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

Title: Single-Molecule Nonresonant Wide-Field Surface-Enhanced Raman Scattering from Ferroelectrically Defined Au Nanoparticle Microarrays
Authors: Al-Shammari, Rusul M.Al-Attar, NebrasManzo, MicheleGallo, KatiaRodriguez, Brian J.Rice, James H.
Permanent link: http://hdl.handle.net/10197/12002
Date: 15-Mar-2018
Online since: 2021-03-02T17:10:51Z
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.
Funding Details: Science Foundation Ireland
Funding Details: 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 analysisLithium-niobateSurface-enhanced Raman scatteringPolarization
DOI: 10.1021/acsomega.7b01285
Language: en
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/
Appears in Collections:Conway Institute Research Collection
Physics Research Collection

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