title: Experimental evidence of icosahedral and decahedral packing in one-dimensional nanostructures.
abstract: The packing of spheres is a subject that has drawn the attention of mathematicians and philosophers for centuries and that currently attracts the interest of the scientific community in several fields. At the nanoscale, the packing of atoms affects the chemical and structural properties of the material and, hence, its potential applications. This report describes the experimental formation of 5-fold nanostructures by the packing of interpenetrated icosahedral and decahedral units. These nanowires, formed by the reaction of a mixture of metal salts (Au and Ag) in the presence of oleylamine, are obtained when the chemical composition is specifically Ag/Au = 3:1. The experimental images of the icosahedral nanowires have a high likelihood with simulated electron micrographs of structures formed by two or three Boerdijk-Coxeter-Bernal helices roped on a single structure, whereas for the decahedral wires, simulations using a model of adjacent decahedra match the experimental structures. To our knowledge, this is the first report of the synthesis of nanowires formed by the packing of structures with 5-fold symmetry. These icosahedral nanowire structures are similar to those of quasicrystals, which can only be formed if at least two atomic species are present and in which icosahedral and decahedral packing has been found for bulk crystals.
authors.affiliation: Department of Physics and Astronomy, The University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, USA.
authors.forename: J Jesús
authors.initials: JJ
authors.lastname: Velázquez-Salazar
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Esparza
authors.forename: Sergio Javier
authors.initials: SJ
authors.lastname: Mejía-Rosales
authors.forename: Rubén
authors.initials: R
authors.lastname: Estrada-Salas
authors.forename: Arturo
authors.initials: A
authors.lastname: Ponce
authors.forename: Francis Leonard
authors.initials: FL
authors.lastname: Deepak
authors.forename: Carlos
authors.initials: C
authors.lastname: Castro-Guerrero
authors.forename: Miguel
authors.initials: M
authors.lastname: José-Yacamán