A selective determination of copper ions in water samples based on the fluorescence quenching of thiol‐capped CdTe quantum dots |
| |
| Authors: | Piyaluk Nurerk Proespichaya Kanatharana Opas Bunkoed |
| |
| Affiliation: | 1. Trace Analysis and Biosensor Research Center, Prince of Songkla University, Hat Yai, Songkhla, Thailand;2. Center of Excellence for Innovation in Chemistry, Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand |
| |
| Abstract: | CdTe quantum dots (QDs) capped with different stabilizers, i.e. thioglycolic acid (TGA), 3‐mercaptopropionic acid (MPA) and glutathione (GSH) were investigated as fluorescent probes for the determination of Cu2+. The stabilizer was shown to play an important role in both the sensitivity and selectivity for the determination of Cu2+. TGA‐capped CdTe QDs showed the highest sensitivity, followed by the MPA and GSH‐capped CdTe QDs, respectively. The TGA‐ and MPA‐capped CdTe QDs were not selective for Cu2+ that was affected by Ag+. The GSH‐capped CdTe QDs were insensitive to Ag+ and were used to determine Cu2+ in water samples. Under optimal conditions, quenching of the fluorescence intensity (F0/F) increased linearly with the concentration of Cu2+ over a range of 0.10–4.0 µg/mL and the detection limit was 0.06 µg/mL. The developed method was successfully applied to the determination of Cu2+ in water samples. Good recoveries of 93–104%, with a relative standard deviation of < 6% demonstrated that the developed simple method was accurate and reliable. The quenching mechanisms were also described. Copyright © 2015 John Wiley & Sons, Ltd. |
| |
| Keywords: | quantum dots copper ion quenching |
|
|
