Contribution of chemical interface damping to the shift of surface plasmon resonance energy of gold nanoparticles

摘要

The effects that determine the shift and damping of the surface plasmonresonance (SPR) band of colloidal gold nanoparticles due to the chemisorption oftetrahydroxyborate (B(OH) 4 ) anions are analyzed experimentally and theoretically.The contribution of chemical interface damping, change in refractive index and chargedensity variations to the experimentally observed shift of the SPR band are evaluatedqualitatively by simulating the optical response of gold nanoparticles upon thechemisorption of B(OH) 4 anions. The results show that changing the refractive indexof the medium and the charge density cannot account entirely for the shift of the SPRband. Thus, chemical interface damping should be considered when analyzing surfaceeffects in the presence of strongly chemisorbed adsorbates.