Oil Dispersible PbS Quantum Dots
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Product Description
Oil-soluble PbS quantum dot products, the surface is covered by hydrophobic ligands, the average quantum yield is 50%, should be stored away from direct sunlight, 4 degrees sealed in the dark, can be customized for customers to produce different grams of products at any wavelength from 850 nm to 1550 nm. The product has the characteristics of uniform particle size, broad absorption spectrum, narrow and symmetrical emission spectrum, high and stable fluorescence intensity, etc. It can be used in electronic communication, liquid crystal display, light-emitting diode, solar cell, biofluorescent labeling and other fields.
Commonly used solvents: toluene, chloroform, hexane, commonly used concentration: 25 mg/mL, and can be diluted directly with solvent before use according to your experimental needs. No special treatment is required, and the solution is recommended to be used within one week, as the emission peak will be shifted after one week.
About Oil-soluble PbS Quantum Dots
There are three main types of functionalized modifications of quantum dots as follows.
1. Surface ligand exchange, the use of water-soluble groups of ligands to replace the ligands on the surface of hydrophobic quantum dots.
2. Polymer wrapping, the hydrophobic part of the polymer molecules and the quantum dot surface of the long-chain alkanes through the van der Waals interaction between the formation of micelles and wrapped quantum dots.
3. Silica layer wrapping, generally using silane containing sulfhydryl groups to replace the hydrophobic ligands on the surface of the quantum dots.
Applications of Oil-soluble PbS Quantum Dots
PbS quantum dots (QD) are synthesized by a simple aqueous chemistry using L-methionine (Meth) as a capping agent. The synthesized methyl-terminated PbS quantum dots exhibit uniform size, strong fluorescence emission (maximum emission wavelength of 510 nm) and a quantum yield (QY) of 17.3%, as well as strong photostability and temporal stability. The resulting PbS QDs act as fluorescent probes for the selective detection of As(III) in aqueous media. When As(III) ions are added to the QDs solution, the fluorescence intensity is effectively quenched due to the strong interaction between As(III) and Meth forming an S and N bidentate chelate ring. Under optimal conditions, a linear relationship between the fluorescence burst and the As(III) concentration was observed in the range of 5-150 ppb, with a detection limit of 3.7 ppb. It is below the maximum permissible amount of As(III) ions in drinking water (10 ppb) allowed by the World Health Organization (WHO). The fluorescence method has good selectivity and high sensitivity, and can be applied to the rapid detection of As(III) in real water samples.
Fig.1 Aqueous synthesis of L- methionine capped PbS quantum dots for sensitive detection and quantification of arsenic (III). (Rahimi, 2021)
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Reference
- Rahimi F., et al. Aqueous synthesis of L-methionine capped PbS quantum dots for sensitive detection and quantification of arsenic (III). Journal of Photochemistry and Photobiology A Chemistry, 2021, 417(No.02):113361.
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