Water-soluble CdTe/ZnS Quantum Dots
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Product Description
Alfa Chemistry provides water-soluble CdTe/ZnS quantum dot products, CdTe as the core, ZnS as the shell layer, the surface of the core/shell type fluorescent nanomaterials wrapped by hydrophilic ligands, quantum yield ≧30%, should be stored away from direct sunlight, 4 degrees sealed in the dark, can provide customers with wavelengths of 538-600 nm, at the same time. You can also consult our customer service staff to customize related products, our products have uniform particle size, broad absorption spectrum, narrow and symmetric emission spectrum, high and stable fluorescence intensity, etc.
Applications
Bioimaging
The synthesis, characterization and biological applications of highly stable CdTe/Zn (CdTe/ZnS) core/shell (CS) quantum dots (QDs) were reported by Saikia et al. CS quantum dots were synthesized using a simple one-pot water method. The synthesized CdTe/ZnS CS QDs exhibit good stability even after 100 days of preparation and show better photoluminescence quantum yields (PLQY) compared to nearly 12% of CdTe QDs only. High-resolution transmission electron microscopy (HR-TEM), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD) analysis confirmed the formation of CdTe/ZnTe CSs. Furthermore, in extending this study to bioimaging of E. coli cells using these QDs samples, it was found that CdTe/ZnS CS QDs showed better results compared to CdTe QDs.
Fig.1 (a) Photographs of quantum dot samples prepared under normal light and (b) UV light (365 nm). (Saikia, 2017)
Fluorescent Probes
Yi proposed a novel CdTe/ZnS quantum dot (QD) probe based on quenching effect for the simple, rapid and specific determination of ammonium in aqueous solution. The QD was modified using 3-mercaptopropionic acid, and the fluorescence response of the CdTe/ZnS QD probe to ammonium was detected by regular quenching. The quenching levels of CdTe/ZnS QD showed good linearity between 4.0 × 10-6 and 5.0 × 10-4 mol/L with ammonium concentration; the limit of detection was 3.0 × 10-7 mol/L. The ammonium content in the soil samples was examined to determine the practical application of the QD probe and to describe the possible quenching.
Fig.2 Transmission electron microscopy (TEM) image of the CdTe/ZnS QDs. (Yi, 2016)
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References
- Saikia, D. , et al. Aqueous synthesis of highly stable CdTe/ZnS Core/Shell quantum dots for bioimaging. Luminescence, 2017.
- Yi, and Kui-Yu. CdTe/ZnS quantum dots as fluorescent probes for ammonium determination. Luminescence, 2016, 4, 31:952-957.
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