What are the Optical Properties of Gold Nanoparticles?
Gold nanoparticles exhibit a phenomenon known as surface plasmon resonance (SPR), where free electrons on the nanoparticle surface oscillate in response to light. This results in strong absorption and scattering of light, giving AuNPs their distinctive red or blue color depending on their size and shape. SPR is highly sensitive to the local environment, making AuNPs ideal for use in various biosensing applications.
