Nano Lett. 2007 May;7(5):1406-12. doi: 10.1021/nl070268p. Epub 2007 Apr 03.

Facile electrochemical characterization of core/shell nanoparticles. Ag core/Ag(2)O shell structures.

Nano letters

Jalal Ghilane, Fu-Ren F Fan, Allen J Bard, Nicholas Dunwoody

PMID: 17402789 DOI: 10.1021/nl070268p

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.

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• Journal Article