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Tuneable 2D self-assembly of plasmonic nanoparticles at liquid | liquid interfaces

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Title: Tuneable 2D self-assembly of plasmonic nanoparticles at liquid | liquid interfaces
Authors: Velleman, L
Sikdar, D
Turek, V
Kucernak, A
Roser, SJ
Kornyshev, AA
Edel, JB
Item Type: Journal Article
Abstract: Understanding the structure and assembly of nanoparticles at liquid | liquid interfaces is paramount to their integration into devices for sensing, catalysis, electronics and optics. However, many difficulties arise when attempting to resolve the structure of such interfacial assemblies. In this article we use a combination of X-ray diffraction and optical reflectance to determine the structural arrangement and plasmon coupling between 12.8 nm diameter gold nanoparticles assembled at a water | 1,2-dichloroethane interface. The liquid | liquid interface provides a molecularly flat and defect-correcting platform for nanoparticles to self-assemble. The amount of nanoparticles assembling at the interface can be controlled via the concentration of electrolyte within either the aqueous or organic phase. At higher electrolyte concentration more nanoparticles can settle at the liquid | liquid interface resulting in a decrease in nanoparticle spacing as observed from X-ray diffraction experiments. The coupling of plasmons between the nanoparticles as they come closer together is observed by a red-shift in the optical reflectance spectra. The optical reflectance and the X-ray diffraction data are combined to introduce a new ‘plasmon ruler’. This allows extraction of structural information from simple optical spectroscopy techniques, with important implications in understanding the structure of nanoparticle films at liquid interfaces and their self-assembly.
Issue Date: 8-Oct-2016
Date of Acceptance: 8-Oct-2016
URI: http://hdl.handle.net/10044/1/41456
DOI: https://dx.doi.org/10.1039/C6NR05081F
ISSN: 2040-3372
Publisher: Royal Society of Chemistry
Start Page: 19229
End Page: 19241
Journal / Book Title: Nanoscale
Volume: 8
Copyright Statement: © The Royal Society of Chemistry 2016. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nanoscale, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://dx.doi.org/10.1039/C6NR05081F
Sponsor/Funder: Commission of the European Communities
Engineering & Physical Science Research Council (EPSRC)
Commission of the European Communities
Funder's Grant Number: 279818
Keywords: Nanoscience & Nanotechnology
10 Technology
02 Physical Sciences
03 Chemical Sciences
Publication Status: Published
Appears in Collections:Chemistry
Faculty of Natural Sciences