Water Soluble Quantum Dots (Zinc Selenide /Zinc Sulphide-PEG-NH₂ Quantum Dots)

Water Soluble Quantum Dots (Zinc Selenide /Zinc Sulphide-PEG-NH₂ Quantum Dots)

Product: Water Soluble Quantum Dots (ZnSe/ZnS-PEG-NH₂ Qds)

We provide high quality Water Soluble Quantum Dots (ZnSe/ZnS-PEG-NH₂ Qds-410nm)

Water Soluble Quantum Dots

Zinc Selenide /Zinc Sulphide-PEG-NH₂ Quantum Dots – 410±10nm

Product Name ZnSe/ZnS-PEG-NH₂ Quantum Dots
Stock No. NS6130-12-000186
CAS Number 1315-09-9 Confirm
Purity 99.9%  Confirm
Composition ZnSe/ZnS Confirm
Emission Peak 410±10nm Confirm
Surface Group PEG-NH₂ Confirm
Solvent Water Confirm
Application Bio-Conjugation with Bio-Molecules
Main Inspect Verifier Manager QC

Experts Review:

Dr. Ms. Kamiko Chang, Ph.D(University of Science and Technology Beijing, China)
QDs have particularly interesting fluorescence properties, the emission wavelength depends strongly on the particle size and the nature of the corresponding phase, it is possible then to excite them in a wide wavelengths range below the wavelength of fluorescence. Their fluorescence performance exceeds those of conventional organic dyes. In addition to that, the quantum yield fluorescence and emission wavelength are greatly influenced by the particle size, which is directly related to their method of preparation, the nature and proportion of the doping element.

images (12) Dr. Nicholaos G. Demas (Newcastle University School Of Machanical & Systems Engg. UK)
Structuring agents (ligands) as organic molecules play a key role in the stability of the nanocrystals, they surround the surface of the nanocrystals by steric repulsion between particles, allowing them suspended in a suitable solvent, a lack of ligands leads to particle aggregation. The affinity of ligands with particle surface depends on the interaction of their functional groups and their chain length with the surface.

58496396Dr. Bruce Perrault, Ph.D (Georgia Institute of Technology (Georgia Tech), USA)
The ligands are not linked to the surface, but they are in constant exchange between the free and the bound forms which allows the particles to grow during synthesis. In general, the ligands have growth control ability, several types of ligands can be used in the syntheses, and their relative affinity to the surface is the parameter which scientists use to modify the reactivity of different crystal faces to obtain particular sizes and shapes of nanocrystals. The ligands may also play a direct role in the reaction mechanism, leading to different crystal structures.

2536582Dr. Huojin Chan (University of Science and Technology of China, Hefei, Anhui, China)
Nevertheless, ligands have a capacity to burn off the ability of the nanocrystals surface, the dangling bonds due to surface atoms can create loads that cannot be compensated by neutral ligands. In addition, the ligands form an insulating layer that can be used to confine the charges in the nanocrystal and protect their fluorescence even without shell.

images (33)

Dr. Darren Chandler, Ph.D(Manchester Metropolitan University, U.K)
Surface modified Znse/Zns  quantu dots have cubic zinc blende structure. The enhancement of the luminescent ZnSe/Zns QD by doping the  main phase using various elements as metals, transition metals and halides can serve for imaging of the positive cells especially used for cancer identification cells and life cell imaging. The application was based on conjugated ZnS using folic acid to detect cancer in lung fibroblast cell.

water soluble quantum dots

Zinc Selenide/Zinc Sulphide-PEG-COOH Quantum Dots

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