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Controlled Plasmonic Coupling in Silver Nanoplate Dimers for Enhanced Plasmonic Sensing.

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Title: Controlled Plasmonic Coupling in Silver Nanoplate Dimers for Enhanced Plasmonic Sensing.
Authors: Catanzaro, Lucrezia1 (AUTHOR), Condorelli, Marcello1,2 (AUTHOR) marcello.condorelli@unict.it, Pulvirenti, Mario1 (AUTHOR), D'urso, Luisa1,2 (AUTHOR), Compagnini, Giuseppe1,2 (AUTHOR)
Source: Nanomaterials (2079-4991). Apr2026, Vol. 16 Issue 8, p486. 15p.
Subjects: Silver nanoparticles, SERS spectroscopy, Optical properties, Nanoparticles, Nanophotonics, Surface plasmon resonance
Abstract: Noble metal nanostructures provide versatile platforms for light manipulation through localized surface plasmon resonances (LSPRs). Among them, triangular silver nanoplates (AgNPTs) exhibit strong field-enhancement and spectral tunability, yet assembling them reproducibly on solids is challenging. We report a two-step functionalization strategy for constructing ordered AgNPT dimers on silica substrates, combining 3-aminopropyltriethoxysilane (APTES) anchoring with 1,4-butanedithiol bridging. AFM reveals face-to-face dimers with well-defined sub-nanometer gaps. Large-area AFM statistics collected over multiple regions (N = 80 nanoplates per condition) confirm reproducible and selective vertical dimerization. Extinction spectroscopy reveals sequential dielectric and coupling effects: thiol adsorption red-shifts the main resonance from 700 to 780 nm because of increased local refractive index and near-field damping, whereas dimerization partially restores it to ≈750 nm, consistent with plasmon hybridization within rigid ∼0.7 nm molecular gaps, where nonclassical moderation may occur but classical hybridization fully explains the observed shifts. Concomitantly, the extinction intensity doubles, following an exponential growth toward saturation during assembly. Surface-enhanced Raman scattering (SERS) measurements using 4-mercaptobenzoic acid (4-MBA) confirm a fourfold increase in the SERS enhancement factor from monolayer to bilayer, consistent with near-field coupling and hotspot formation at interplate junctions. Quantitative plasmon sensitivity analysis yields comparable results between experiments and finite-difference-time-domain simulations, confirming that the observed spectral shifts arise from near-field coupling and dielectric modulation rather than ensemble effects. This reproducible methodology enables precise tuning of NPT orientation, spacing, and optical response, providing a robust platform for enhanced sensing, SERS, and nanophotonic device engineering. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Controlled Plasmonic Coupling in Silver Nanoplate Dimers for Enhanced Plasmonic Sensing.
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  Data: <searchLink fieldCode="AR" term="%22Catanzaro%2C+Lucrezia%22">Catanzaro, Lucrezia</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Condorelli%2C+Marcello%22">Condorelli, Marcello</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> marcello.condorelli@unict.it</i><br /><searchLink fieldCode="AR" term="%22Pulvirenti%2C+Mario%22">Pulvirenti, Mario</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22D'urso%2C+Luisa%22">D'urso, Luisa</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Compagnini%2C+Giuseppe%22">Compagnini, Giuseppe</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Apr2026, Vol. 16 Issue 8, p486. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Silver+nanoparticles%22">Silver nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22SERS+spectroscopy%22">SERS spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+properties%22">Optical properties</searchLink><br /><searchLink fieldCode="DE" term="%22Nanoparticles%22">Nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Nanophotonics%22">Nanophotonics</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+plasmon+resonance%22">Surface plasmon resonance</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Noble metal nanostructures provide versatile platforms for light manipulation through localized surface plasmon resonances (LSPRs). Among them, triangular silver nanoplates (AgNPTs) exhibit strong field-enhancement and spectral tunability, yet assembling them reproducibly on solids is challenging. We report a two-step functionalization strategy for constructing ordered AgNPT dimers on silica substrates, combining 3-aminopropyltriethoxysilane (APTES) anchoring with 1,4-butanedithiol bridging. AFM reveals face-to-face dimers with well-defined sub-nanometer gaps. Large-area AFM statistics collected over multiple regions (N = 80 nanoplates per condition) confirm reproducible and selective vertical dimerization. Extinction spectroscopy reveals sequential dielectric and coupling effects: thiol adsorption red-shifts the main resonance from 700 to 780 nm because of increased local refractive index and near-field damping, whereas dimerization partially restores it to ≈750 nm, consistent with plasmon hybridization within rigid ∼0.7 nm molecular gaps, where nonclassical moderation may occur but classical hybridization fully explains the observed shifts. Concomitantly, the extinction intensity doubles, following an exponential growth toward saturation during assembly. Surface-enhanced Raman scattering (SERS) measurements using 4-mercaptobenzoic acid (4-MBA) confirm a fourfold increase in the SERS enhancement factor from monolayer to bilayer, consistent with near-field coupling and hotspot formation at interplate junctions. Quantitative plasmon sensitivity analysis yields comparable results between experiments and finite-difference-time-domain simulations, confirming that the observed spectral shifts arise from near-field coupling and dielectric modulation rather than ensemble effects. This reproducible methodology enables precise tuning of NPT orientation, spacing, and optical response, providing a robust platform for enhanced sensing, SERS, and nanophotonic device engineering. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/nano16080486
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        Text: English
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        PageCount: 15
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      – SubjectFull: SERS spectroscopy
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      – SubjectFull: Optical properties
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      – SubjectFull: Nanoparticles
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      – SubjectFull: Nanophotonics
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      – SubjectFull: Surface plasmon resonance
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      – TitleFull: Controlled Plasmonic Coupling in Silver Nanoplate Dimers for Enhanced Plasmonic Sensing.
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            NameFull: Catanzaro, Lucrezia
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              Text: Apr2026
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              Y: 2026
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