CdTe/ZnS Quantum Dots
Product Description
Alfa Chemistry offers CdTe/CdS core-shell quantum dots with an emission range of 538 nm to 600 nm. These quantum dots consist of CdTe as the core and CdS as the shell, with the QDs surface surrounded by hydrophilic groups. They have a broad absorption spectrum but a narrow and symmetric emission spectrum, along with uniform particle size, biocompatibility, high and stable fluorescence intensity, and high quantum fields. Our CdS quantum dots can be used for highly sensitive cell imaging, photovoltaic devices, solar cells, and light-emitting devices.
Our products include water-soluble CdTe/ZnS quantum dots and water-soluble CdTe/ZnS/CdS quantum dots.
Features
High and stable fluorescence intensity
Broad absorption spectrum
Uniform particle size
Biocompatibility
Applications
Fluorescent Probes
The fluorescence emission spectra of CdTe/ZnS quantum dots were found to overlap with the absorption spectra of malachite green, and the quantum dots and malachite green could be combined by electrostatic attraction to meet the conditions of fluorescence resonance energy transfer. The system was used for the determination of malachite green content. It was found that the fluorescence burst degree of the system showed a good linear relationship with the concentration of malachite green in Tris-HCl buffer solution at pH 8.0 when the concentration of quantum dots was 1.6×10-4 mol/L. The linear range was 0.048-3.2 μmol/L with the correlation coefficient of 0.9993, and the detection limit of the method was 0.0158 μmol/L. The The method has been successfully used for the determination of actual water samples with the spiked recoveries of 99.3%~102%.
Fig. 1 TEM image of CdTe/ZnS QDs. (Chen et al., 2013)
Fluorescent Nanosensors
Epirubicin (EPI) is one of the standard anticancer drugs used in the treatment of various cancers. However, EPI accumulation in the body can be highly toxic and cause unavoidable damage to organs. Fluorescence is an efficient method compared to traditional liquid chromatography, capillary electrophoresis and electrochemical methods. A novel quantum dot-based fluorescent nanosensor CMC-CdTe/ZnS was synthesized by Bardajee et al. The structure of the prepared nanosensor was verified by FT-IR, TGA and TEM analytical methods. In addition, the fluorescence intensity response of CMC-CdTe/ZnS quantum dots in the presence of epi-amycin drug was investigated. According to the obtained results, not only this nanosensor was developed, but also the fluorescence burst phenomenon can be explained by the typical Stern-Volmer equation. The best linear burst equation for the nanosensor in the presence of epirubicin is F0/F = 0.0346Q + 1.08 (R2 = 0.99), and the detection limit of epirubicin at 25 °C is about 0.04 x 10-6 mol/L.
Fig. 2 (a) TEM images of CdTe/ZnS QDs and (b) and CMC-CdTe/ZnS QDs. (Bardajee et al., 2021)
Alfa Chemistry can provide a variety of complex and customized core-shell fluorescent quantum dot products. Our products involve a variety of fluorescent quantum dot products. Alfa Chemistry provides products with high fluorescence quantum yield, stable quality and relatively low price. Our products are constantly updated. If the product you need is not in our catalog, please feel free to contact us, we provide relevant custom services.
References
- Chen X. L., et al. Determination of Malachite Green by Fluorescence Resonance Energy Transfer Quenching Method Based on CdTe/ZnS Dots. Journal of Instrumental Analysis, 2013, 32(07): 840-845.
- Bardajee, G. R. , M. Sharifi , and H. Mahmoodian . Novel CMC-CdTe / ZnS QDs Nanosensor for the Detection of Anticancer Drug Epirubicin[J]. Journal of Fluorescence, 2021:1-8.
* It should be noted that our service is only used for research, not for clinical use.
