Tuning the morphology and chemical distribution of Ag atoms in Au rich nanoparticles using electrochemical dealloying
Alexandra Dworzak, Paul Paciok, Christoph Mahr, Marc Heggen, Carsten Dosche, Andreas Rosenauer, Mehtap Oezaslan
Abstract
NPs remain dense and solid, but Ag distribution and thickness of the Au passivation layer vary between both dealloying protocols. When the Au passivation layer is very thin, the residual Ag atoms tend to segregate to the particle surface after dealloying. Due to the size effect, small NPs are less electrochemically stable and show a lower critical dealloying potential. In this systematic study, we demonstrate that the mobility of Au surface atoms and dealloying conditions control the structure and residual Ag distribution within dealloyed NPs.
Topics & Concepts
ElectrochemistryMaterials scienceNanoparticleMorphology (biology)Atom (system on chip)Chemical engineeringNanotechnologyMetallurgyPhysical chemistryChemistryElectrodeGeneticsComputer scienceEmbedded systemEngineeringBiologyNanoporous metals and alloysElectrocatalysts for Energy ConversionNanomaterials for catalytic reactions