Adsorption Behavior of Gold Nanoparticles on Amino-terminated Micro Domains Fabricated on Quartz Substrate by Vacuum Ultra-violet Photolithography

Abstract

Immobilization of gold nanoparticles (AuNPs) onto quartz is of considerable interest in optoelectronic applications. In this paper, we demonstrated a linear arrangement of AuNPs by controlling the function and optical properties at the microstructure of a quartz surface through formation of a 3-aminopropyltriethoxysilane (APS) self-assembled monolayer and the subsequent vacuum ultraviolet lithography. Citrate-capped AuNPs have been arranged on an APS-terminated surface by electrostatic attraction and in a VUV irradiated area by electrostatic repulsion. In addition, the density of AuNPs on along the boundary of the linear feature was higher than that in the center during the initial stage of immersion. The density of AuNPs along the linear feature became uniform over the entire surface with increasing immobilization time. These results induced the electrostatic interaction of negatively charged AuNPs on the interface between differently charged surfaces.