title: Silver Ions Direct Twin-Plane Formation during the Overgrowth of Single-Crystal Gold Nanoparticles.
abstract: It is commonly agreed that the crystalline structure of seeds dictates the crystallinity of final nanoparticles in a seeded-growth process. Although the formation of monocrystalline particles does require the use of single-crystal seeds, twin planes may stem from either single- or polycrystalline seeds. However, experimental control over twin-plane formation remains difficult to achieve synthetically. Here, we show that a careful interplay between kinetics and selective surface passivation offers a unique handle over the emergence of twin planes (in decahedra and triangles) during the growth over single-crystalline gold nanoparticles of quasi-spherical shape. Twinning can be suppressed under conditions of slow kinetics in the presence of silver ions, yielding single-crystalline particles with high-index facets.
authors.affiliation: Bionanoplasmonics Laboratory, CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia - San Sebastián, Spain; Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain.
authors.forename: Marek
authors.initials: M
authors.lastname: Grzelczak
authors.affiliation: Bionanoplasmonics Laboratory, CIC biomaGUNE , Paseo de Miramón 182, 20009 Donostia - San Sebastián, Spain.
authors.forename: Ana
authors.initials: A
authors.lastname: Sánchez-Iglesias
authors.affiliation: EMAT-University of Antwerp , Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
authors.forename: Hamed
authors.initials: H
authors.lastname: Heidari
authors.affiliation: EMAT-University of Antwerp , Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
authors.forename: Sara
authors.initials: S
authors.lastname: Bals
authors.affiliation: Departamento de Química Física, Universidade de Vigo , 36310 Vigo, Spain.
authors.forename: Isabel
authors.initials: I
authors.lastname: Pastoriza-Santos
authors.affiliation: Departamento de Química Física, Universidade de Vigo , 36310 Vigo, Spain.
authors.forename: Jorge
authors.initials: J
authors.lastname: Pérez-Juste
authors.affiliation: Bionanoplasmonics Laboratory, CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia - San Sebastián, Spain; Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain.
authors.forename: Luis M
authors.initials: LM
authors.lastname: Liz-Marzán