Plasmon dynamics in colloidal Au2Cd Alloy-CdSe core/shell nanocrystals

Pablo Guardia, Kseniya Korobchevskaya, Alberto Casu, Alessandro Genovese, Liberato Manna*, Alberto Comin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Metal-semiconductor nanocrystal heterostructures are model systems for understanding the interplay between the localized surface plasmon resonances in the metal domain and the relaxation of the excited carriers in the semiconductor domain. Here we report the synthesis of colloidal Au2Cd (core)/CdSe (shell) nanocrystal heterostructures, which were characterized extensively with several structural and optical techniques, including time-resolved fluorescence and broad-band transient absorption spectroscopy (both below and above the CdSe band gap). The dynamics of the transient plasmon peak was dominated by the relaxation of hot carriers in the metal core, its spectral shape was independent of the pump wavelength, and the bleaching lifetime was about half a picosecond, comparable with the value found in the AuCd seeds used for the synthesis.

Original languageEnglish (US)
Pages (from-to)1045-1053
Number of pages9
JournalACS Nano
Volume7
Issue number2
DOIs
StatePublished - Feb 26 2013
Externally publishedYes

Keywords

  • charge transfer
  • colloidal nanocrystal heterostructures
  • fluorescence quenching
  • metal-semiconductor nanojunctions
  • plasmon bleaching dynamics
  • plasmonic materials

ASJC Scopus subject areas

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

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