Atom probe tomography of Au-Cu bimetallic nanoparticles synthesized by inert gas condensation

Q. Yang*, M. Danaie, N. Young, V. Broadley, D. E. Joyce, T. L. Martin, E. Marceau, M. P. Moody, P. A.J. Bagot

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

1 Citation (Scopus)
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Abstract

The inert gas condensation method (IGC) produces multimetallic nanoparticles in a metastable state that may exhibit heterogeneities of size, structure, and composition. The deposition of IGC-fabricated nanoparticles on substrates allows for a detailed characterization by combination of aberration-corrected scanning transmission electron microscopy (TEM) and atom probe tomography (APT). Multiple particle monitoring and high-resolution scanning TEM give access to the size distribution of Au-Cu nanoparticles (<10 nm in diameter, bimodal distribution). TEM and APT show that the alloying between Cu and Au may stabilize the Ih structure for smaller particles (<4 nm). Combining high-resolution scanning transmission electron microscopy/energy dispersive X-ray and three-dimensional composition analysis by APT reveals that an excess of Cu may be present in a shell around the larger particles (>7 nm), while Cu is more randomly distributed in smaller particles.

Original languageEnglish
Pages (from-to)26481-26489
Number of pages9
JournalJournal of Physical Chemistry C
Volume123
Early online date4 Oct 2019
DOIs
Publication statusPublished - 31 Oct 2019

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