Surface Plasmon Resonance of Gold and Silver
Surface Plasmon Resonance (SPR) of gold and silver is an important phenomenon in nanooptics and surface science, widely used in fields such as sensing, imaging, and optoelectronic devices. The following are the characteristics and applications of surface plasmon resonance in gold and silver:
Comparison of SPR Characteristics between Gold and Silver
Characteristics Gold (Au) Silver (Ag)
Resonance wavelength Visible to near-infrared region (~520 nm and above) Visible light region (~400 nm)
Resonance intensity Strong, but slightly lower than silver Stronger, with higher electric field enhancement effect
Chemical stability High, strong oxidation resistance Low, easy to oxidize (easy to form an oxide layer on the surface)
Biocompatibility High, often used in biosensors Low, easy to react with biological molecules
Application areas Biosensors, medical diagnosis, optoelectronic devices High-sensitivity sensing, surface-enhanced Raman scattering