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    Nano Au colloids are
    stable suspensions of gold nanoparticles (Au nanoparticles) in a liquid, typically water, which exhibit unique optical, electronic, and chemical properties. Their color can vary from wine red to blue-purple depending on particle size and shape, and they are used in a wide range of applications, including biomedical imaging, drug delivery, biosensors, and catalysis. 
    Properties and characteristics 
    • Size and shape: The term "nano" refers to the nanoparticles' size, which is typically on the nanometer scale. Particle shape also influences properties, with spherical particles and nanorods yielding different optical characteristics.
    • Color: The size and shape of the nanoparticles affect how they scatter light. Spherical particles smaller than 100 nm appear wine red, while larger spherical particles or nanorods may appear blue-purple.
    • Biocompatibility: Colloidal gold is considered non-toxic to human cells, making it suitable for medical applications like drug delivery and bioimaging.
    • Stability: Nano Au colloids are stable suspensions, meaning the nanoparticles do not easily settle out of the liquid. 
    Key applications 
    • Biomedicine: Used in immunolabeling, drug delivery, and as biosensors due to their ability to easily attach to biomolecules like proteins and antibodies.
    • Catalysis: The unique surface properties of gold nanoparticles make them useful as catalysts in various chemical reactions.
    • Electronics: Employed in the development of new electronic devices and materials.
    • Diagnostics: Used in rapid tests, such as those for disease detection and food safety, because of their distinct optical properties and ease of conjugation to antibodies.
    • Microscopy: Used as a contrast agent in electron microscopy. 
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    • Colloidal gold - Wikipedia
      Colloidal gold is a sol or colloidal suspension of nanoparticles of gold in a fluid, usually water. The colloid is coloured usuall...
      Wikipedia
    • Colloidal Gold (Au) - Hongwu International Group Ltd
      * Nano gold colloids with good stability. Nano gold colloids(hwnanomaterial) have good stability, small size effect, surface effec...
      Hongwu International Group Ltd
    • Colloidal Gold Nanoparticles: Uses & Benefits - Torskal
      Jun 17, 2025 — When compared to other metal nanoparticles, colloidal gold is not even a little toxic to human cells which makes it sa...
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    Wikipedia
    https://en.wikipedia.org › wiki › Colloidal_gold
    Colloidal gold is a sol or colloidal suspension of nanoparticles of gold in a fluid, usually water. The colloid is coloured usually either wine red or ...See more

    Parameters for Fabricating Nano-Au Colloids through the ...


    National Institutes of Health (.gov)
    https://pmc.ncbi.nlm.nih.gov › articles › PMC5485780
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    https://pmc.ncbi.nlm.nih.gov › articles › PMC5485780
    by KH Tseng · 2017 · Cited by 27 — The nano-Au colloid prepared at a TON–TOFF of 10–10 µs had the highest absorbance and concentration, whereas that prepared at a TON–TOFF of 100–100 µs had the ...See more

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    • Scholarly articles for Nano AU colloids

    Laser synthesis of Au/Ag colloidal nano-alloys: Optical … - ‎Compagnini - Cited by 107
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