Interaction of CdTe Quantum Dots with 2,2-Diphenyl-1-Picrylhydrazyl Free Radical: A Spectroscopic, Fluorimetric and Kinetic Study

Oluwasesan Adegoke, Wadzanai Chidawanyika, Tebello Nyokong (Lead / Corresponding author)

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The interaction of 2,2-diphenyl-1-picrylhydrazyl (DPPH(·) free radical with thiol-capped CdTe quantum dots (QDs) has been studied by UV-vis spectroscopy, steady state and time resolved fluorescence measurements. Addition of DPPH(·) radical to CdTe QDs resulted in fluorescence quenching. The interaction occurs through static quenching as this was confirmed by fluorescence lifetime measurements. Time course absorption studies indicates that DPPH(·) may be reduced by interaction with QDs to the substituted hydrazine form (2,2-diphenyl-1-picrylhydrazine) DPPH-H. The mechanism of fluorescence quenching of CdTe QDs by DPPH(·) is proposed.

Original languageEnglish
Pages (from-to)771-8
Number of pages8
JournalJournal of Fluorescence
Volume22
Issue number2
Early online date5 Nov 2011
DOIs
Publication statusPublished - Mar 2012

Keywords

  • Biphenyl Compounds/chemistry
  • Cadmium Compounds/chemistry
  • Fluorescence
  • Fluorometry
  • Free Radicals/chemistry
  • Kinetics
  • Picrates/chemistry
  • Quantum Dots
  • Spectrometry, Fluorescence
  • Spectrophotometry, Ultraviolet
  • Tellurium/chemistry

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