Perovskite Quantum Dots Supplier - Alfa Chemistry

ZnS Quantum Dots


Product Description

ZnS is a group IIB semiconductor, which belongs to the Zn class of quantum dots. Compared with PbSe, CdTe and other quantum dots containing lead and cadmium, ZnS quantum dots are abundant in raw materials, economical and low toxicity, and non-polluting to the environment, and have important applications in many fields. Alfa Chemistry offers ZnS quantum dots at wavelengths of 610-690 nm with 99.9% purity and 50-80% quantum yield, and of course, you can customize the dots to your needs with specific wavelengths, quantum yields, and specific solvents.



Using carboxymethyl cellulose (CMC) as a pH-sensitive biopolymer, ZnS fluorescent quantum dots (ZnS-QDs) were synthesized and stabilized by Caires et al. under different pH conditions (acidic, neutral and basic) and chemical ratios of precursors (Zn2+, S2-). The optical properties of these nanoconjugates (ZnS@CMC) were characterized by UV-Vis and photoluminescence spectroscopy. Morphological characteristics and physicochemical properties were evaluated by TEM, spectroscopy, and dynamic light scattering (DLS) analysis.The in vitro cytocompatibility of ZnS@CMC was assessed by MTT assay using normal and malignant glioma cells. In vitro cell viability results indicated that ZnS@CMC nanofilms were not cytotoxic to both cell types. Importantly, these ZnS@CMC nanoconjugates were used as active fluorescent nanoprobes for bioimaging of malignant glioma cells, demonstrating their high potential for application in cancer nanomedicine.

UV-Vis, PL spectra and confocal microscopy imaging of ZnSCMC.Fig.1 UV-Vis, PL spectra and confocal microscopy imaging of ZnS@CMC. (Caires, 2020)


The photocatalytic degradation of methyl orange dye using ZnS/ZnCr2O4 nanohybrid samples was reported by Palanisamy et al. These samples were prepared by a simple precipitation process and characterized to study their crystallinity, morphology, functional groups, photophysical properties, elemental composition, and cartography. The amino acid capped ZnS/ZnCr2O4 nanohybrids showed stronger photocatalytic properties in the photodegradation of azo dyes compared to bare ZnS QDs and ZnCr2O4 nanoparticles. The enhanced performance could be attributed to the formation of an interface between ZnS QDs and ZnCr2O4 nanoparticles. The methionine-capped ZnS/ZnCr2O4 nanohybrids offer new hope for the development of efficient and commercially available photocatalysts with improved efficiency.

Mechanism of azo dye degradation by ZnS/ZnCr2O4 photocatalyst.Fig.2 Mechanism of azo dye degradation by ZnS/ZnCr2O4 photocatalyst. (Palanisamy, 2020)

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  1. Caires, A. J. , et al. Green synthesis of ZnS quantum dot/biopolymer photoluminescent nanoprobes for bioimaging brain cancer cells. Materials Chemistry and Physics, 2020, 244, 122716.
  2. Palanisamy, G. , et al. Spinel oxide ZnCr2O4 incorporated with ZnS quantum dots for application on visible light driven photocatalyst Azo dye degradation. Colloids and Surfaces A Physicochemical and Engineering Aspects, 2020, 590, 124505.
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