Product Description
CdS quantum dots are an important nanomaterial with a very large specific surface area and many surface defects, and the optical properties of CdS quantum dots are poor, CdS quantum dots exhibit obvious quantum size effect and blue shift of absorption band. In order to improve the stability of luminescence, a wide bandgap semiconductor particle ZnS can be used as a shell to wrap the narrow bandgap semiconductor particle CdS. Alfa Chemistry offers core-shell type CdS/ZnS quantum dots, including CdS/ZnS core-shell type quantum dots solid and water-soluble CdS/ZnS quantum dots. With high fluorescence quantum yields and low cellular toxicity, CdS/ZnS quantum dots can be effectively expanded for applications in biomedical engineering and, at the same time, have great potential for applications in light-emitting diodes, solar cells, and nonlinear optical devices.
Applications
Gene Expression
With the development of agriculture and industry, various materials such as nanomaterials, heavy metal materials, and the accumulation of other biomass materials have obvious physiological and toxicological effects on the growth, development and reproduction of living organisms. Zhang et al. investigated the biosafety of CdS/ZnS quantum dots from the growth and development to the genetic level using Cryptomeria hidrophila as a research object. It was found that the exposure of CdS/ZnS quantum dots not only inhibited the biological behaviors such as body length, head swing and body bending, but also affected the expression of nematode cytotoxicity-related genes, stress-related genes and cell growth and development-related genes. When the exposure concentration of CdS/ZnS quantum dots was 3.33 nmol/L, the nematode body length, head oscillation and body bending decreased from (0.64±0.072) mm, (55.94±7.17) times/min and (9.95±2.42) times/20 s in the blank group to (0.48±0.099) mm, (15.83±6.76) times/min and (7.72±1.7) times/min, respectively. min and (7.72±1.12) times/20 s; while the expression of GST-1, daf-21, and HSP-16.4 increased 15.33, 19.51, and 35.01-fold, respectively.
Photocatalysis
Su et al. prepared CdS/ZnS core-shell microspheres using a simple two-step method combining ultrasonic spray pyrolysis and chemical bath deposition. The photocatalytic performance of the core-shell structure was superior to that of Cd or ZnS spherical particles. CdS/ZnS photocatalysts loaded with different amounts of ZnS as the shell layer were prepared by adjusting the concentrations of Zn and S precursors during the synthesis process. The optical properties and photocatalytic hydrogen production activity of the catalysts were examined, and the amount of loaded ZnS was optimized. By thermal annealing and hydrothermal sulfidation of the core-shell structure, the crystal defects and surface states were eliminated, and the photocatalytic activity and stability of the material were improved.
Fig. 1 SEM (a), TEM (b) and HRTEM images (g) of CdS/ZnS core-shell spherical particle and corresponding EDS elemental mapping of Cd (c), Zn and Cd (d), S (e), and Zn (f). (Su, 2017)
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References
- Zhang, C., et al. Toxicity of CdS/ZnS Quantum Dots in vivo:a Caenorhabditis elegans Study[J]. Acta Laser Biology Sinica, 2019.
- Su, J., et al. Surface treatment effect on the photocatalytic hydrogen generation of CdS/ZnS core-shell microstructures[J]. Chinese Journal of Catalysis, 2017, 38(3):489-497.
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