Affordable Access

deepdyve-link
Publisher Website

Fluorescence properties of hydrophilic semiconductor nanoparticles with tridentate polyethylene oxide ligands.

Authors
  • Thiry, Marc1
  • Boldt, Klaus
  • Nikolic, Marija S
  • Schulz, Florian
  • Ijeh, Michael
  • Panicker, Andjana
  • Vossmeyer, Tobias
  • Weller, Horst
  • 1 Institute for Physical Chemistry, University of Hamburg, Grindelallee 177, 20146 Hamburg, Germany. , (Germany)
Type
Published Article
Journal
ACS Nano
Publisher
American Chemical Society
Publication Date
Jun 28, 2011
Volume
5
Issue
6
Pages
4965–4973
Identifiers
DOI: 10.1021/nn201065y
PMID: 21619021
Source
Medline
License
Unknown

Abstract

In this contribution a facile, one-step synthesis of tridentate thiol-functionalized PEO ligands and their ability to stabilize CdSe/CdS/ZnS core-shell-shell nanoparticles in aqueous media are described. The PEO-coated quantum dots show colloidal stability as well as preserved fluorescence even at very low concentrations of a few nM. For improved ligand attachment and enhanced fluorescence properties a method for ligand exchange was developed, which includes formation of a ligand zinc complex before the actual exchange reaction. The stability and fluorescence properties in various aqueous buffers and cell media and at pH values down to pH 3 were investigated. The firm binding of the tridentate ligands to the particle surface makes this ligand-particle system a promising tool for biological applications. In addition, activation of the ligands' terminal hydroxyl group for covalent biofunctionalization by esterification with succinic acid is reported.

Report this publication

Statistics

Seen <100 times