Ag-Pt nanoalloys - measurements datas

Ag and Pt bilayers with a total thickness of 8 nm were deposited using DC magnetron sputtering, followed by annealing at 650 °C under an argon atmosphere. The process induced the transformation of continuous bilayers into isolated nanoislands through solid-state dewetting. SEM and TEM analyses revealed the formation of well-defined, nearly spherical nanoislands with a homogeneous elemental distribution, as measured by the EDS method. Additionally, XPS measurements confirmed the coexistence of both metals in metallic states, with a slight Ag deficiency attributed to its higher instability and desorption during the annealing process. Optical measurements revealed the presence of a single resonance peak. The composition-dependent plasmonic resonance band for low Pt contents was observed, and its progressively blue-shiftng and decreasing in intensity with increasing Pt concentration. This behavior is consistent with the strong d-electron contribution of platinum, which suppresses plasmonic oscillations.