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SERS of individual nanoparticles on a mirror : size does matter, but so does shape

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Benz_2016_JPCL_SERS_CC.pdf (5.537Mb)
Date
16/06/2016
Author
Benz, Felix
Chikkaraddy, Rohit
Salmon, Andrew
Ohadi, Hamid
De Nijs, Bart
Mertens, Jan
Carnegie, Cloudy
Bowman, Richard W.
Baumberg, Jeremy J.
Keywords
QC Physics
Materials Science(all)
DAS
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Abstract
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.
Citation
Benz , F , Chikkaraddy , R , Salmon , A , Ohadi , H , De Nijs , B , Mertens , J , Carnegie , C , Bowman , R W & Baumberg , J J 2016 , ' SERS of individual nanoparticles on a mirror : size does matter, but so does shape ' , Journal of Physical Chemistry Letters , vol. 7 , no. 12 , pp. 2264-2269 . https://doi.org/10.1021/acs.jpclett.6b00986
Publication
Journal of Physical Chemistry Letters
Status
Peer reviewed
DOI
https://doi.org/10.1021/acs.jpclett.6b00986
ISSN
1948-7185
Type
Journal article
Rights
Copyright © 2016 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Description
The authors thank Javier Aizpurua (CSIC − UPV/EHU/DIPC) for helpful discussions. We acknowledge financial support from EPSRC Grants EP/G060649/1, EP/K028510/1, EP/L027151/1, ERC Grant LINASS 320503. F.B. acknowledges support from the Winton Programme for the Physics of Sustainability. R.C. acknowledges support from the Dr. Manmohan Singh scholarship from St. John’s College.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/12561

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