Plasmonic Gold Nanoparticle-Decorated Ultrathin SnO2 Nanosheets with Superior Ultraviolet and Visible Photoresponsivity

Abstract

Ultrathin transparent semiconducting oxides have attracted considerable attention in multifunctional electronic and optoelectronic devices, owing to their exciting physical properties and excellent stability. However, due to their wide bandgap, absorption in the visible region is very limited. Here, we show enhanced light-matter interactions by integrating plasmonic gold nanoparticles onto ultrathin SnO2 nanosheets, leading to higher optical absorption in the visible spectra. In this work, a vacuum-free liquid metal printing technique is used to deposit large-area ∼1.9 nm thick SnO2 nanosheets, which were then decorated with gold nanoparticles by utilizing an electrostatic self-assembly tech..