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Corrosion of Au particles in air-exposed NaI-treated Au colloidal suspensions

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Abstract

This study examines the influence of the treatment of citrate-capped Au colloidal particles with NaI under exposure to air. Whereas in the NaI-treated centrifugate of the Au colloidal suspension the iodide-induced formation of triiodide runs spontaneously, its accumulation is found to be strongly decelerated in the Au colloidal suspension under the same conditions. In accordance with the experimental findings from electron absorption spectroscopy and transmission electron microscopy, a mechanism is proposed which describes the oxidation of the Au particles by oxygen under intermediate participation of triiodide.

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Acknowledgement

This work was funded by the Center for Functional Nanostructures, which is a research centre of the Deutsche Forschungsgemeinschaft.

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  1. Laboratorium für Elektronenmikroskopie, Universität Karlsruhe (TH), 76128, Karlsruhe, Germany

    Matthias Wanner & Dagmar Gerthsen

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  1. Matthias Wanner
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  2. Dagmar Gerthsen
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Correspondence to Matthias Wanner.

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Wanner, M., Gerthsen, D. Corrosion of Au particles in air-exposed NaI-treated Au colloidal suspensions. Colloid Polym Sci 282, 1126–1132 (2004). https://doi.org/10.1007/s00396-003-1046-3

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  • DOI: https://doi.org/10.1007/s00396-003-1046-3

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