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SERS of Individual Nanoparticles on a Mirror: Size Does Matter, but so Does Shape

[Image: see text] Coupling noble metal nanoparticles by a 1 nm gap to an underlying gold mirror confines light to extremely small volumes, useful for sensing on the nanoscale. Individually measuring 10 000 of such gold nanoparticles of increasing size dramatically shows the different scaling of thei...

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Autores principales: Benz, Felix, Chikkaraddy, Rohit, Salmon, Andrew, Ohadi, Hamid, de Nijs, Bart, Mertens, Jan, Carnegie, Cloudy, Bowman, Richard W., Baumberg, Jeremy J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2016
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4916483/
https://www.ncbi.nlm.nih.gov/pubmed/27223478
http://dx.doi.org/10.1021/acs.jpclett.6b00986
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author Benz, Felix
Chikkaraddy, Rohit
Salmon, Andrew
Ohadi, Hamid
de Nijs, Bart
Mertens, Jan
Carnegie, Cloudy
Bowman, Richard W.
Baumberg, Jeremy J.
author_facet Benz, Felix
Chikkaraddy, Rohit
Salmon, Andrew
Ohadi, Hamid
de Nijs, Bart
Mertens, Jan
Carnegie, Cloudy
Bowman, Richard W.
Baumberg, Jeremy J.
author_sort Benz, Felix
collection PubMed
description [Image: see text] Coupling noble metal nanoparticles by a 1 nm gap to an underlying gold mirror confines light to extremely small volumes, useful for sensing on the nanoscale. Individually measuring 10 000 of such gold nanoparticles of increasing size dramatically shows the different scaling of their optical scattering (far-field) and surface-enhanced Raman emission (SERS, near-field). Linear red-shifts of the coupled plasmon modes are seen with increasing size, matching theory. The total SERS from the few hundred molecules under each nanoparticle dramatically increases with increasing size. This scaling shows that maximum SERS emission is always produced from the largest nanoparticles, irrespective of tuning to any plasmonic resonances. Changes of particle facet with nanoparticle size result in vastly weaker scaling of the near-field SERS, without much modifying the far-field, and allows simple approaches for optimizing practical sensing.
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spelling pubmed-49164832016-06-24 SERS of Individual Nanoparticles on a Mirror: Size Does Matter, but so Does Shape Benz, Felix Chikkaraddy, Rohit Salmon, Andrew Ohadi, Hamid de Nijs, Bart Mertens, Jan Carnegie, Cloudy Bowman, Richard W. Baumberg, Jeremy J. J Phys Chem Lett [Image: see text] Coupling noble metal nanoparticles by a 1 nm gap to an underlying gold mirror confines light to extremely small volumes, useful for sensing on the nanoscale. Individually measuring 10 000 of such gold nanoparticles of increasing size dramatically shows the different scaling of their optical scattering (far-field) and surface-enhanced Raman emission (SERS, near-field). Linear red-shifts of the coupled plasmon modes are seen with increasing size, matching theory. The total SERS from the few hundred molecules under each nanoparticle dramatically increases with increasing size. This scaling shows that maximum SERS emission is always produced from the largest nanoparticles, irrespective of tuning to any plasmonic resonances. Changes of particle facet with nanoparticle size result in vastly weaker scaling of the near-field SERS, without much modifying the far-field, and allows simple approaches for optimizing practical sensing. American Chemical Society 2016-05-25 2016-06-16 /pmc/articles/PMC4916483/ /pubmed/27223478 http://dx.doi.org/10.1021/acs.jpclett.6b00986 Text en Copyright © 2016 American Chemical Society This is an open access article published under a Creative Commons Attribution (CC-BY) License (http://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html) , which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
spellingShingle Benz, Felix
Chikkaraddy, Rohit
Salmon, Andrew
Ohadi, Hamid
de Nijs, Bart
Mertens, Jan
Carnegie, Cloudy
Bowman, Richard W.
Baumberg, Jeremy J.
SERS of Individual Nanoparticles on a Mirror: Size Does Matter, but so Does Shape
title SERS of Individual Nanoparticles on a Mirror: Size Does Matter, but so Does Shape
title_full SERS of Individual Nanoparticles on a Mirror: Size Does Matter, but so Does Shape
title_fullStr SERS of Individual Nanoparticles on a Mirror: Size Does Matter, but so Does Shape
title_full_unstemmed SERS of Individual Nanoparticles on a Mirror: Size Does Matter, but so Does Shape
title_short SERS of Individual Nanoparticles on a Mirror: Size Does Matter, but so Does Shape
title_sort sers of individual nanoparticles on a mirror: size does matter, but so does shape
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4916483/
https://www.ncbi.nlm.nih.gov/pubmed/27223478
http://dx.doi.org/10.1021/acs.jpclett.6b00986
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