Color change of toluidine blue induced by polyanionic quantum dots

Kerim M. Gattás-Asfura, David M. Naistat, Roger Leblanc

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The surface of 4.1 nm CdSe/ZnS, core/shell, quantum dots was stabilized with cysteine (Cys) or thioglycolic acid (TGA) ligands. Electrostatic interactions between the polyanionic quantum dots (QDs) and positively charged toluidine blue were studied by UV-vis absorption spectroscopy and Förster resonance energy transfer. The surface net charge on the QDs highly correlated with the dye's degree of metachromasia, which served as a direct and convenient surface electrostatic probe for negatively-charged nanoparticles.

Original languageEnglish
Pages (from-to)471-474
Number of pages4
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume282-283
DOIs
StatePublished - Jul 20 2006

Fingerprint

Tolonium Chloride
Semiconductor quantum dots
quantum dots
Color
color
cysteine
electrostatic probes
Coulomb interactions
Ultraviolet spectroscopy
Absorption spectroscopy
Energy transfer
Cysteine
Electrostatics
absorption spectroscopy
Coloring Agents
Dyes
dyes
energy transfer
Ligands
electrostatics

Keywords

  • Metachromasia
  • Quantum dots
  • Surface net charge
  • Toluidine blue

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Color change of toluidine blue induced by polyanionic quantum dots. / Gattás-Asfura, Kerim M.; Naistat, David M.; Leblanc, Roger.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 282-283, 20.07.2006, p. 471-474.

Research output: Contribution to journalArticle

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