Au Nanoparticles

Gold nanoparticles, also known as gold nanoparticle colloids, are colloidal systems formed by dispersing gold nanoparticles in a solution. Common methods for preparing gold nanoparticle colloids include the sodium citrate reduction of chloroauric acid method, also called the seed growth method or electrochemical synthesis method. The color of gold nanoparticle colloids changes with the size of the gold nanoparticles. Generally, the larger the diameter of the gold nanoparticles, the more the wavelength of light absorbed by the solution shifts towards longer wavelengths, and the particles will exhibit the complementary color of the absorbed light.

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