Correlated Electrochemical and Optical Detection Reveals the Chemical Reactivity of Individual Silver Nanoparticles Vitor Brasiliense Anisha N. Patel Ariadna Martinez-Marrades Jian Shi Yong Chen Catherine Combellas Gilles Tessier Frédéric Kanoufi 10.1021/jacs.5b13217.s002 https://acs.figshare.com/articles/media/Correlated_Electrochemical_and_Optical_Detection_Reveals_the_Chemical_Reactivity_of_Individual_Silver_Nanoparticles/3081004 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 <i>in situ</i> the concept of EC nanoimpacts for sizing and counting of NPs. Chemical complexity is introduced by using a precipitating agent, SCN<sup>–</sup>, 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. 2016-02-22 00:00:00 chemical complexity Correlated Electrochemical charge transfer process SCN chemical transformation EC spikes Ag NPs charge transfer Chemical Reactivity Individual Silver Nanoparticles Electrochemical EC nanoimpacts dissolution steps EC signals chemical processes Optical Detection