Color change of toluidine blue induced by polyanionic quantum dots

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

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


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 (US)
Pages (from-to)471-474
Number of pages4
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
StatePublished - Jul 20 2006


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

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry


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