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Plasmonic Oligomers: The Role of Polymer-Solvent Interactions

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Recent advances in the colloidal synthesis of plasmonic metal nanostructures enable their fabrication with precisely engineered complex size/shape/composition, thereby providing an efficient alternative to top-down processing approach. Moreover, the unique optical response of these noble metal colloids were often found to be highly dependent on the dielectric environment as well as their inter-particle spacing due to organized associations or the solvent induced self-assembly process. Controlling the stable morphology of these nanoparticle assemblies, right from the isolated single particle configuration to the dimer, trimer, oligomer-type geometrical arrangement, so as to enhance the plasmonic coupling effects remains a challenge, despite enormous efforts applied in the production of different highly (non)-symmetric nanostructures. Herein, we propose a simple yet versatile seed mediated chronological synthesis procedure, utilizing the robust nature of gold nanoparticles stabilized with PVP, but with tailored affinity in different solvents, facilitating the interparticle number and spacing/position in a close-packed cluster like formation initiated by the addition of Ag salt preferably under basic pH conditions. Such kind of chemically synthesized nanoparticle clusters can easily serve as building blocks for new metamaterials as well as the basis for nanophotonic structures.
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Keywords: Cluster; Gold Nanoparticles; PVP; Plasmonics

Document Type: Research Article

Affiliations: Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India

Publication date: November 1, 2016

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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