title: Real-Time Dynamics of Galvanic Replacement Reactions of Silver Nanocubes and Au Studied by Liquid-Cell Transmission Electron Microscopy.
abstract: We study the galvanic replacement reaction of silver nanocubes in dilute, aqueous ethylenediaminetetraacetic acid disodium salt (EDTA)-capped gold aurate solutions using in situ liquid-cell electron microscopy. Au/Ag etched nanostructures with concave faces are formed via (1) etching that starts from the faces of the nanocubes, followed by (2) the deposition of an Au layer as a result of galvanic replacement, and (3) Au deposition via particle coalescence and monomer attachment where small nanoparticles are formed during the reaction as a result of radiolysis. Analysis of the Ag removal rate and Au deposition rate provides a quantitative picture of the growth process and shows that the morphology and composition of the final product are dependent on the stoichiometric ratio between Au and Ag.
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, 117543, Singapore.
authors.forename: Shu Fen
authors.initials: SF
authors.lastname: Tan
authors.affiliation: Centre for Bioimaging Sciences and Department of Biological Sciences, National University of Singapore , 14 Science Drive 4, 117543, Singapore.|Department of Physics, National University of Singapore , 2 Science Drive 3, 117551, Singapore.|NUSNNI-NanoCore, National University of Singapore , 5A Engineering Drive 1, 117411, Singapore.|Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore , 6 Science Drive 2, 117546, Singapore.
authors.forename: Guanhua
authors.initials: G
authors.lastname: Lin
authors.affiliation: Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , 2 Fusionopolis Way, 138634, Singapore.|Department of Materials Science and Engineering, National University of Singapore , 9 Engineering Drive 1, 117575, Singapore.
authors.forename: Michel
authors.initials: M
authors.lastname: Bosman
authors.affiliation: Centre for Bioimaging Sciences and Department of Biological Sciences, National University of Singapore , 14 Science Drive 4, 117543, Singapore.|Department of Physics, National University of Singapore , 2 Science Drive 3, 117551, Singapore.|NUSNNI-NanoCore, National University of Singapore , 5A Engineering Drive 1, 117411, Singapore.|Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore , 6 Science Drive 2, 117546, Singapore.
authors.forename: Utkur
authors.initials: U
authors.lastname: Mirsaidov
authors.affiliation: Department of Chemistry, National University of Singapore , 3 Science Drive 3, 117543, Singapore.|Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore , 6 Science Drive 2, 117546, Singapore.
authors.forename: Christian A
authors.initials: CA
authors.lastname: Nijhuis
keywords: galvanic replacement; growth kinetics; in situ TEM; nanoparticle growth; reaction dynamics