Abstract
Bimetallic Au@Ag nanoclusters have been shown to possess unique properties compared to their monometallic Au or Ag nanoclusters. In the present work, the optical properties of three bimetallic nanoclusters, namely, Au15@Ag, Au18@Ag, and Au25@Ag have been investigated by steady-state and time-resolved absorption and emission and two-photon absorption measurements. The nanoclusters are composed of a gold core and an alternating Au–Ag–ligand surface shell structure. We observed that the absorption and emission of the bimetallic Au@Ag nanoclusters are enhanced compared to the pure Au nanoclusters; the emission is, additionally, blue shifted. All of the mixed clusters showed impressive two-photon absorption coefficients with Au25@Ag showing a largely enhanced effect. The excited state dynamics of the Au@Ag nanoclusters was studied by time-resolved transient absorption and emission, which show that the bimetallic nanoclusters have longer excited state lifetimes than the Au nanoclusters. Specifically, the surfac...
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