Structural and optical properties of self-assembled chains of plasmonic nanocubes

Anna Klinkova, Héloïse Thérien-Aubin, Aftab Ahmed, Dmytro Nykypanchuk, Rachelle M. Choueiri, Brandon Gagnon, Anastasiya Muntyanu, Oleg Gang, Gilbert C. Walker, Eugenia Kumacheva

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

Solution-based linear self-assembly of metal nanoparticles offers a powerful strategy for creating plasmonic polymers, which, so far, have been formed from spherical nanoparticles and cylindrical nanorods. Here we report linear solution-based self-assembly of metal nanocubes (NCs), examine the structural characteristics of the NC chains, and demonstrate their advanced optical characteristics. In comparison with chains of nanospheres with similar dimensions, composition, and surface chemistry, predominant face-to-face assembly of large NCs coated with short polymer ligands led to a larger volume of hot spots in the chains, a nearly uniform E-field enhancement in the gaps between colinear NCs, and a new coupling mode for NC chains due to the formation of a Fabry-Perot resonator structure formed by face-to-face bonded NCs. The NC chains exhibited stronger surface-enhanced Raman scattering in comparison with linear assemblies of nanospheres. The experimental results were in agreement with finite difference time domain simulations.

Original languageEnglish (US)
Pages (from-to)6314-6321
Number of pages8
JournalNano letters
Volume14
Issue number11
DOIs
StatePublished - Nov 12 2014
Externally publishedYes

Keywords

  • Nanoparticle
  • SERS
  • nanocube
  • nanoparticle chain
  • nanosphere
  • plasmonics
  • self-assembly

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