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

Felix Benz; Rohit Chikkaraddy; Andrew Salmon; Hamid Ohadi; Bart De Nijs; Jan Mertens; Cloudy Carnegie; Richard W. Bowman; Jeremy J. Baumberg

doi:10.1021/acs.jpclett.6b00986

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

Felix Benz, Rohit Chikkaraddy, Andrew Salmon, Hamid Ohadi, Bart De Nijs, Jan Mertens, Cloudy Carnegie, Richard W. Bowman, Jeremy J. Baumberg^*

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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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.

Original language	English
Pages (from-to)	2264-2269
Number of pages	6
Journal	Journal of Physical Chemistry Letters
Volume	7
Issue number	12
Early online date	25 May 2016
DOIs	https://doi.org/10.1021/acs.jpclett.6b00986
Publication status	Published - 16 Jun 2016

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Benz_2016_JPCL_SERS_CC
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.
Final published version, 5.54 MBLicence: CC BY

Research data supporting "SERS of Individual Nanoparticles on a Mirror: Size Does Matter, but so Does Shape"
Benz, F. (Creator), Chikkaraddy, R. (Creator), Salmon, A. (Creator), Ohadi, H. (Creator), De Nijs, B. (Creator), Mertens, J. (Creator), Carnegie, C. (Creator), Bowman, R. W. (Creator) & Baumberg, J. J. (Creator), University of Cambridge, 30 May 2016
DOI: 10.17863/CAM.54
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@article{82470c849702448fa7254028b81bd87e,

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

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.",

author = "Felix Benz and Rohit Chikkaraddy and Andrew Salmon and Hamid Ohadi and {De Nijs}, Bart and Jan Mertens and Cloudy Carnegie and Bowman, {Richard W.} and Baumberg, {Jeremy J.}",

note = "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{\textquoteright}s College.",

year = "2016",

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doi = "10.1021/acs.jpclett.6b00986",

language = "English",

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journal = "Journal of Physical Chemistry Letters",

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TY - JOUR

T1 - SERS of individual nanoparticles on a mirror

T2 - size does matter, but so does shape

AU - Benz, Felix

AU - Chikkaraddy, Rohit

AU - Salmon, Andrew

AU - Ohadi, Hamid

AU - De Nijs, Bart

AU - Mertens, Jan

AU - Carnegie, Cloudy

AU - Bowman, Richard W.

AU - Baumberg, Jeremy J.

N1 - 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.

PY - 2016/6/16

Y1 - 2016/6/16

N2 - 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.

AB - 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.

U2 - 10.1021/acs.jpclett.6b00986

DO - 10.1021/acs.jpclett.6b00986

M3 - Article

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SN - 1948-7185

VL - 7

SP - 2264

EP - 2269

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

IS - 12

ER -

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

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Research data supporting "SERS of Individual Nanoparticles on a Mirror: Size Does Matter, but so Does Shape"

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