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Kirkendall Effect vs Corrosion of Silver Nanocrystals by Atomic Oxygen: From Solid Metal Silver to Nanoporous Silver Oxide

El Mel, A.-A. and Stephant, N. and Molina-Luna, Leopoldo and Gautron, E. and Haik, Y. and Tabet, N. and Tessier, P. Y. and Gautier, R. (2017):
Kirkendall Effect vs Corrosion of Silver Nanocrystals by Atomic Oxygen: From Solid Metal Silver to Nanoporous Silver Oxide.
In: J. Phys. Chem, 121 (35), ACS Publications, pp. 19497-19504, DOI: 10.1021/acs.jpcc.7b06030,
[Article]

Abstract

The corrosion of silver upon exposure to atomic oxygen is a unique effect reported in the 1980s and was highly studied to overcome the fast degradation of space shuttles in low earth orbit. In this work, we explored the conversion mechanisms of nanostructures from solid silver to nanoporous silver oxide upon exposure to radiofrequency air plasma. A broad panel of silver nanostructures with various shapes, sizes, and morphologies were considered to carefully examine the different stages of the oxidation process which evolve according to the considered model-system (e.g., nanosphere, nanowire, nanocube, or nanotriangle). Through a set of time-lapse studies and very specific experiments, we explained the generation of nanoporosity according to a mechanism based on two effects: (i) the high strain in the oxide shell generated as a consequence to the oxidation process and amplified by the bombardment of the material with the energetic species present in the radio frequency air plasma and (ii) the Kirkendall effect occurring at the Ag/Ag2O interface as a consequence to the unbalanced diffusion rates of silver and oxygen ions through the oxide shell.

Item Type: Article
Erschienen: 2017
Creators: El Mel, A.-A. and Stephant, N. and Molina-Luna, Leopoldo and Gautron, E. and Haik, Y. and Tabet, N. and Tessier, P. Y. and Gautier, R.
Title: Kirkendall Effect vs Corrosion of Silver Nanocrystals by Atomic Oxygen: From Solid Metal Silver to Nanoporous Silver Oxide
Language: English
Abstract:

The corrosion of silver upon exposure to atomic oxygen is a unique effect reported in the 1980s and was highly studied to overcome the fast degradation of space shuttles in low earth orbit. In this work, we explored the conversion mechanisms of nanostructures from solid silver to nanoporous silver oxide upon exposure to radiofrequency air plasma. A broad panel of silver nanostructures with various shapes, sizes, and morphologies were considered to carefully examine the different stages of the oxidation process which evolve according to the considered model-system (e.g., nanosphere, nanowire, nanocube, or nanotriangle). Through a set of time-lapse studies and very specific experiments, we explained the generation of nanoporosity according to a mechanism based on two effects: (i) the high strain in the oxide shell generated as a consequence to the oxidation process and amplified by the bombardment of the material with the energetic species present in the radio frequency air plasma and (ii) the Kirkendall effect occurring at the Ag/Ag2O interface as a consequence to the unbalanced diffusion rates of silver and oxygen ions through the oxide shell.

Journal or Publication Title: J. Phys. Chem
Volume: 121
Number: 35
Publisher: ACS Publications
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Advanced Electron Microscopy (aem)
Date Deposited: 06 Dec 2018 10:18
DOI: 10.1021/acs.jpcc.7b06030
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