A Comparative Study on the Sensitive Detection of Hydroxyl Radical Using Thiol-capped CdTe and CdTe/ZnS Quantum Dots

Oluwasesan Adegoke, Tebello Nyokong (Lead / Corresponding author)

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Four types of water-soluble luminescent quantum dots (QDs) whose surface was functionlaized with thioglycolic acid (TGA), 3-mercaptopropionic acid (MPA), or glutathione (GSH), were investigated for the sensitive and selective detection of hydroxyl radical (·OH) in aqueous media. It was found that the type of capping agent and QD influenced the sensitivity of the probe. The order of sensitivity of the probe was: GSH-CdTe@ZnS > MPA-CdTe@ZnS > TGA-CdTe > MPA-CdTe QDs. Under the optimum conditions, a limit of detection as low as 8.5 × 10(-8) M was obtained using GSH-CdTe@ZnS. The effects of foreign reactive oxygen species and the Fenton reactants and products as possible interferences on the proposed probe were negligible for CdTe@ZnS QDs. Besides, experimental results indicated that CdTe@ZnS QDs were more attractive for the selective recognition of ·OH than CdTe QDs. The mechanistic reaction pathway between the QDs and ·OH is proposed.

Original languageEnglish
Pages (from-to)1513-1519
Number of pages7
JournalJournal of Fluorescence
Volume22
Issue number6
Early online date28 Jun 2012
DOIs
Publication statusPublished - Nov 2012

Keywords

  • Buffers
  • Cadmium Compounds/chemistry
  • Chemistry Techniques, Analytical/instrumentation
  • Hydrogen-Ion Concentration
  • Hydroxyl Radical/analysis
  • Optical Phenomena
  • Quantum Dots
  • Spectrometry, Fluorescence
  • Sulfhydryl Compounds/chemistry
  • Sulfides/chemistry
  • Tellurium/chemistry
  • Zinc Compounds/chemistry

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