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Publication - Dr Tomas Martin

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

    Citation

    Yang, Q, Danaie, M, Young, N, Broadley, V, Joyce, DE, Martin, TL, Marceau, E, Moody, MP & Bagot, PA, 2019, ‘Atom probe tomography of Au-Cu bimetallic nanoparticles synthesized by inert gas condensation’. Journal of Physical Chemistry C.

    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.

    Full details in the University publications repository