. Electron energy loss spectroscopy is used to map the strong near-field enhancement around these NCs that enables localized surface plasmon resonance (LSPR) coupling between adjacent nanocrystals and LSPR-molecular vibration coupling. Fourier transform infrared spectroscopy measurements and finite element simulations are applied to observe and explain the nature of the coupling phenomena, specifically addressing coupling in mesoscale assembled films. The Fano line shape signatures of LSPR-coupled molecular vibrations are rationalized with two-port temporal coupled mode theory. With this combined theoretical and experimental approach, we describe the influence of coupling strength and relative detuning between the molecular vibration and LSPR on the enhancement factor and further explain the basis of the observed Fano line shape by deconvoluting the combined response of the LSPR and molecular vibration in transmission, absorption and reflection. This study therefore illustrates various factors involved in determining the LSPR–LSPR and LSPR–molecular vibration coupling for metal oxide materials and provides a fundamental basis for the design of sensing or SEIRA substrates.en_US
dc.identifier.citationAgrawal, Ankit, Singh, Ajay, Yazdi, Sadegh, et al.. "Resonant Coupling between Molecular Vibrations and Localized Surface Plasmon Resonance of Faceted Metal Oxide Nanocrystals." <i>Nano Letters,</i> (2017) American Chemical Society: http://dx.doi.org/10.1021/acs.nanolett.7b00404.
dc.identifier.doihttp://dx.doi.org/10.1021/acs.nanolett.7b00404en_US
dc.identifier.urihttps://hdl.handle.net/1911/94054
dc.language.isoengen_US
dc.publisherAmerican Chemical Society
dc.rightsThis is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.en_US
dc.rights.urihttp://pubs.acs.org.ezproxy.rice.edu/page/policy/authorchoice_termsofuse.htmlen_US
dc.subject.keywordEELSen_US
dc.subject.keywordFano resonanceen_US
dc.subject.keywordInfrared plasmonen_US
dc.subject.keywordmetal oxideen_US
dc.subject.keywordSEIRAen_US
dc.titleResonant Coupling between Molecular Vibrations and Localized Surface Plasmon Resonance of Faceted Metal Oxide Nanocrystalsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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