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  5. Single-Molecule Nonresonant Wide-Field Surface-Enhanced Raman Scattering from Ferroelectrically Defined Au Nanoparticle Microarrays
 
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Single-Molecule Nonresonant Wide-Field Surface-Enhanced Raman Scattering from Ferroelectrically Defined Au Nanoparticle Microarrays

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Author(s)
Al-Shammari, Rusul M. 
Al-Attar, Nebras 
Manzo, Michele 
Gallo, Katia 
Rodriguez, Brian J. 
Rice, James H. 
Uri
http://hdl.handle.net/10197/12002
Date Issued
15 March 2018
Date Available
02T17:10:51Z March 2021
Abstract
Single-molecule detection by surface-enhanced Raman scattering (SERS) is a powerful spectroscopic technique that is of interest for the sensor development field. An important aspect of optimizing the materials used in SERS-based sensors is the ability to have a high density of "hot spots" that enhance the SERS sensitivity to the single-molecule level. Photodeposition of gold (Au) nanoparticles through electric-field-directed self-assembly on a periodically proton-exchanged lithium niobate (PPELN) substrate provides conditions to form well-ordered microscale features consisting of closely packed Au nanoparticles. The resulting Au nanoparticle microstructure arrays (microarrays) are plasmon-active and support nonresonant single-molecule SERS at ultralow concentrations (<10-9-10-13 M) with excitation power densities <1 × 10-3 W cm-2 using wide-field imaging. The microarrays offer excellent SERS reproducibility, with an intensity variation of <7.5% across the substrate. As most biomarkers and molecules do not support resonance enhancement, this work demonstrates that PPELN is a suitable template for high-sensitivity, nonresonant sensing applications.
Sponsorship
Science Foundation Ireland
Other Sponsorship
UCD School of Physics
Swedish Scientific Research Council
ADOPT Linnaeus Centre for Advanced Optics and Photonics in Stockholm
Type of Material
Journal Article
Publisher
American Chemical Society
Journal
ACS Omega
Volume
3
Issue
3
Start Page
3165
End Page
3172
Copyright (Published Version)
2018 American Chemical Society
Keywords
  • Power-law analysis

  • Lithium-niobate

  • Surface-enhanced Rama...

  • Polarization

DOI
10.1021/acsomega.7b01285
Language
English
Status of Item
Peer reviewed
ISSN
2470-1343
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Owning collection
Physics Research Collection
Scopus© citations
12
Acquisition Date
Feb 1, 2023
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Views
375
Acquisition Date
Feb 1, 2023
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Downloads
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