Probing the quenching of CdSe/ZnS qdots by Au, Au/Ag, and Au/Pd nanoparticles

Hyunjoo Han, Valerie Valle, Mathew M. Maye

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

The resonance energy transfer between CdSe/ZnS quantum dots (qdots) and three metallic nanoparticles (NPs) with different surface plasmon resonance (SPR) characteristics were studied. Gold, gold/silver and gold/palladium NPs were used as energy acceptors for qdots with donor emission at 570nm. Due to the different spectral overlaps between the SPR signatures and qdot emission, varied energy transfer characteristics were observed. The energy transfer was quantified via the SternVolmer relationship, since in this study the energy transfer was collision based. The Au/Ag and Au/Pd NPs in particular showed high K SV values, while the Au NPs showed much lower energy transfer efficiency. Since the NPs used in this study were relatively large (d1520nm), the experimental system was also influenced by the NP extinction coefficients of 10 8M 1cm 1. To address this potential inner filter effect, the quenching profiles were normalized by SPR transmittance. The results are important to the field, as many of these classes of nanomaterials are being employed in energy transfer based studies, as well as in colorimetric sensing.

Original languageEnglish (US)
Article number435401
JournalNanotechnology
Volume23
Issue number43
DOIs
StatePublished - Nov 2 2012

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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