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dc.contributor.authorAgrawal, Ankit
Singh, Ajay
Yazdi, Sadegh
Singh, Amita
Ong, Gary K.
Bustillo, Karen
Johns, Robert W.
Ringe, Emilie
Milliron, Delia J.
dc.date.accessioned 2017-04-04T17:30:17Z
dc.date.available 2017-04-04T17:30:17Z
dc.date.issued 2017
dc.identifier.citation Agrawal, Ankit, Singh, Ajay, Yazdi, Sadegh, et al.. "Resonant Coupling between Molecular Vibrations and Localized Surface Plasmon Resonance of Faceted Metal Oxide Nanocrystals." Nano Letters, (2017) American Chemical Society: http://dx.doi.org/10.1021/acs.nanolett.7b00404.
dc.identifier.urihttps://hdl.handle.net/1911/94054
dc.description.abstract Doped 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.
dc.language.iso eng
dc.publisher American Chemical Society
dc.rights This 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.
dc.rights.urihttp://pubs.acs.org.ezproxy.rice.edu/page/policy/authorchoice_termsofuse.html
dc.title Resonant Coupling between Molecular Vibrations and Localized Surface Plasmon Resonance of Faceted Metal Oxide Nanocrystals
dc.type Journal article
dc.citation.journalTitle Nano Letters
dc.subject.keywordEELS
Fano resonance
Infrared plasmon
metal oxide
SEIRA
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1021/acs.nanolett.7b00404
dc.identifier.pmid 28337921
dc.type.publication publisher version


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