Characterising the surface and interior chemistry of core-shell nanoparticles using scanning transmission electron microscopy

Mendis, B.G. and Craven, A. (2011) Characterising the surface and interior chemistry of core-shell nanoparticles using scanning transmission electron microscopy. Ultramicroscopy, 111(3), pp. 212-226. (doi:10.1016/j.ultramic.2010.11.002)

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Abstract

A method for extracting core and shell spectra from core–shell particles with varying core to shell volume fractions is described. The method extracts the information from a single EELS spectrum image of the particle. The distribution of O and N was correctly reproduced for a nanoparticle with a TiN core and Ti-oxide shell. In addition, the O distribution from a nanoparticle with a Cu core and a Cu-oxide shell was obtained, and the extracted Cu L2,3-core and shell spectra showed the required change in EELS near edge fine structure. The extracted spectra can be used for multiple linear least squares fitting to the raw data in the spectrum image. The effect of certain approximations on numerical accuracy, such as treating the nanoparticle as a perfect sphere, as well as the intrinsic detection limits of the technique have also been explored. The technique is most suitable for qualitative, rather than quantitative, work.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Mendis, Dr Budhika and Craven, Professor Alan
Authors: Mendis, B.G., and Craven, A.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Ultramicroscopy
Publisher:Elsevier
ISSN:0304-3991
ISSN (Online):1879-2723
Published Online:11 November 2010
Copyright Holders:Copyright © 2010 Elsevier B.V.
First Published:First published in Ultramicroscopy 111 (3) : 212-226
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher.

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
413371SuperSTEM - the UK aberration corrected STEM facilityAlan CravenEngineering & Physical Sciences Research Council (EPSRC)EP/D040205/1Physics and Astronomy