We report the colloidal synthesis of hollow dual-plasmonic nanoparticles (NPs) using Au@Cu2O core-shell NPs as a template and exploiting nanoscale Kirkendall effect. In our synthesis we used organic compounds as a source of chalcogenide ions for anion exchange reaction. The resulting structures possess different features depending on the chalcogenide precursor employed. The divergence of architectures caused distinct optical properties of Au@Cu2-xS and Au@Cu2-xSe NPs. This synthetic approach is an effective pathway for maneuvering the size of interior voids by varying the concentration of chalcogenide ions in reaction mixture. The insights gained from this work will enrich the synthetic toolbox at the nanoscale and guide us on the rational design of multicomponent plasmonic nanoparticles with precisely controlled hollow interiors and sophisticated geometries, further enhancing our capabilities to fine-tune the electronic, optical, compositional, and physicochemical properties.

Facile aqueous synthesis of hollow dual plasmonic hetero-nanostructures with tunable optical responses through the nanoscale kirkendall effects

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