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Self-organized nanorod arrays for large-area surface-enhanced infrared absorption

Capabilities of highly sensitive surface-enhanced infrared absorption (SEIRA) spectroscopy are demonstrated by exploiting large-area templates (cm2) based on self-organized (SO) nanorod antennas. We engineered highly dense arrays of gold nanorod antennas featuring polarization-sensitive localized pl...

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Bibliographic Details
Main Authors: Giordano, Maria Caterina (Author) , Tzschoppe, Michael (Author) , Barelli, M. (Author) , Vogt, Jochen (Author) , Huck, Christian (Author) , Canepa, F. (Author) , Pucci, Annemarie (Author) , Buatier de Mongeot, F. (Author)
Format: Article (Journal)
Language:English
Published: 4 March 2020
In: ACS applied materials & interfaces
Year: 2020, Volume: 12, Issue: 9, Pages: 11155-11162
ISSN:1944-8252
DOI:10.1021/acsami.9b19719
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/acsami.9b19719
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Author Notes:M.C. Giordano, M. Tzschoppe, M. Barelli, J. Vogt, C. Huck, F. Canepa, A. Pucci, and F. Buatier de Mongeot
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Summary:Capabilities of highly sensitive surface-enhanced infrared absorption (SEIRA) spectroscopy are demonstrated by exploiting large-area templates (cm2) based on self-organized (SO) nanorod antennas. We engineered highly dense arrays of gold nanorod antennas featuring polarization-sensitive localized plasmon resonances, tunable over a broadband near- and mid-infrared (IR) spectrum, in overlap with the so-called “functional group” window. We demonstrate polarization-sensitive SEIRA activity, homogeneous over macroscopic areas and stable in time, by exploiting prototype self-assembled monolayers of IR-active octadecanthiol (ODT) molecules. The strong coupling between the plasmonic excitation and molecular stretching modes gives rise to characteristic Fano resonances in SEIRA. The SO engineering of the active hotspots in the arrays allows us to achieve signal amplitude improved up to 5.7%. This figure is competitive to the response of lithographic nanoantennas and is stable when the optical excitation spot varies from the micro- to macroscale, thus enabling highly sensitive SEIRA spectroscopy with cost-effective nanosensor devices.
Item Description:Gesehen am 09.04.2020
Physical Description:Online Resource
ISSN:1944-8252
DOI:10.1021/acsami.9b19719

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