Detection of Silver Nanoparticles by Electrochemically Activated Galvanic Exchange.

ABSTRACT: Here we report on the seemingly simple process of galvanic exchange (GE) between electrogenerated AuCl₄^- and silver nanoparticles (AgNPs). The results were obtained in the specific context of using AgNPs as labels for bioassays in paper fluidic devices. Results obtained from a combined electrochemistry and microscopy study indicate that the GE process results in recovery of only ∼5% of the total equivalents of Ag present in the system. This low value is a consequence of two factors. First, after an initial fraction of each AgNP undergoes GE, a Au shell forms around the remaining AgNP core preventing further exchange. Second, to simulate a true biological fluid, the experiments were carried out in a Cl^--containing buffer. Consequently, some Ag⁺ fo

SUBMITTER: Kogan MR 

PROVIDER: S-EPMC6600828 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature