Water Dispersible ZnCdS/ZnS Quantum Dots
Product Description
Alfa Chemistry offers water dispersible ZnCdS/ZnS core-shell quantum dots, which are widely used in bioimaging and optoelectronic devices due to their uniform particle size, broad absorption spectrum, narrow and symmetric emission spectrum, high fluorescence intensity and stability. We can provide emission range from 410 nm to 470 nm, and you can also customize products to us according to your needs.
Applications
Fluorescent Sensors
Wang et al. established a novel film consisting of ZnCdS/ZnS quantum dots (QDs) and g-C3N4 nanosheets conjugated to carboxymethyl chitosan (CMCS) chains via weak bonds. The Mn2+ in contact with the composite film forces a conformational change in the chitosan, leading to the intermolecular complex R-COO-(Mn2+)-NH2-R, which enhances the fluorescence. Based on the fluorescence resonance energy transfer mechanism, the film was developed for the determination of trace Mn2+ by the enhancement effect of the film. The sensor exhibited good linearity for Mn2+ under certain conditions. The film was successfully used for the determination of Mn2+ in real water samples with recoveries in the range of 90%-107%.
Fig.1 The possible mechanism of the g-C3N4 nanosheets /CMCS/ZnCdS/ZnS QDs film sensing manganese ion. (Wang et al., 2020)
Electrochemiluminescence (ECL) Immunosensor
Sun et al. designed a label-free electrochemiluminescence (ECL) immunosensor based on ZnCdS@ZnS quantum dots (QDs) for the sensitive determination of aflatoxin B1 (AFB1). The Nafion solution assembled abundant QDs on the surface of an Au electrode as an ECL signal probe with a specially coupled anti-AFB1 antibody as a capture element. Since the reduction reaction between S2O82- in the electrolyte and the QDs on the electrode leads to ECL emission, the reduced ECL signal generated by the target AFB1 in the sample was recorded for quantification. Tests with lotus seed samples confirmed the satisfactory selectivity, stability and reproducibility of the developed ECL immunosensor for the rapid, efficient and sensitive detection of trace amounts of AFB1 in complex matrices.
Fig.2 (A) Fabrication and (B) detection principle of the proposed QDs-based ECL immunosensor for detection of AFB1. (Sun et al., 2020)
White Light-emitting Devices (WLEDs)
In the study of white light-emitting devices (WLEDs), Wang et al. introduced blue-emitting ZnCdS/ZnS NCs with high quantum yield and stability for WLEDs along with yellow emission of CsPb(Br/I)3 perovskite NCs. WLEDs consist of ITO/ZnO/PEI/ZnCdS/ZnS NCs/CsPb(Br/I)3 NCs/TCTA/MoO3/Au composition. This design avoids the ion exchange between different perovskite NCs and achieves white light emission by simple fabrication. As a result, a white light coordinate of (0.34, 0.34) and an associated color temperature of 5153 K were achieved.
Fig.3 (a) Device structure, (b) corresponding energy level diagram, (c) absorption and PL spectra of ZnCdS/ZnS/CsPb(Br1.65I1.35) heterojunction, (d) time-resolved PL decays for pure ZnCdS/ZnS and ZnCdS/ZnS/CsPb(Br1.65I1.35) NC films under the excitation of 375 nm. (Wang et al., 2019)
Alfa Chemistry can provide a variety of complex and customized fluorescent quantum dot products. Our products involve perovskites precursors, perovskites quantum dots, quantum dot kit, single layer quantum dots, upconverting nanoparticles and other fluorescent quantum dots. 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
- Wang, S. , et al. Selective sensing of Mn2+ based on ZnCdS/ZnS QD/carboxymethyl chitosan/g-C3N4 nanosheet nanocomposite film by the conformational regulation of polymer chain[J]. Applied Surface Science, 2020, 530:147255.
- Sun, C. , et al. Development of a ZnCdS@ZnS quantum dots–based label-free electrochemiluminescence immunosensor for sensitive determination of aflatoxin B1 in lotus seed[J]. Microchimica Acta, 2020, 187(4).
- Wang, C. , et al. White light-emitting devices based on ZnCdS/ZnS and perovskite nanocrystal heterojunction[J]. Nanotechnology, 2019, 30(46):465201-.
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