Enhancement of Photoluminescence in MoS 2 on Ag Nanowires due to the Surface Plasmon Effect

Monolayer (ML) molybdenum disulfide (MoS 2 ) is a promising material for next-generation optoelectronic applications because MoS 2 exhibits remarkable electronic and optical properties owing to its flexibility and direct bandgap. Despite these outstanding properties, MoS 2 has limitations in fabricating optoelectronic devices because of its low quantum yield. To overcome these limitations, we propose a photoluminescence (PL) enhancement technique using a surface plasmon effect induced by transferring ML MoS 2 onto Ag nanowires (NWs). We observed the surface-enhanced PL signals from ML MoS 2 on Ag NWs and investigated the effect of the diameter of the latter. Furthermore, we explored the origin of efficient PL enhancement using Ag NWs through theoretical simulations. Our experimental and theoretical studies are useful for the application of ML transition-metal dichalcogenides in flexible nano-optoelectronics.