Monitoring plasmon coupling and SERS enhancement through in situ nanoparticle spacing modulation

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Title: Monitoring plasmon coupling and SERS enhancement through in situ nanoparticle spacing modulation
Author(s): Velleman, L
Scarabelli, L
Sikdar, D
Kornyshev, AA
Liz-Marzan, LM
Edel, JB
Item Type: Journal Article
Abstract: Self-assembled nanoparticle (NP) arrays at liquid interfaces provide a unique optical response which has opened the door to new tuneable metamaterials and for sensing and optical applications. NPs can spontaneously assemble at the liquid-liquid interface, forming an ordered, self-healing, low-defect 2D film. The close proximity of the NPs at the interface results in collective plasmonic modes with a spectral response dependent on the distance between the NPs and induces large field enhancements within the gaps. In this study, we assembled spherical and rod-shaped gold NPs with the aim of improving our understanding of NP assembly processes at liquid interfaces, working towards finely controlling their structure and producing tailored optical and enhanced Raman signals. We systematically tuned the assembly and spacing between NPs through increasing or decreasing the degree of electrostatic screening between NPs with the addition of electrolyte or pH adjustment. The in situ modulation of nanoparticle positioning on the same sample allowed us to monitor plasmon coupling and the resulting SERS enhancement processes in real time, with sub-nm precision.
Publication Date: 29-Jun-2017
Date of Acceptance: 28-Jun-2017
URI: http://hdl.handle.net/10044/1/50073
DOI: https://dx.doi.org/10.1039/C7FD00162B
ISSN: 1364-5498
Publisher: Royal Society of Chemistry
Start Page: 67
End Page: 83
Journal / Book Title: Faraday Discussions
Volume: 205
Copyright Statement: © The Royal Society of Chemistry 2017
Sponsor/Funder: Commission of the European Communities
Engineering & Physical Science Research Council (EPSRC)
Commission of the European Communities
Commission of the European Communities
Commission of the European Communities
Funder's Grant Number: 279818
EP/L02098X/1
658544
724300
751763
Keywords: 0306 Physical Chemistry (Incl. Structural)
0904 Chemical Engineering
Chemical Physics
Publication Status: Published
Embargo Date: 2018-06-29
Appears in Collections:Chemistry
Faculty of Natural Sciences



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