Visible Light-Induced Immobilization of Gold Nanoparticles on Silicon Substrates

Abstract

Ordered and high-density AuNP structures were successfully immobilized on Si(111) substrates via a photochemical reaction, using the immersion method and the LB method, respectively. Because of partial oxidation of the substrate, island-like structures were formed using the immersion method. While that in the LB method, because AuNPs were immobilized in nitrogen atmosphere and not in liquid solution, oxidation was minimized thus a more compact structure was obtained. Furthermore, the plasmonic properties of the AuNP structure were found to be tunable by controlling the particle density and the interparticle distance.