title: Correlated Electrochemical and Optical Detection Reveals the Chemical Reactivity of Individual Silver Nanoparticles.
abstract: Electrochemical (EC) impacts of single nanoparticles (NPs) on an ultramicroelectrode are coupled with optics to identify chemical processes at the level of individual NPs. While the EC signals characterize the charge transfer process, the optical monitoring gives a complementary picture of the transport and chemical transformation of the NPs. This is illustrated in the case of electrodissolution of Ag NPs. In the simplest case, the optically monitored dissolution of individual NPs is synchronized with individual EC spikes. Optics then validates in situ the concept of EC nanoimpacts for sizing and counting of NPs. Chemical complexity is introduced by using a precipitating agent, SCN(-), which tunes the overall electrodissolution kinetics. Particularly, the charge transfer and dissolution steps occur sequentially as the synchronicity between the EC and optical signals is lost. This demonstrates the level of complexity that can be revealed from such electrochemistry/optics coupling.
authors.affiliation: Sorbonne Paris Cité, Université Paris Diderot, Interfaces, Traitements, Organisation et Dynamique des Systèmes, CNRS-UMR 7086 , 15 rue J. A. Baif, F-75013 Paris, France.
authors.forename: Vitor
authors.initials: V
authors.lastname: Brasiliense
authors.affiliation: Sorbonne Paris Cité, Université Paris Diderot, Interfaces, Traitements, Organisation et Dynamique des Systèmes, CNRS-UMR 7086 , 15 rue J. A. Baif, F-75013 Paris, France.
authors.forename: Anisha N
authors.initials: AN
authors.lastname: Patel
authors.affiliation: Sorbonne Paris Cité, Université Paris Descartes, Neurophotonics Laboratory, CNRS-UMR 8250 , 45 rue des Saints-Pères, F-75006 Paris, France.
authors.forename: Ariadna
authors.initials: A
authors.lastname: Martinez-Marrades
authors.affiliation: Chemistry Department, Ecole Normale Supérieure-PSL Research University CNRS-UMR 8640 , 24 Rue Lhomond, F-75005 Paris, France.
authors.forename: Jian
authors.initials: J
authors.lastname: Shi
authors.affiliation: Chemistry Department, Ecole Normale Supérieure-PSL Research University CNRS-UMR 8640 , 24 Rue Lhomond, F-75005 Paris, France.
authors.forename: Yong
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Sorbonne Paris Cité, Université Paris Diderot, Interfaces, Traitements, Organisation et Dynamique des Systèmes, CNRS-UMR 7086 , 15 rue J. A. Baif, F-75013 Paris, France.
authors.forename: Catherine
authors.initials: C
authors.lastname: Combellas
authors.affiliation: Sorbonne Paris Cité, Université Paris Descartes, Neurophotonics Laboratory, CNRS-UMR 8250 , 45 rue des Saints-Pères, F-75006 Paris, France.
authors.forename: Gilles
authors.initials: G
authors.lastname: Tessier
authors.affiliation: Sorbonne Paris Cité, Université Paris Diderot, Interfaces, Traitements, Organisation et Dynamique des Systèmes, CNRS-UMR 7086 , 15 rue J. A. Baif, F-75013 Paris, France.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Kanoufi