Spatially-Localized Functionalization on Nanostructured Surfaces for Enhanced Plasmonic Sensing Efficacy

This work demonstrates the enhancement in plasmonic sensing efficacy resulting from spatially-localized functionalization on nanostructured surfaces, whereby probe molecules are concentrated in areas of high field concentration. Comparison between SERS measurements on nanostructured surfaces (arrays...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2022-10, Vol.12 (20), p.3586
Main Authors: Bryche, Jean-François, Vega, Marlo, Tempez, Agnès, Brulé, Thibault, Carlier, Thomas, Moreau, Julien, Chaigneau, Marc, Charette, Paul G., Canva, Michael
Format: Article
Language:English
Subjects:
Arrays
Diameters
Effectiveness
Electric fields
Engineering Sciences
Geometry
Glass substrates
Gold
Micro and nanotechnologies
Microelectronics
Nanostructure
nanostructures
Plasmonics
Raman spectroscopy
SERS
Simulation
Spatial discrimination
Spatial resolution
Spectrum analysis
surface functionalization
TERS
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Summary:This work demonstrates the enhancement in plasmonic sensing efficacy resulting from spatially-localized functionalization on nanostructured surfaces, whereby probe molecules are concentrated in areas of high field concentration. Comparison between SERS measurements on nanostructured surfaces (arrays of nanodisks 110 and 220 nm in diameter) with homogeneous and spatially-localized functionalization with thiophenol demonstrates that the Raman signal originates mainly from areas with high field concentration. TERS measurements with 10 nm spatial resolution confirm the field distribution profiles predicted by the numerical modeling. Though this enhancement in plasmonic sensing efficacy is demonstrated with SERS, results apply equally well to any type of optical/plasmonic sensing on functionalized surfaces with nanostructuring.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12203586