Oil Dispersible CdSeTe/ZnS Quantum Dots
Product Description
Alfa Chemistry offers oil dispersible CdSeTe/ZnS quantum dots with fluorescence emission wavelengths of 640-820 nm, uniform particle size, biocompatible and electrochemiluminescence, high and stable fluorescence intensity, and high quantum fields. These quantum dots are fluorescent nanomaterials consisting of CdSeTe as the core and ZnS as the shell layer, and the quantum dot surface is surrounded by hydrophobic ligands. CdSeTe/ZnS Quantum dots are commonly used in solar cells, light-emitting devices and bioluminescent labels.
Features
Uniform particle size
Biocompatibility
High and stable fluorescence intensity
High quantum field
Applications
Signal Amplifier
Cui et al. proposed a fluorescence resonance energy transfer (FRET) technique to detect miR155 using core-shell CdSeTe/ZnS quantum dots (QDs) as signal reporters and target recovery strategies as signal amplifiers. In the presence of miR155, a partial hairpin probe (HP) immobilized on the surface of gold nanoparticles (AuNPs)@SiO2 can be hybridization. Then, with the help of exonuclease III, many H1-AuNPs@SiO2 can be generated. with the helper chain A2 attached, H1-AuNPs@SiO2 binds to A1-QDs, and then the fluorescence (FL) signal of QDs is quenched by AuNPs@SiO2 via FRET. The more miR155 was present in the solution, the weaker the detected FL signal was. A linear response range of 0.01 fM to 1 nM and a low detection limit of 3 aM were obtained using the proposed method. Furthermore, this method showed high specificity and satisfactory recovery between 93 and 105% in real human serum samples, illustrating its great potential for practical applications.
Fig.1 Principle of FL sensing for miR155. (Cui et al., 2019)
Fluorescent Probes
Li et al. synthesized glutathione (GSH)-coated CdSeTe/ZnS quantum dots with high fluorescence quantum yield by aqueous phase and characterized their optical properties and structures by UV spectroscopy, fluorescence spectroscopy, transmission electron microscopy and electron diffraction (XRD). Based on the specific binding of GSH on the surface of CdSeTe/ZnS quantum dots to As3+ resulting in the quantum dot fluorescence burst, a new method based on CdSeTe/ZnS quantum dots as fluorescent probes for the detection of trace As3+ was constructed. The fluorescence intensity of CdSeTe/ZnS quantum dots was linear in the concentration range of 5.0-100.0 μg/L with a linear correlation coefficient of 0.9984 and a detection limit of 1.0 μg/L. The method can be used for the determination of As3+ in water samples. The method can be used for the determination of As3+ in real water samples.
Fig.2 TEM image of the CdSeTe/ZnS QDs (A) , particle size distribution histogram (B) and the size distribution histogram was obtained by averaging the sizes of 100 particles from the TEM image and HRTEM image of one individual CdSeTe/ZnS QDs (C). (Li et al., 2018)
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
- Yu-Mei, L. , et al. A new fluorescence probe for detection of As~(3+) ions based on glutathione-capped CdSeTe/ZnS quantum dots[J]. Chinese Journal of Analysis Laboratory, 2018.
- Cui, F. , et al. Core-shell CdSeTe/ZnS quantum dots for microRNA-155 detection based on fluorescence resonance energy transfer technique by forming a network structure[J]. Analytical Methods, 2019, 11(32).
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