Oil Dispersible CdTe/CdSe/ZnS Quantum Dots
Alfa Chemistry offers high quality core/shell quantum dots with continuous overgrowth of CdSe and ZnS shell materials around CdTe core nanocrystals. The emission wavelength range is from 620 to 850 nm with up to 90% PL QY. Our CdTe/CdSe/ZnS quantum dots can be used for many applications, such as nanoelectronics and optoelectronics, or for further functionalization using various polymers and ligands. The passivation of ZnS shells with a rather wide band gap confines excitons within the CdTe/CdSe interface and isolates them from the solution environment, thus improving the stability of the nanostructures.
The photophysical properties of CdTe/CdSe/ZnS core/shell/shell NCs emitted at 820 nm were investigated by Gao et al. using various spectroscopic tools. By measuring the temperature-dependent photoluminescence (PL) spectra, the bandgap coefficient of variation of CdTe/CdSe/ZnS core/shell/shell NCs was determined to be -1.01×10-5 K-1, while the exciton-phonon and exciton longitudinal optical (LO) phonon coupling strengths and LO phonon energies were 120 μeV/K and 26 and 77 meV, respectively. Their biocompatibility and NIR-III excitation has been demonstrated for in vitro bioimaging. The high exciton stability and robust multiphoton excitation PL brightness of CdTe/CdSe/ZnS core/shell/shell NCs ensure that these NIR-I emitting CdTe/CdSe/ZnS NCs will be very promising for applications in various optoelectronic devices and deep tissue bioimaging.
Fig.1 Physical properties of CdTe/CdS/ZnS core/shell/shell nanocrystals. (Gao et al., 2020)
Su et al. prepared bilayer core-shell quantum dots CdTe@CdSe@ZnS suitable for targeted cancer photothermal therapy, which belongs to the field of photothermal therapy and core-shell quantum dots. The described bilayer-shell core-shell quantum dots CdTe@CdSe@ZnS are based on CdTe nanocrystals as the core, CdSe intermediate shell layer as the outer layer of the CdTe core, and ZnS shell as the outer layer of the CdSe intermediate shell layer, i.e., the final product is a CdTe@CdSe@ZnS bilayer-shell core-shell structure. Preparation of inert ZnS, wrapped with CdTe@CdSe monolayer core-shell quantum dots. The bilayer shell core-shell quantum dots CdTe@CdSe@ZnS were prepared to reduce the toxicity caused by the heavy metal Cd and are suitable for biomedical use.
Hai et al. present new results on biosensors made from surface-modified CdSe/ZnSe/ZnS quantum dots with acetylcholinesterase (AChE) for the optical detection of pesticides. In the biosensor, QD-streptavidin-antibiotin-acetylcholinesterase was used as a substrate for pesticide detection. The pesticides used in this work were methyl parathion (PM) and acetamiprid. Acetylthiocholine (ATCh) was used as an indicator of AChE enzyme activity. Alternatively, organophosphorus (OP) pesticides are inhibitors of the AChE enzyme. Mixtures of pesticides and ATCh are used as targets for pesticide specifications and can be detected by changes in the PL intensity of the QDs biosensor for pesticides ranging from 0.05 ppb to 10 ppb.
Alfa Chemistry can provide a variety of complex and customized core-shell fluorescent quantum dot products. Our products involve a variety of fluorescent quantum dot products. Alfa Chemistry provides products with high fluorescence quantum yield, stable quality and relatively low price. Our products are constantly updated. If the product you need is not in our catalog, please feel free to contact us, we provide relevant custom services.
- Gao Y., et al. Photophysical properties of water-soluble CdTe/CdSe/ZnS core/shell/shell nanocrystals emitting at 820 nm[J]. The Journal of Physical Chemistry C, 2020, 124(14): 7994-7999.
- Zhang, W. , et al. Design and synthesis of highly luminescent near-infrared-emitting water-soluble CdTe/CdSe/ZnS core/shell/shell quantum dots.[J]. Cheminform, 2009, 40(51):9723-31.
- Su X. Q., et al. A dual core-shell quantum dot CdTe@CdSe@ZnS for targeted cancer photothermal therapy. CN112724960A.2021.
- Hai, Nguyen Ngoc, et al. Detection of the pesticide by functionalised quantum dots as fluorescence–based biosensor[J]. International journal of nanotechnology, 2013, 10(3-4): 137-145.
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