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Fluorescence Quenching of Dendrimer-Encapsulated CdS Quantum Dots for the Detection of H2O2
| Journal | Bull. Korean Chem. Soc. |
|---|---|
| Author | Hyojung Lim, Hai Dong Kim, Joohoon Kim |
| Citation | Bull. Korean Chem. Soc., 2016, 37, 254?257 |
| DOI | https://doi.org/10.1002/bkcs.10655 |
Here, we report H2O2-sensitive fluorescence of CdS QDs encapsulated inside amine-terminated sixth-generation polyamidoamine dendrimers (G6-NH2), which we utilized for the detection of H2O2. Specifically, we synthesized a set of CdS QDs with different structural and optical properties by adjusting the molar ratios (i.e., n = Cd2+/G6-NH2) between Cd2+ ions and G6-NH2 dendrimers. As the Cd2+/G6-NH2 ratio (n) increases from 16 to 128, the size of the resulting CdS QDs increases, as was confirmed by UV?Vis spectroscopy, fluorescence spectroscopy, dynamic light scattering (DLS) measurements, and transmission electron microscopy (TEM). Importantly, the CdS QD with the Cd2+/G6-NH2ratio (n) of 64 exhibited significant fluorescence quenching in the presence of H2O2 as well as the strongest fluorescence among the set of CdS QDs. To the best of our knowledge, this is the first report of the H2O2-sensitive fluorescence of the dendrimer-encapsulated CdS QDs, which enables the use of the CdS QD (n = 64) as a fluorescent reporter for the analysis of H2O2.
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