Highly controlled plasmonic emission enhancement from metal-semiconductor quantum dot complex nanostructures

Hiroyuki Naiki, Akito Masuhara, Sadahiro Masuo, Tsunenobu Onodera, Hitoshi Kasai, Hidetoshi Oikawa

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

We have fabricated well-defined nanostructures such as SiO 2-coated Ag nanoparticles (NPs) connected with quantum dots (QDs) (Ag/SiO2-QDs) so as to control the fluorescence enhancement induced by localized surface plasmon resonance. Namely, the distance between Ag NP and QD should be noted as a controllable model to investigate the fluorescence enhancement effect. Actually, highly monodispersed Ag NP as a core was first coated with five thicknesses of SiO2 as a shell, and then QDs were specifically adsorbed onto the surface of the amino-functionalized SiO 2-coated Ag NPs. As a result, the fluorescence intensity increased with the shell thickness as a result of excitation enhancement. On the other hand, the fluorescence intensity decreased when the shell thickness became thinner because of the induced quenching. Therefore, the distance between Ag NPs and QDs should be optimized to control and enhance the fluorescence intensity.

Original languageEnglish
Pages (from-to)2455-2459
Number of pages5
JournalJournal of Physical Chemistry C
Volume117
Issue number6
DOIs
Publication statusPublished - 2013 Feb 14

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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