CdSe/ZnS (core/shell) Quantum Dots Powder
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Product Description
CdSe/ZnS (core/shell) quantum dot powder, a highly luminescent semiconductor nanocrystal with hydrophobic coating of hydrophobic organic molecules. Freely soluble in toluene, chloroform, tetrahydrofuran, pyridine and so on, ZnS shell thickness-approximately 0.6 nm. Alfa Chemistry offers CdSe/ZnS core-shell quantum dots powder in wavelengths from 530 nm to 650 nm, we can also customize the right product for your project.
Applications
Fluorescent Probes
Kapambwe et al. investigated the potential use of mycolic acid (MA)-coupled cadmium-based quantum dots (QDs) as fluorescent probes for anti-MA antibodies that can be used as biomarkers for tuberculosis (TB). Water-soluble CdSe/ZnS quantum dots are covalently coupled to MA via an amide bond to form a water-soluble fluorescent probe: MA-CdSe/ZnS QD. MA-CdSe/ZnS quantum dots display a broad absorption band and coupling, which can be detected by The presence of amide bonds in the Fourier Transform Infrared (FTIR) spectrum is confirmed, resulting in a fluorescent blue shift. The visual paper-based lateral flow of MA-CdSe/ZnS quantum dots was achieved on a nitrocellulose membrane strip using both water and membrane confinement solution eluent.
Fig.1 Schematic diagram illustrating the synthesis of water-soluble core/shell CdSe/ZnS QDs capped with l-cysteine. (Kapambwe et al, 2021)
Sensors
Liu et al. constructed a novel photosensor for highly selective and sensitive detection of pyrroline (PRL) in milk powder by anchoring a molecularly imprinted polymer (MIP) on the surface of a metal organic framework (MOF) and CdSe/ZnS quantum dots (QD). Molecular blotting ensured high selectivity, and sensitivity was improved by dual signal amplification using CdSe/ZnS QDs nanocrystals as the fluorescent element and MOF as the blotting substrate. Quantum dots are introduced as tentacles in the molecularly imprinted sensor to sense the bonding interactions between the MIP and the target molecule and convert them into fluorescent signals. The opto-sensor had a high fluorescence quantum yield because of the use of hydrophobic CdSe/ZnS QDs and the reverse micro-emulsion. Under optimized conditions, the fluorescence intensity of the opto-sensor was linear with increasing PRL concentration over the range 5×10-6~1×10-3 mol·L-1, with a detection limit of 3.9×10-6 mol·L-1. Recoveries of 90-110% were achieved in direct selective detection of PRL in milk powders.
Fig. 2 Schematic illustration of the preparation of molecularly imprinted PRL sensor based on MOFs and QDs. (Liu et al, 2018)
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References
- Kapambwe P., et al. Synthesis and characterisation of quantum dots coupled to mycolic acids as a water-soluble fluorescent probe for potential lateral flow detection of antibodies and diagnosis of tuberculosis. Luminescence, 2021.
- Liu, H., et al. Sensitive detection of pyrraline with a molecularly imprinted sensor based on metal-organic frameworks and quantum dots. Sensors & Actuators B Chemical (2018).
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