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

DOI: 10.1039/C6NR05081F DOI Help

Authors: Leonora Velleman (Imperial College London) , Debabrata Sikdar (Department of Chemistry, Faculty of Natural Sciences, Imperial College London) , Vladimir A. Turek (Imperial College London) , Anthony R. Kucernak (Department of Chemistry, Faculty of Natural Sciences, Imperial College London) , Stephen J. Roser (University of Bath) , Alexei A. Kornyshev (Department of Chemistry, Faculty of Natural Sciences, Imperial College London) , Joshua B. Edel (Department of Chemistry, Faculty of Natural Sciences, Imperial College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nanoscale

State: Published (Approved)
Published: October 2016
Diamond Proposal Number(s): 9532 , 11180

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 plasmonic coupling 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 for understanding the structure of self-assembled nanoparticle films at liquid interfaces.

Subject Areas: Chemistry, Physics


Instruments: I07-Surface & interface diffraction