Femtosecond Carrier Dynamics in Gold-MoS$_{\mathrm{2}}$ Hybrid Nanostructures

Small plasmonic nanoparticles are known to efficiently generate energetic hot carriers [1] that can be harnessed by injecting them across a Schottky barrier. To understand the role of plasmon-induced hot carrier generation across Schottky junctions in photocatalytic processes, we synthesized quasi-2D MoS$_{\mathrm{2}}$ monolayer flakes decorated with Au nanoparticles in ethanol. Our goal is to study ultrafast plasmon induced electron injection from Au nanospheres into MoS$_{\mathrm{2}}$ monolayer flakes. We will present femtosecond transient absorption measurements on MoS$_{\mathrm{2}}$/Au hybrid nanoparticles in ethanol solvent, and compare them with neat MoS$_{\mathrm{2}}$ flakes in ethanol. \newline ~[1] Nano Letters, 2015, 15 (9), p 6155