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    • Gold (Au) Nanopowder/Nanoparticles

    MK Nano offers high-purity gold nanoparticle products, available as a nanopowder or colloidal suspension. Our gold nanoparticles are made to be of the highest quality and have unique optical and electronic properties. This makes them perfect for advanced uses in bio-imaging, sensing, catalysis, and electronics.

    Gold Nanoparticles: Product Details

    Our gold nanoparticle solutions are designed to work better and last longer. These nanoparticles are more than simply tiny fragments of gold; they are complex materials that behave quite differently from their bulk counterparts, which opens up a whole new world of scientific possibilities.

    What are Gold Nanoparticles?

    Gold nanoparticles, or AuNPs, are tiny particles of gold that are between 1 and 100 nanometers (nm) in diameter. At this size, they possess remarkable characteristics, the most important of which is a phenomenon called Localized Surface Plasmon Resonance (LSPR). This gives them their bright, size-dependent color (usually red or purple) and makes them very helpful for imaging and diagnostics.

    Synthesis of Gold Nanoparticles

    The unique features of gold nanoparticles are significantly influenced by their synthesis method. We use a variety of established techniques to make particles with a particular size and shape, such as:

    • Citrate Reduction: The Turkevich method is a traditional way to use sodium citrate to break down a gold salt into stable, spherical nanoparticles.
    • Seed-Mediated Growth: a versatile technique that uses tiny "seed" particles to make bigger nanoparticles with particular shapes, such as nanorods or nanostars.
    • Biological Synthesis: A "green" technique that is good for the environment and employs plant or microbe extracts as reducing and capping agents.

    Properties of Gold Nanoparticle

    Gold nanoparticles exhibit distinct optical and physical behaviors based on their dimensions, geometry, and dispersion state.

    Size

    Smaller particles absorb more light (peak ~520 nm), larger particles scatter more and show red-shifting.

    Shape

    Spherical AuNPs show visible light plasmon peaks, while nanorods or nanostars extend into the near-infrared region.

    Aggregation

    Well-dispersed AuNPs are ruby red, while aggregation causes a color shift to purple/blue due to SPR coupling.

    Technical Specifications Of Gold Nanoparticles

    Property Specification
    SKU MKN-Au-090
    CAS Number 7440-57-5
    Formula Au
    Purity >99.99% (trace metals basis)
    Colour Reddish liquid suspension; dark brown/black nanopowder
    Appearance Nanopowder / Aqueous Dispersion
    Average Particle Size <90 nm (custom sizes available)
    Size 90 nm
    Morphology Predominantly Spherical
    Bulk Density Approx. 19.3 g/cm³ at 25°C
    Melting Point Approx. 1063 °C
    Boiling Point Approx. 2808 °C

    Gold Nanoparticles Applications

    Gold nanoparticles are very useful in many different disciplines since they can be used in a variety of ways. Their unique mix of biocompatibility, chemical stability, and plasmonic qualities promotes innovation in many fields. Some of the most important applications are:

    • Diagnostics: Used as the colorimetric agent in lateral flow assays (such as home pregnancy tests) and as labels in immunoblotting.
    • Biomedical Imaging: Serve as contrast agents in modalities such as CT scans and Photoacoustic Imaging.
    • Therapeutics: Modified to target cancer cells for photothermal treatment, which uses light to heat up and kill malignancies.
    • Sensing: They are the foundation for very sensitive biosensors that can detect proteins, DNA, and infections.
    • Catalysis: Work as very effective catalysts in a wide range of chemical processes, such as oxidation and cleaning up the environment.
    • Electronics: Investigated for usage in memory devices, flexible electronics, and conductive inks.

    Frequently Asked Questions About Gold Nanoparticles

    Q1. What factors affect the properties of gold nanoparticles?

    A: Size, shape, and aggregation strongly influence AuNPs’ optical absorption (SPR), chemical reactivity, and stability. Surface functionalization also affects biocompatibility and solubility.

    Q2. What is the shelf life of gold nanoparticles?

    A: Colloidal AuNPs typically have a shelf life of 6–12 months under ideal storage conditions. Dry nanopowders are more stable and can last longer if kept moisture-free.

    Q3. How to store gold nanoparticles?

    A: Store suspensions at 4–8 °C (do not freeze). Avoid exposure to strong light or extreme pH. Keep powders in airtight, desiccated conditions.

    Q4. Are gold nanoparticles sensitive to light?

    A: Yes, prolonged exposure to UV or direct sunlight may cause aggregation or altered stability. Always store in amber vials or light-protective containers.

    Q5. How to purify gold nanoparticles?

    A: Centrifugation, dialysis, and filtration are commonly used to remove unreacted precursors or surfactants.

    Q6. How to detect gold nanoparticles?

    A: Techniques such as UV-Vis spectroscopy (SPR absorption), electron microscopy (TEM/SEM), and Dynamic Light Scattering (DLS) are routinely used.

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