title: Facile electrochemical characterization of core/shell nanoparticles. Ag core/Ag(2)O shell structures.
abstract: We report in this paper a facile approach for the formation and electrochemical characterization of silver-silver oxide core-shell nanoparticles (NPs). Thus, thermal treatment at temperatures between 200 and 360 degrees C of Ag NP, in the gas phase or in an organic solvent, has been used to achieve the formation Ag@Ag2O NP. The evidence of formation of such a core-shell structure was obtained by cyclic voltammetry using a Nafion modified electrode (where Nafion containing carbon particles is used as the matrix to encapsulate the core-shell NP). Initial positive scans measure free Ag. Initial negative scans measure Ag2O, with the following positive scan, compared to the initial one, providing a measure of "trapped" or core Ag. The results presented demonstrate the utility of this approach in characterizing core-shell structures, like Ag@Ag2O, which could be extended to other core-shell forms, such as bimetallic core-shell NP.
authors.affiliation: Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712, USA.
authors.forename: Jalal
authors.initials: J
authors.lastname: Ghilane
authors.forename: Fu-Ren F
authors.initials: FR
authors.lastname: Fan
authors.forename: Allen J
authors.initials: AJ
authors.lastname: Bard
authors.forename: Nicholas
authors.initials: N
authors.lastname: Dunwoody