Gold Nanoparticles AuNPs

NanoBrand offers gold nanoparticles (AuNPs), also known as colloidal gold or nano gold, with diameters from 5 to 200 nm. Their size and surface chemistry influence optical response, colloidal behavior, and biomolecule attachment, supporting applications in lateral flow assays, biosensing, imaging, and drug delivery research.

NanoBrand manufactures monodisperse AuNPs in Canada, in three product lines.

Ordering details:

Every NanoBrand lot ships with its own characterization data, measured on the specific batch you receive to confirm its stated particle size, optical properties, and quality specifications.

Standard lead time is 2 to 3 weeks. Custom diameters, concentrations and surface coatings are available on request, from research quantities to bulk manufacturing.

Universities receive a 10% discount on purchase orders, helping support academic research. Returning customers receive a 5% discount, applied automatically in the cart at checkout.

Choosing between the three product lines

Product line Surface Size Suited to
Spherical, Citrate Surface Citrate surface formed during synthesis, no added stabilizers 5 to 200nm Passive antibody adsorption, optical assays, imaging, method development, drug delivery and cancer therapy research
IVD-READY Citrate-coated or PEG5000-carboxylate, for passive adsorption or covalent EDC/NHS coupling 20-40-80-100nm Lateral flow assays and biosensors where the conjugate must stay stable
Gold Nanostars PVP or chitosane-coated 30-60-90nm SERS detection, imaging, photothermal therapy and drug delivery research, where a spiky surface and near-infrared absorption are needed

All three lines are dispersed in water, free of buffers and reactants.

Need a diameter, concentration or surface coating that is not in the catalogue? Request a custom specification.

Frequently Asked Questions

What types of gold nanoparticles does NanoBrand offer?

NanoBrand offers spherical gold nanoparticles (AuNPs), IVD-READY gold nanoparticles, and gold nanostars in a range of diameters and optical properties. Spherical AuNPs are widely used for research, antibody conjugation, biosensing, imaging, and lateral flow assay development. "IVD-READY" gold nanoparticles are designed for diagnostic assay workflows requiring consistent particle properties and lot-specific characterization. Gold nanostars have branched surfaces and tunable optical absorption, making them especially useful for plasmonic sensing, surface enhanced Raman scattering (SERS), imaging, and photothermal research.

Which gold nanoparticle size should I choose?

The right gold nanoparticle size depends on the application, conjugation chemistry, optical signal, and required migration or dispersion behaviour. Smaller spherical gold nanoparticles can be useful where fast, uniform migration and reduced steric crowding are important, while larger particles can provide stronger optical scattering and higher visible signal. For lateral flow assays and other IVD applications, the final choice should be confirmed by testing the full conjugate and membrane system. Gold nanostar performance depends on both overall diameter and branch geometry, which determine the localized surface plasmon resonance peak.

What are gold nanostars used for?

Gold nanostars are branched gold nanoparticles with sharp tips that create strong local electromagnetic fields and tunable localized surface plasmon resonance (LSPR). By controlling the core and branch geometry, their absorption peak can be tuned from the visible into the near-infrared range. This makes gold nanostars valuable for SERS detection, plasmonic biosensing, optical imaging, and near-infrared photothermal research. Their high optical response also makes them attractive for multifunctional imaging and theranostic platform development.

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