Controlled Alloying of Au@Ag Core–Shell Nanorods Induced by Femtosecond Laser Irradiation. Issue 10 (7th March 2021)

• Record Type: Journal Article
• Authors: González‐Rubio, Guillermo; Díaz‐Núñez, Pablo; Albrecht, Wiebke; Manzaneda‐González, Vanesa; Bañares, Luis; Rivera, Antonio; Liz‐Marzán, Luis M.; Peña‐Rodríguez, Ovidio; Bals, Sara; Guerrero‐Martínez, Andrés
• Is Part Of: Advanced optical materials. Volume 9:Issue 10(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-03-07
• Subjects: alloys -- femtosecond pulse laser -- gold -- nanorods -- silver; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202002134
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Bimetallic nanoparticles display unique physical and chemical properties, including improved chemical stability, enhanced optical properties, or higher catalytic activity. Here, a synthetic methodology is described to obtain bimetallic heterostructures and alloyed plasmonic nanocrystals through the irradiation of colloidal Au@Ag core–shell nanorods (Au@Ag NRs) with femtosecond laser pulses. Depending on the energy deposited on the Au@Ag NRs, different morphologies and degrees of alloying are obtained, such as hot‐dog‐like and rice‐like (partially alloyed) NRs, as well as fully alloyed nanospheres. By using advanced electron microscopy techniques and energy‐dispersive X‐ray spectroscopy (EDX) tomography, both the morphology and the elemental distribution of the irradiated nanoparticles can be disclosed, and correlated to detailed investigations of their optical properties using electromagnetic simulations. The wide variety of bimetallic species provided by the proposed approach is a clear indication of the potential of combining synthetic colloidal methods with fs‐pulsed laser irradiation for the fabrication of unique multielemental nanoparticles. The resulting control over size and composition raises promising prospects for catalytic, plasmonic, and magnetic applications of multimetallic nanocrystals. Abstract : Irradiation of Au@Ag core–shell nanorods with fs‐laser pulses produces numerous different nanostructures at intermediate fluences, and only alloyed AuAg spheres at higher ones. This demonstrates the strong influence of the energy deposited on each particle by a single pulse over its ulterior evolution. This method opens the door to new approaches for the production of alloyed nanoparticles.