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Double oxide shell layer formed on a metal nanoparticle as revealed by aberration corrected (scanning) transmission electron microscopy
Linköping University, Department of Physics, Chemistry and Biology, Plasma and Coating Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-6602-7981
Linköping University, Department of Physics, Chemistry and Biology, Plasma and Coating Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-3767-225X
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden.
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2014 (English)In: Materials Research Express, E-ISSN 2053-1591, Vol. 1, no 2, article id 025016Article in journal (Refereed) Published
Abstract [en]

Determining the extent of oxidation in batches of metal nanoparticles is essential to predict the behaviour of the material. Using aberration corrected transmission electron microscopy (TEM) it was possible to detect the formation of an oxide shell, of thickness 3 nm, on the surface of copper nanoparticles. Further analysis showed that this shell actually consists of two layers, both of which were polycrystalline in nature with domains in the size range of 1-2 nm, and having a thickness of 1.5 nm each. Energy dispersive x-ray spectroscopy confirms that the layers arise due to the formation of oxides, but it was not possible to determine their exact nature. Analysis of the intensity variation within images obtained via probe corrected scanning TEM combined with a high angle annular dark field detector indicates that the shell consists of an inner layer of cuprous oxide (Cu2O) and an outer layer of cupric oxide (CuO). This work was complemented by conventional TEM which provided size distribution and revealed that the majority of particles have a core consisting of a single crystal of copper. This demonstrates the ability of TEM to help to determine the oxidation state of nanoparticles and its potential to be applied to a wide range of homogenous and heterogeneous nanoparticles.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2014. Vol. 1, no 2, article id 025016
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Physical Sciences
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URN: urn:nbn:se:liu:diva-134760DOI: 10.1088/2053-1591/1/2/025016ISI: 000209665000016OAI: oai:DiVA.org:liu-134760DiVA, id: diva2:1076853
Available from: 2017-02-24 Created: 2017-02-24 Last updated: 2017-03-28

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