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Enhanced oxidation of nanoparticles through strain-mediated ionic transport

Enhanced oxidation of nanoparticles through strain-mediated ionic transport
Enhanced oxidation of nanoparticles through strain-mediated ionic transport
Geometry and confinement effects at the nanoscale can result in substantial modifications to a material’s properties with significant consequences in terms of chemical reactivity, biocompatibility and toxicity. Although benefiting applications across a diverse array of environmental and technological settings, the long-term effects of these changes, for example in the reaction of metallic nanoparticles under atmospheric conditions, are not well understood. Here, we use the unprecedented resolution attainable with aberration-corrected scanning transmission electron microscopy3 to study the oxidation of cuboid Fe nanoparticles. Performing strain analysis at the atomic level, we reveal that strain gradients induced in the confined oxide shell by the nanoparticle geometry enhance the transport of diffusing species, ultimately driving oxide domain formation and the shape evolution of the particle. We conjecture that such a strain-gradient-enhanced mass transport mechanism may prove essential for understanding the reaction of nanoparticles with gases in general, and for providing deeper insight into ionic conductivity in strained nanostructures.
1476-1122
26-30
Pratt, Andrew
ca3581c3-7460-4efb-a92f-568364535643
Lari, Leonardo
aadac595-cd54-4052-bc21-4bb81b6b95e3
Hovorka, Ondrej
a12bd550-ad45-4963-aa26-dd81dd1609ee
Shah, Amish
5b432474-c4fe-407e-9bf0-be9122e2554f
Woffinden, Charles
82b4d5c0-1a10-41cf-a45e-4ec0b937196b
Tear, Steve P.
1203a9d8-c0db-4d73-8bfa-6cc98819531f
Binns, Chris
f107651c-2b55-4751-9830-7741a19d94eb
Kröger, Roland
81d45bb6-2855-46e5-8d8b-7436ca668238
Pratt, Andrew
ca3581c3-7460-4efb-a92f-568364535643
Lari, Leonardo
aadac595-cd54-4052-bc21-4bb81b6b95e3
Hovorka, Ondrej
a12bd550-ad45-4963-aa26-dd81dd1609ee
Shah, Amish
5b432474-c4fe-407e-9bf0-be9122e2554f
Woffinden, Charles
82b4d5c0-1a10-41cf-a45e-4ec0b937196b
Tear, Steve P.
1203a9d8-c0db-4d73-8bfa-6cc98819531f
Binns, Chris
f107651c-2b55-4751-9830-7741a19d94eb
Kröger, Roland
81d45bb6-2855-46e5-8d8b-7436ca668238

Pratt, Andrew, Lari, Leonardo, Hovorka, Ondrej, Shah, Amish, Woffinden, Charles, Tear, Steve P., Binns, Chris and Kröger, Roland (2013) Enhanced oxidation of nanoparticles through strain-mediated ionic transport. Nature Materials, 13 (1), 26-30. (doi:10.1038/nmat3785).

Record type: Article

Abstract

Geometry and confinement effects at the nanoscale can result in substantial modifications to a material’s properties with significant consequences in terms of chemical reactivity, biocompatibility and toxicity. Although benefiting applications across a diverse array of environmental and technological settings, the long-term effects of these changes, for example in the reaction of metallic nanoparticles under atmospheric conditions, are not well understood. Here, we use the unprecedented resolution attainable with aberration-corrected scanning transmission electron microscopy3 to study the oxidation of cuboid Fe nanoparticles. Performing strain analysis at the atomic level, we reveal that strain gradients induced in the confined oxide shell by the nanoparticle geometry enhance the transport of diffusing species, ultimately driving oxide domain formation and the shape evolution of the particle. We conjecture that such a strain-gradient-enhanced mass transport mechanism may prove essential for understanding the reaction of nanoparticles with gases in general, and for providing deeper insight into ionic conductivity in strained nanostructures.

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More information

e-pub ahead of print date: 19 September 2013
Published date: 3 November 2013
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 381818
URI: http://eprints.soton.ac.uk/id/eprint/381818
ISSN: 1476-1122
PURE UUID: f65b1b76-d076-4239-b181-710fdcbd7b84
ORCID for Ondrej Hovorka: ORCID iD orcid.org/0000-0002-6707-4325

Catalogue record

Date deposited: 30 Sep 2015 16:17
Last modified: 18 Feb 2021 17:22

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Contributors

Author: Andrew Pratt
Author: Leonardo Lari
Author: Ondrej Hovorka ORCID iD
Author: Amish Shah
Author: Charles Woffinden
Author: Steve P. Tear
Author: Chris Binns
Author: Roland Kröger

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