Oil Soluble CdS Quantum Dots
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Product Introduction
Oil soluble CdS quantum dots, surface wrapped by hydrophobic ligands fluorescent nanomaterials, can be customized for customers to produce different grams of products at any wavelength from 540 nm to 598 nm. The product has uniform particle size, broad absorption spectrum, narrow and symmetric emission spectrum, high and stable fluorescence intensity. It can be used in solar cells, light-emitting devices and biofluorescent labeling.
Applications
Photocatalysis
The CdS quantum dots were used in the catalysts by first surface modifying the QDs with polyvinylpyrrolidone (PVP) as a surfactant, and later encapsulating the various QDs into ZIF-8. To tune the growth rate of encapsulating the active species into the ZIF, an effective option is to use an agent similar to the imidazole ligand of the ZIF for encapsulating the active species. Thus, 2-mercaptoimidazole may be a suitable capping material for implementing the above strategy to encapsulate nanoparticles within ZIF-8. Herein, Ye et al. reported an effective strategy for in situ encapsulation of CdS QDs in nanocages of ZIF-8 by employing parallel capping agent 2-mercaptoimidazole and ligand-ZIF-8 to obtain different amounts of CdS QDs. complete molecular sieve effect of CdS QD@ZIF-8 composites prepared using the proposed strategy was also revealed. By using 2-mercaptoimidazole encapsulated CdS QDs into ZIF-8, photocatalytic and molecular sieving effects were exhibited when using molecular redox mediators of different sizes (e.g., methyl viologen (MV2+) and diquat (DQ2+)).
Fig.1 Schematic illustration of the ligand exchange process of oleic acid with 2-mercapto imidazole and encapsulation of exchanged CdS QDs into ZIF-8. (Ye, 2020)
Biosensor
As a type of semiconductor quantum dots, CdS QDs exhibit tunable emission wavelengths due to their versatility and tunable size, and are widely used as emitters for cathode ECLs. Yang et al. prepared water-soluble Ir nanorods (Ir NRs) with high luminescence efficiency by carboxylating Ir(py)3 with polystyrene-maleic anhydride (PSMA). Dual-signal nanoprobes (Ir NRs@CdS QDs) were further constructed by the combination of CdS QDs and Ir NRs, and acetylcholinesterase (AChE) and choline oxidase (ChOx) were immobilized as substrates for the development of ECL-ratio biosensors. The bifunctional H2O2 produced by the enzymatic reaction had opposite effects on the two ECL signals, i.e., enhanced the cathodic signal and quenched the anodic signal. In the absence of OPs, the occurrence of the enzymatic reaction and the in situ generation of H2O2 resulted in a "signal off" state for anodic Ir NRs and a "signal on" state for cathodic CdS QDs. In the presence of OPs, H2O2 production is prevented due to the inhibition of AChE activity by OPs, with an increase in anodic signal and a corresponding decrease in cathodic signal. The water-soluble Ir NRs greatly expand the application of Ir(III) complexes, and the integration of Ir NRs@CdS QDs and H2O2 provides a novel ratiometric ECL sensing platform for bioanalysis.
Fig.2 The schematic description of the construction and ECL response of biosensor. (Yang, 2021)
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References
- Ye, R. S., et al. Strategy for Encapsulation of CdS Quantum Dots into Zeolitic Imidazole Frameworks for Photocatalytic Activity[J]. Nanomaterials, 2020, 10(12):2498.
- Yang, G., et al. Ratiometric electrochemiluminescence biosensor based on Ir nanorods and CdS quantum dots for the detection of organophosphorus pesticides[J]. Sensors and Actuators B Chemical, 2021, 341:130008.
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