Study of Gold nanoparticles binding dynamics on functionalized surface by ATR-evanescent wave absorption method

In this work, gold nanoparticles (AuNPs) binding dynamics have been studied on the amine-functionalized surface by the attenuated total reflectance (ATR) based evanescent wave absorption method. During binding, the real-time absorption peak of localized surface plasmon resonance (LSPR) was monitored. The immobilization time has been found to be decreased with the higher molar concentration of AuNPs. The density of immobilized nanoparticles was confirmed by SEM micrograph analysis. The concentration-dependent gold nanoparticle immobilization on a functionalized surface has been studied to explore and understand the role of selective LSPR surface for plasmonic-based photonic sensing platform development.