Fluorescence properties of hydrophilic semiconductor nanoparticles with tridentate polyethylene oxide ligands

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Autor/in:
Erscheinungsjahr:
2011
Medientyp:
Text
Schlagworte:
  • Quantum Dots
  • Semiconductor quantum dots
  • CdSe/ZnS quantum
  • Nanocrystals
  • Semiconductor Quantum Dots
  • Zinc Sulfide
  • Quantum Dots
  • Semiconductor quantum dots
  • CdSe/ZnS quantum
  • Nanocrystals
  • Semiconductor Quantum Dots
  • Zinc Sulfide
Beschreibung:
  • 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. © 2011 American Chemical Society.
Lizenz:
  • info:eu-repo/semantics/closedAccess
Quellsystem:
Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/f1c44094-e4b7-4796-9418-1a999d0844ee