Self-assembled structures of polyhedral gold nanocrystals : Shape-directive arrangement and structure-dependent plasmonic enhanced characteristics

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

6 Scopus Citations
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Author(s)

  • Yanting Liu
  • Jun Zhou
  • Lu Zhou
  • Tao Jiang
  • Lucia Petti
  • Pasquale Mormile

Detail(s)

Original languageEnglish
Pages (from-to)57320-57326
Journal / PublicationRSC Advances
Volume6
Issue number62
Publication statusPublished - 2016

Abstract

Polyhedral gold nanocrystals (Au NCs) with quasi-spherical, octahedral and triangle-like morphologies were synthesized using a hydrothermal method, and ordered packing structures were formed by water droplet evaporation-induced deposition. The self-assembled structures of the polyhedral Au NCs exhibit shape-directive arrangement during the building block orientation process, and the structure-dependent plasmonic characteristics of the self-assembled NCs were analysed numerically using the finite element method (FEM). The surface-enhanced Raman scattering (SERS) spectra of the self-assembled structures were measured by choosing 4-mercaptobenzoic acid as the Raman reporter, using an excitation wavelength of 785 nm. Both the theoretical and experimental results show that the self-assembled structures of polyhedral Au NCs have high electric field enhancements and excellent SERS performances, in particular, the octahedron self-assembled structures generate higher plasmonic enhancemence efficiency compared to other close-packed configurations. The superior SERS behaviours can be explained based on the electromagnetic enhancement mechanism and the plasmonic antenna effect of the interstitial hot spots, confirming that the self-assembly structures of polyhedral Au NCs offer an alternate way in the design of plasmonic enhancement substrates, with potential applications in bio-sensing and medical detection.

Citation Format(s)

Self-assembled structures of polyhedral gold nanocrystals : Shape-directive arrangement and structure-dependent plasmonic enhanced characteristics. / Liu, Yanting; Zhou, Jun; Zhou, Lu; Yue-Bun Pun, Edwin; Jiang, Tao; Petti, Lucia; Mormile, Pasquale.

In: RSC Advances, Vol. 6, No. 62, 2016, p. 57320-57326.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review