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 language | English |
|---|---|
| Pages (from-to) | 1513-1519 |
| Number of pages | 7 |
| Journal | Journal of Fluorescence |
| Volume | 22 |
| Issue number | 6 |
| Early online date | 28 Jun 2012 |
| DOIs | |
| Publication status | Published - 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