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Issue 46, 2016
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Tuneable 2D self-assembly of plasmonic nanoparticles at liquid|liquid interfaces

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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.

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

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Publication details

The article was received on 24 Jun 2016, accepted on 08 Oct 2016 and first published on 08 Oct 2016

Article type: Paper
DOI: 10.1039/C6NR05081F
Author version available: Download Author version (PDF)
Citation: Nanoscale, 2016,8, 19229-19241
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    Tuneable 2D self-assembly of plasmonic nanoparticles at liquid|liquid interfaces

    L. Velleman, D. Sikdar, V. A. Turek, A. R. Kucernak, S. J. Roser, A. A. Kornyshev and J. B. Edel, Nanoscale, 2016, 8, 19229
    DOI: 10.1039/C6NR05081F

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