PH-dependent network formation of quantum dots and fluorescent quenching by Au nanoparticle embedding

Shota Sekiguchi, Kenichi Niikura, Naoki Iyo, Yasutaka Matsuo, Asumi Eguchi, Takakazu Nakabayashi, Nobuhiro Ohta, Kuniharu Ijiro

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

A simple approach to the creation of colloidal assemblies is in high demand for the development of functional devices. Here, we present the preparation of CdTe-QD (quantum dot) networks in as little as 1 day simply by pH modification without the use of oxidants. The QD network was tractable in water and casting from a droplet produced a porous networked film on both hydrophobic and hydrophilic solid substrates. Further, we found that citrate-protected gold nanoparticles (AuNPs, d = 5 nm) could be incorporated into the QD networks to afford a QD/Au composite network, and that the fluorescence from the QDs was largely decreased by the addition of a small proportion of AuNPs (QD:AuNP = 99.4:0.6), probably due to the efficient charge transfer through the network. These data indicate that our method is suitable for application to the creation of metal/QD hybrid materials that can be integrated into wet-based processes.

Original languageEnglish
Pages (from-to)4169-4173
Number of pages5
JournalACS Applied Materials and Interfaces
Volume3
Issue number11
DOIs
Publication statusPublished - 2011 Nov 23
Externally publishedYes

Keywords

  • CdTe
  • fluorescence quenching
  • gold nanoparticle
  • nanoparticle assembly
  • quantum dot
  • self-assembly

ASJC Scopus subject areas

  • Materials Science(all)

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