Controlled Overgrowth of Five-Fold Concave Nanoparticles into Plasmonic Nanostars and Their Single-Particle Scattering Properties

J. Jesús Velázquez-Salazar, Lourdes Bazán-Díaz, Qingfeng Zhang, Rubén Mendoza-Cruz, Luis Montaño-Priede, Grégory Guisbiers, Nicolas Large, Stephan Link, Miguel José-Yacamán

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Growth of anisotropic nanostructures enables the manipulation of optical properties across the electromagnetic spectrum by fine morphological tuning of the nanoparticles. Among them, stellated metallic nanostructures present enhanced properties owing to their complex shape, and hence, the control over the final morphology becomes of great importance. Herein, a seed-mediated method for the high-yield production of goldrich-copper concave branched nanostructures and their structural and optical characterization is reported. The synthesis protocol enabled excellent control and tunability of the final morphology, from concave pentagonal nanoparticles to five-fold branched nanoparticles, named "nanostars". The anisotropic shape was achieved via kinetic control over the synthesis conditions by selective passivation of facets using a capping agent and assisted by the presence of copper chloride ions, both having a crucial impact over the final structure. Optical extinction measurements of nanostars in solution indicated a broad spectral response, hiding the properties of the individual nanostars. Hence, single-particle scattering measurements of individual concave pentagonal nanoparticles and concave nanostars were performed to determine the origin of the multiple plasmon bands by correlation with their morphological features, following their growth evolution. Finite-difference time-domain calculations delivered insights into the geometry-dependent plasmonic properties of concave nanostars and their packed aggregates. Our results uncover the intrinsic scattering properties of individual nanostars and the origin of the broad spectral response, which is mostly due to z-direction packed aggregates.

Original languageEnglish (US)
Pages (from-to)10113-10128
Number of pages16
JournalACS Nano
Volume13
Issue number9
DOIs
StatePublished - Sep 24 2019
Externally publishedYes

Keywords

  • anisotropic nanoparticles
  • concave nanostars
  • finite-difference time-domain
  • five-fold twinned structures
  • kinetic control
  • localized surface plasmons
  • single-particle scattering

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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