Oil Dispersible CdSe Quantum Dots
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Product Description
Alfa Chemistry provides quantum dots with unique advantages such as high fluorescence quantum yield, tunable fluorescence emission spectra, good biocompatibility, stable optical properties, and narrow and symmetrical emission bands. Our fluorescent quantum dots can be surface modified to obtain functional groups covering carboxyl and amino groups and coupled with biological macromolecules such as nucleic acids and proteins by the action of cross-linking agents. They can also be used as biological and chemical probes for basic research such as cell localization and imaging, chemical detection, and clinical diagnosis.
Alfa Chemistry offers high quality oil dispersible CdSe quantum dot products. It is a core-shell fluorescent nanomaterial with CdSe as the core and a hydrophobic ligand covering the surface. The average quantum yield is 60%. We can customize our products for any wavelength from 480 nm to 640 nm.
Applications
Fluorescence Sensors
Yang et al. introduced surface molecularly imprinted polymers (SMIP) and microfluidics to monitor organophosphorus pesticide (OPs) residues in ecosystems to select a simple and sensitive fluorescent sensor for rapid detection of dimethoate. Yang et al. used green synthesized oil-soluble CdSe quantum dots (QDs) as fluorescent materials based on static burst and photo-induced electron transfer mechanism for the selective detection of lewisite. Among many paper materials, glass fiber paper is used as a novel substrate for paper chips due to its low primary fluorescence and better binding performance with CdSe quantum dots. The interactions between several functional monomers and lego molecules were investigated and theoretically simulated using software during molecular imprinting to improve the selectivity of the sensor. The results showed that the detection platform could effectively detect lego within 10 min with a detection range of 0.45-80 μmol/L and a detection limit of 0.13 μmol/L.
Fluorescent Nanomarkers
Markers are often used to detect fraud and adulteration in fuels and to track products in the distribution chain. Do Nascimento et al. tested the use of CdSe semiconductor fluorescent nanocrystals, known as quantum dots, as a new class of fuel markers. Quantum dots display bright fluorescence, and they can be excited by light sources covering a wide spectral range, from the ultraviolet to the near-infrared region. This class of markers has great advantages over conventional markers, such as high detection potential, fluorescence emission at multiple color wavelengths, high photostability, and easy preparation procedures. In this work, the authors prepared CdSe quantum dots by colloid-controlled growth in organic media for the evaluation of diesel fuel. The detection method is by electron absorption or fluorescence spectroscopy. These nanomarkers can be detected in diesel fuel down to 1 mg/kg.
Figure 1. CdSe quantum dots as fluorescent nanotags for diesel fuel. (Do Nascimento, 2018)
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References
- Yang, X. Rapid Detection of Dimethoate in Soybean Samples by Microfluidic Paper Chips Based on Oil-Soluble CdSe Quantum Dots[J]. Foods, 2021, 10.
- Do Nascimento, Aquiles Silva , et al. CdSe quantum dots as fluorescent nanomarkers for diesel oil[J]. Fuel, 2018, 239(MAR.1):1055-1060.
* It should be noted that our service is only used for research, not for clinical use.
