Product Advantages: Small half-peak width of emission spectrum, high luminous efficiency, low cadmium content, high stability.
Product Applications: Solar cells, optoelectronic devices, biofluorescent markers, imaging reagents, etc.
Storage Conditions: Sealed, avoid light, and keep at 4°C.
Product Description
Oil-soluble CdSe/ZnS quantum dots (QDs) produced by Alfa Chemistry are nanoscale semiconductor particles with unique optical and electronic properties. These QDs are composed of a cadmium selenide (CdSe) core and a zinc sulfide (ZnS) shell, and the surface group is oleic acid. Unlike water-soluble QDs, oil-soluble CdSe/ZnS QDs can be dispersed and stabilized in organic solvents and oils.
Product Parameters
| Catalog Number | PL Emission | FWHM | Surface Ligand | Quantum Yield | Solvent |
| GH-QD0001 | 480±10 nm | ≤25 nm | Oleic Acid | ≥80% | Toluene/Hexane/Octane |
| GH-QD0002 | 500±10 nm | ≤25 nm | Oleic Acid | ≥80% | Toluene/Hexane/Octane |
| GH-QD0003 | 520±10 nm | ≤26 nm | Oleic Acid | ≥90% | Toluene/Hexane/Octane |
| GH-QD0004 | 540±10 nm | ≤26 nm | Oleic Acid | ≥90% | Toluene/Hexane/Octane |
| GH-QD0005 | 560±10 nm | ≤28 nm | Oleic Acid | ≥80% | Toluene/Hexane/Octane |
| GH-QD0006 | 580±10 nm | ≤28 nm | Oleic Acid | ≥80% | Toluene/Hexane/Octane |
| GH-QD0007 | 600±10 nm | ≤28 nm | Oleic Acid | ≥90% | Toluene/Hexane/Octane |
| GH-QD0008 | 620±10 nm | ≤28 nm | Oleic Acid | ≥90% | Toluene/Hexane/Octane |
| GH-QD0009 | 640±10 nm | ≤28 nm | Oleic Acid | ≥80% | Toluene/Hexane/Octane |
| GH-QD0010 | 660±10 nm | ≤28 nm | Oleic Acid | ≥80% | Toluene/Hexane/Octane |
*If you can't find the needed QDs in the table, please send us an inquiry.
Alfa Chemistry always puts product quality in the first place. Our oil-soluble CdSe/ZnS QDs are rigorously tested to meet the highest industry standards. In addition, we know that each project is unique. This is why our products have a variety of specifications to choose from, and you can customize the characteristics of these QDs according to your specific requirements. If you have any need, please contact us immediately. We look forward to establishing a close cooperative relationship with you.
Related Products
Oil-soluble CdSe/ZnS QDs for the Preparation of CTAB-modified CdSe/ZnS QDs
Chen, Cheng, et al. The Journal of Physical Chemistry C 112.48 (2008): 18904-18910.
The CTAB-modified CdSe/ZnS QDs (CTAB-QDs) were synthesized following these steps:
1) Purification of Oil-soluble CdSe/ZnS QDs
Start by centrifuging 0.5 mL of oil-soluble CdSe/ZnS QDs at 12,000 rpm for 5 minutes to remove any precipitates. Then, mix the QDs with 1.5 mL of ethanol and centrifuge again at 12,000 rpm for 5 minutes to eliminate excess TOPO ligands on the QDs' surface. Discard the supernatant after each centrifugation step.
2) CTAB Modification Process
Dissolve the resulting QD precipitate in 1.0 mL of chloroform containing approximately 1.5 mg of CTAB. Transfer the solution into a 5 mL beaker and heat it to 60°C with constant stirring to allow the chloroform to evaporate gradually. Once the chloroform has fully volatilized, add 1.0 mL of chloroform to the beaker and repeat this procedure three times.
3) Final Purification and Collection
Add pure water to the beaker and centrifuge the solution at 12,000 rpm for 5 minutes to remove any remaining precipitate. The final CTAB-modified CdSe/ZnS QDs are then ready for use.
This process results in the successful modification of oil-soluble CdSe/ZnS quantum dots with CTAB, suitable for various applications requiring enhanced stability and solubility in aqueous environments.
Construction of QD-Labeled DNA Probes Using Oil-soluble CdSe/ZnS QDs
Wu, Sheng-Mei, et al. ChemPhysChem 7.5 (2006): 1062-1067.
In this study, oil-soluble core–shell CdSe/ZnS quantum dots (QDs) with a maximum emission wavelength of 589 nm were utilized for the construction of QD-labeled DNA probes. Water solubilization of QDs is crucial for their biological applications, as oil-soluble QDs are incompatible with biological systems. The QDs are coated with a protective layer of trioctylphosphine oxide (TOPO), which must be removed to facilitate the formation of water-soluble, MAA-coated QDs (MAA-QDs).
The biofunctionalization of QDs is essential for creating biotargeting probes, which is the key to achieving biological specificity. In this context, "QDs" refers to the core-shell CdSe/ZnS QDs unless otherwise specified.
Procedure:
1) Preparation of Naked QDs
The TOPO and other oil-soluble molecules from the QD surface were washed off with ethanol, resulting in naked QDs.
2) Coating with MAA for Water Solubility
These naked QDs were then coated with MAA to make them water-soluble, enabling their use in biological environments.
3) QD-Labeled DNA Probe Construction
QD-labeled DNA probes were prepared by displacing a portion of the MAA molecules on the QD surface with thiol-modified single-stranded DNA (thiol-ssDNA) complementary to the plasmid pUC18. This process enables the functionalization of the QDs with specific DNA sequences.
All modification steps were carried out under light conditions to ensure the stability and functionality of the QDs.
This approach results in the successful creation of QD-labeled DNA probes, which are valuable tools for biological and diagnostic applications, such as biosensing and molecular imaging.
Oil-soluble CdSe/ZnS QDs-based "Off–On" Fluorescent Probe for Biological Detection of Zinc Ions
Xu, Hu, et al. Analyst 138.7 (2013): 2181-2191.
This study demonstrates the design and preparation of a quantum dot (QD)-based fluorescent probe for the selective detection of Zn2+ in biological media. The QD probe, modified with two dithiocarbamate (DTC) derivatives as co-capping ligands, exhibits a distinctive "off–on" photoluminescence (PL) response for zinc ions. The oil-soluble CdSe/ZnS core/shell QDs are transformed into the final probe via a ligand exchange process.
Synthesis and Sensing Protocol
The ligands, di-2-picolylamine-dithiolcarbamate (DPA-DTC) and proline-dithiolcarbamate (P-DTC), are first synthesized by reacting DPA/P with carbon disulfide (CS2). These ligands are then used to exchange the original oil-soluble ligands, resulting in water-soluble QDs. The final product, DPA-DTC/P-DTC co-capped CdSe/ZnS QDs (denoted as DPA-P-DTC-QDs), shows excellent water solubility and biocompatibility.
In the absence of Zn2+, the DPA-P-DTC-QDs exhibit weak PL due to charge separation from hole transfer, which significantly suppresses electron-hole recombination. In this state, the DPA-DTC ligand acts as a hole acceptor. Upon the introduction of Zn2+ ions, the quenched PL is gradually restored, with the recovered PL intensity correlating with the Zn2+ concentration. This allows for the quantitative detection of Zn2+ ions.
The DPA-P-DTC-QDs probe demonstrates high selectivity for Zn2+ and has been successfully used for detecting zinc ions in simulated biological fluids.
This approach offers a sensitive and selective method for Zn2+ detection, making it a promising tool for biological and environmental monitoring.
