Laser synthesis of Au/Ag colloidal nano-alloys: Optical properties, structure and composition |
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| Authors: | Giuseppe Compagnini Elena Messina Valeria Nicolosi |
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| Institution: | a Dipartimento di Scienze Chimiche, Università di Catania, Laboratorio Film Sottili e Nanostrutture, Viale A.Doria 6, Catania 95125, Italy
b Department of Physics, University of Dublin, Trinity College, Dublin 2, Ireland |
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| Abstract: | We have successfully synthesized Au/Ag colloidal nano-alloys with a wide range of compositions by laser ablation of single metal targets in water and a re-irradiation of mixed colloidal suspensions. The optical extinction spectra have been obtained in the plasmon resonance region and their analysis by using the Mie-Gans approach has lead to a quantitative estimation of a number of different structural features for the sols. Some of the obtained results are supported by X-ray photoelectron data and transmission electron microscopy, while others are used to investigate the kinetics of formation of the nano-alloys under laser irradiation. |
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| Keywords: | Laser ablation Optical properties Colloids Nano-alloys Plasmon resonance |
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