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 language | English |
|---|---|
| Pages (from-to) | 771-8 |
| Number of pages | 8 |
| Journal | Journal of Fluorescence |
| Volume | 22 |
| Issue number | 2 |
| Early online date | 5 Nov 2011 |
| DOIs | |
| Publication status | Published - 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