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If you're in research, device development, or industrial applications, finding reliable sources for quantum dots for sale is critical. The quality, purity, consistency, and support from the supplier all matter just as much as the price. Below is a guide to trusted suppliers, what to look for, and a comparative view of pricing and offerings.

What to Look for in a Quantum Dots Supplier

Before exploring vendors, it’s useful to know what criteria make a supplier trustworthy:

1. Quality & Purity: High chemical purity and narrow size distribution are essential, especially for optoelectronic or biological applications.

2. Characterization Data & Certificates: Reliable vendors provide datasheets, TEM/SEM images, absorption/emission spectra, quantum yield, and setup conditions.

3. Surface Functionalization Options: The availability of ligand options (e.g. oleic acid, amine, carboxyl, PEG) helps for your integration needs.

4. Scalability & Custom Orders: For scale-up or special wavelengths, the ability to customize or supply bulk is a plus.

5. Shipping, Safety & Regulatory Compliance: Nanomaterials are regulated in many jurisdictions; the supplier should follow safe handling, labeling, and export regulations.

6. Reputation & References: Reviews, publications citing the supplier, or institutional trust matter.

Top Trusted Online Suppliers of Quantum Dots

Below are some reliable suppliers in the quantum dots marketplace:

1. NNCrystal (NN Labs / NNCrystal US)

They offer a range of quantum dots including InP/ZnS and CdSe/ZnS, and they support custom orders (wavelengths, solvents, etc.).
Example: High Efficiency InP/ZnS QDs listed at around USD 220.50 for certain grades.

2. Quantum Solutions (QDot™ line)

They market quantum dot products such as PbS, InAs, and perovskite QDs, with prices ranging from a few hundred USD up to thousands depending on material and functionality. 

3. PlasmaChem GmbH

They offer many quantum dot types (CdSe/ZnS, InP/ZnS, etc.), both hydrophobic and hydrophilic forms. Pricing for lab-scale quantities is in the tens to hundreds of euros.

4. MSE Supplies

They list PbS quantum dots (50 mg bottle) around USD 538.95 for certain emission ranges (e.g. ~850 nm) in organic solvents.

5. Alfa Chemistry (Perovskite / Core-Shell QDs)

They are known for supplying perovskite quantum dots and other specialty nanomaterials. Custom orders and variants are possible.

6. Sigma-Aldrich / Merck

A more standard chemicals supplier offering quantum dot products in well-characterized forms. You can filter by material, ligand, form (liquid / powder).

7. Nanorh / Nano Research Elements

A manufacturer and supplier that provides various emission-spectrum quantum dots and customizable opcions.

8. Ocean Nanotech

They specialize in functionalized/amine quantum dots suitable for biological conjugation, immunoassays, etc. E.g. 2 nmol of amine-terminated QDs ~ USD 279.

9. MKNano

They carry a catalog of quantum dots—CdSe, InP/ZnS, etc.—in solvent-based forms or powder. They emphasize high purity and heavy-metal-free options.

10. RayBiotech

RayBiotech provides quantum dots (450–645 nm ranges) for bio / flow cytometry applications.

Price Comparison & Typical Ranges

Here’s a rough breakdown of what you might expect when buying quantum dots online (lab / research scale):

* Prices exclude shipping, taxes, and any extra purification or custom work.

Note: As the quantity, purity, and functionalization increase, costs can rise steeply. Bulk orders often reduce per-unit cost, but only reliable suppliers should be trusted for large volumes.

Sample Products / Catalog References

Since physical products like books or display panels also show up in searches for “quantum dots”, here are some relevant items (though not “quantum dots for sale” in the nanomaterials sense):

A few highlights:

• Sigma‑Aldrich Graphene Quantum Dots – useful if you're investigating “graphene quantum dots” (carbon-based)

• Sigma‑Aldrich Perovskite Quantum Dots – perovskite QDs, often used in optoelectronic research

Note: These are not semiconductor core/shell QDs typically used in devices, but related materials sometimes relevant in broader QD research contexts.

Tips & Best Practices Before Buying

1. Start Small / Request Samples
   Before committing to bulk quantities, order a test sample to verify emission, stability, and compatibility.

2. Ask for Full Characterization
   Request absorption/emission spectra, TEM images, quantum yield, and distribution (size histogram).

3. Understand Ligand Chemistry
   The surface chemistry (ligands) affects solubility, dispersion medium (water vs organic), and functionalization. Be sure the supplier supports your usage.

4. Check Shipping / Customs Constraints
   Many countries have controls on nanomaterials, heavy metals, or hazardous goods. Understand import rules for your region.

5. Check Reproducibility & Lot-to-Lot Variation
   For high-precision applications, ensure that different lots from the supplier deliver consistent behavior.

6. Negotiate for Bulk / Academic Discounts
   Many suppliers offer lower prices for larger orders, academic institutions, or for recurring customers.

7. Verify Safety & SDS
   Ensure you receive a Safety Data Sheet (SDS) and handling guidelines from the supplier, especially for toxic or unstable QDs.

Conclusion

If you’re searching for quantum dots for sale, the landscape is diverse and prices vary widely. Trusted suppliers such as NNCrystal, Quantum Solutions, PlasmaChem, MSE Supplies, and Sigma-Aldrich are among those that combine quality, support, and established reputation. Always prioritize full characterization, sample testing, and compatibility with your needs over purely chasing low cost. With careful selection and due diligence, you can acquire quantum dots that meet your research or product goals.