Energy dispersive X-ray spectroscopy of bimetallic nanoparticles in an aberration corrected scanning transmission electron microscope

Herzing, Andrew A., Watanabe, Masashi, Edwards, Jennifer Kelly ORCID: https://orcid.org/0000-0003-4089-2827, Conte, Marco, Tang, Zi-Rong, Hutchings, Graham John ORCID: https://orcid.org/0000-0001-8885-1560 and Kiely, Christopher John ORCID: https://orcid.org/0000-0001-5412-0970 2008. Energy dispersive X-ray spectroscopy of bimetallic nanoparticles in an aberration corrected scanning transmission electron microscope. Faraday Discussions 138 , pp. 337-351. 10.1039/b706293c

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Abstract

The technique of X-ray energy dispersive spectroscopy (XEDS) spectrum imaging in a dedicated scanning transmission electron microscope (STEM) is discussed in relation to its applicability to bimetallic nanoparticles. It is shown that the recent availability of aberration corrected microscopes and multivariate statistical analysis (MSA) techniques has allowed us to overcome many of the intrinsic limitations previously encountered when attempting STEM-XEDS spectrum imaging on nanoscopic volumes of material. We demonstrate through a variety of applications to Au–Ag and Au–Pd bimetallic nanoparticle systems, that STEM-XEDS can provide invaluable high spatial resolution compositional information on (i) alloy homogeneity and phase segregation effects within individual nanoparticles, (ii) particle size–alloy composition correlations, (iii) the detection of trace amounts of alloying element and (iv) metal component distribution in extremely highly dispersed catalyst systems.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	Royal Society of Chemistry
ISSN:	1364-5498
Last Modified:	17 Oct 2022 09:52
URI:	https://orca.cardiff.ac.uk/id/eprint/5986

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