Water Soluble CdS Quantum Dots
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Product Introduction
Water-soluble CdS quantum dots have the characteristics of uniform size and dispersion, low cost, and high sensitivity, and show broad application prospects in the field of fluorescence detection. Alfa Chemistry provides customers with CdS wavelengths ranging from 540 nm to 598 nm, at the same time, you can also customize related quantum dot products.
Applications
Ionic Probes
Chen et al. synthesized water-soluble luminescent CdS quantum dots (QDs) capped by polyphosphate, L-cysteine and thioglycerol in aqueous solution. It was found that these ligands have a profound effect on the luminescent response of CdS QDs to physiologically important metal cations. The polyphosphate-capped CdS QDs were sensitive to almost all monovalent and divalent cations and showed no ion selectivity. To demonstrate the detection capability of these new ion probes, L-cysteine and thioglycerol capped CdS QDs were used to detect zinc and copper ions in physiological buffer samples. The enhanced emission of zinc(II) to QDs is attributed to the activation of the surface state, while the effective reduction of copper(II) to copper(I) may explain the reduced emission of thioglycerol-capped CdS QDs when charged with copper ions. Unlike organic fluorescent dyes, thioglycerol-capped luminescent CdS QDs can distinguish between copper and zinc ions and are therefore suitable for the analysis of copper ions in biological samples in the presence of physiological concentrations of zinc ions.
Heavy Metal Detection
Cadmium sulfide (CdS) quantum dots are the most important II-IV semiconductors with a narrow band gap (2.42 eV), quantum confinement, and large surface area. Their excellent electrochemical, optical and fluorescence properties enable their effective use in pharmacological analysis and elemental detection. A simple one-step preparation method for the synthesis of water-soluble CdS quantum dots was reported by Wang et al. The potato extract contained various organic groups such as hydroxyl, carboxyl, carbonyl and sulfhydryl groups, which resulted in excellent water dispersibility of the prepared samples. In addition, the starch in the potato extract provided a stable environment for the synthesis of CdS quantum dots, which were evaluated as fluorescent detectors for silver ions.
Fig.1 Schematic diagram of water-soluble CdS quantum dots prepared quickly. (Wang, 2021)
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References
- Wang, S. , et al. One-Step Synthesis of Water-Soluble CdS Quantum Dots for Silver-Ion Detection[J]. ACS Omega, 2021.
- Chen, Y. , and Z. Rosenzweig. Luminescent CdS quantum dots as selective ion probes.[J]. Analytical Chemistry, 2002, 74(19):5132-5138.
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