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Cited by 164Gold and Silver Nanoparticles Synthesis and ApplicationsPlasmonic and Surface Plasmon ResearchLaser-Ablation Synthesis of Nanoparticles

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Versatile Solution Phase Triangular Silver Nanoplates for Highly Sensitive Plasmon Resonance Sensing

Charles, Denise E., Aherne, Damian, Gara, Matthew, Ledwith, Deirdre M., Gun’ko, Yurii K., Kelly, John M., Blau, Werner J., Brennan-Fournet, Margaret E.·2010·ACS Nano
DOI 10.1021/nn9016235
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Abstract

Solution phase triangular silver nanoplates (TSNP) with versatile tunability throughout the visible-NIR wavelengths are presented as highly sensitive localized surface plasmon refractive index sensors. A range of 20 TSNP solutions with edge lengths ranging from 11 to 200 nm and aspect ratios from 2 to 13 have been studied comprehensively using AFM, TEM, and UV-vis-NIR spectroscopy. Studies of the localized surface plasmon resonance (LSPR) peak's sensitivity to refractive index changes are performed using a simple sucrose concentration method whereby the surrounding refractive index can solely be changed without variation in any other parameter. The dependence of the TSNP localized surface plasmon resonance (LSPR) peak wavelength lambda(max) and its bulk refractive index sensitivity on the nanoplate's structure is determined. LSPR sensitivities are observed to increase linearly with lambda(max) up to 800 nm, with the values lying within the upper limit theoretically predicted for optimal sensitivity, notwithstanding any diminution due to ensemble averaging. A nonlinear increase in sensitivity is apparent at wavelengths within the NIR region with values reaching 1096 nm.RIU(-1) at lambda(max) 1093 nm. Theoretical studies performed using a simple aspect ratio dependent approximation method and discrete dipole approximation methods confirm the dependence of the LSPR bulk refractive index sensitivity upon the TSNP aspect ratio measured experimentally. These studies highlight the importance of this key parameter in acquiring such high sensitivities and promote these TSNP sols for sensing applications at appropriate wavelengths for biological samples.

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  • The dependence of plasmon resonance on the refractive index of the medium can be exploited for optical sensing applications, even at single molecule level, as long as molecules cause a variation of the refractive index.

    “The above mentioned dependence of the plasmon resonance on the refractive index of the medium can be exploited for optical sensing applications [163], even at a single molecule level [164,165], as it allows the detection of molecules dissolved in the colloidal phase or adsorbed on the surface, as long as they cause a variation of the refractive index of the medium [166,167].”

    From Nanoparticles Engineering by Pulsed Laser Ablation in Liquids: Concepts and Applications (2020) · cites this paper as [163]

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Metadata

Authors
Charles, D. E., Aherne, D., Gara, M., Ledwith, D. M., Gun’ko, Y. K., Kelly, J. M., Blau, W. J., & Brennan-Fournet, M. E.
Affiliations
  • Trinity College Dublin (IE)
  • School of Physics
Corresponding author
Charles, Denise E.
ORCID
Venue
ACS Nano
Publisher
American Chemical Society (ACS)
Published
2009-12-23
Volume
4
Issue
1
Pages
55-64
ISSN
  • 1936-0851 (ISSN-L)
  • 1936-086X
DOI
10.1021/nn9016235
OpenAlex
W1974000173
Cited by
164
References
0
Citations by year
2026: 3 · 2025: 1 · 2024: 6 · 2023: 6 · 2022: 8 · 2021: 10 · 2020: 10 · 2019: 9 · 2018: 12 · 2017: 16 · 2016: 13 · 2015: 20 · 2014: 9 · 2013: 15 · 2012: 15
FWCI
3.65
Type
journal article
Language
en
Open access
closed
Locations
  • ACS Nano (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Gold and Silver Nanoparticles Synthesis and Applications
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Plasmonic and Surface Plasmon Research
  • Physical Sciences › Materials Science › Materials Chemistry › Laser-Ablation Synthesis of Nanoparticles
Keywords
localized surface plasmon resonance, refractive index sensing, plasmonic biosensors, aspect ratio, edge length, sucrose concentration, discrete dipole approximation, ensemble averaging
MeSH terms
Silver, Solutions, Spectrum Analysis, Microscopy, Atomic Force, Surface Plasmon Resonance, Metal Nanoparticles

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