Surface Reconstruction and Decahedral Structure of Bimetallic Nanoparticles

We report on energetic surface reconstruction phenomena observed on bimetallic nanoparticle systems of AuPd and AuCu, similar to a resolidification effect observed during the cooling process in lead clusters. These binary alloy nanoparticles show the fivefold edges truncated, resulting in { 100 } facets on decahedral structures, an effect largely envisioned and reported theoretically, with no experimental evidence so far. We demonstrate experimentally as well as by computational simulations that this new eutectic structure is favored in such nanoalloy systems.Fil: Rodríguez López J. L.. Instituto Potosino de Investigación Científica y Tecnológica ; MéxicoFil: Montejano Carrizales, J. M.. Universidad Autónoma de San Luis Potosí; MéxicoFil: Pal, U.. Universidad Auto´noma de Puebla; MéxicoFil: Sánchez Ramírez, J. F.. Universidad Auto´noma de Puebla; MéxicoFil: Troiani, Horacio Esteban. Comision Nacional de Energía Atómica. Gerencia de Área Investigaciones y Aplicaciones no Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Física de Metales; ArgentinaFil: García, D.. The University of Texas; Estados UnidosFil: Miki Yoshida, M.. The University of Texas; Estados UnidosFil: José Yacamán, Miguel. The University of Texas; Estados Unido