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Thermodynamics of faceted palladium(-gold) nanoparticle supported on rutile titania nanorods studied by transmission electron microscopy

Abstract

Many physical properties of nanoparticles (NPs) are driven by their equilibrium shape (ES). Thus, knowing the kinetic and thermodynamic parameters that affect particle morphology is key for the rational design of NPs with targeted properties. We report here on the thermodynamic ES of supported monometallic palladium and bimetallic palladium-gold (Pd-Au) single-crystalline truncated nanooctahedra (TOs) studied by aberration-corrected transmission electron microscopy (TEM). Monometallic palladium and bimetallic Pd62Au38 and Pd43Au57 TOs were grown by pulsed laser deposition on rutile titania (r-TiO2) nanorods exposing mainly (110) facets. Particle structure and dimension were first obtained by aberration-corrected high resolution TEM (HRTEM) images acquired parallel to the metal-oxide interface. By fitting an extended Wulff-Kaishev rule to HRTEM data of truncated octahedral thermodynamic ES in the size range 2 to 5 nm, we secondly determined the interface and excess line energies associated with the particle-oxide-vacuum triple phase junction in Pd and Pd43Au57 TOs in epitaxial relationship Pd(-Au)(111)<101> // r-TiO2(110)[1-1-1] and in Pd62Au38 TOs in epitaxial relationship Pd62Au38(100)<101> // r-TiO2(110)[1-10]. Our results show a decrease in particle adhesion on the oxide support upon alloying Pd with Au. The loss in adhesion is tentatively attributed to the increase of the lattice strain induced at the metal-oxide interface as gold atoms are added to the palladium lattice.

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Publication details

The article was received on 01 Feb 2018, accepted on 05 Apr 2018 and first published on 05 Apr 2018


Article type: Paper
DOI: 10.1039/C8CP00737C
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Thermodynamics of faceted palladium(-gold) nanoparticle supported on rutile titania nanorods studied by transmission electron microscopy

    N. T. Nguyen, J. Nelayah, D. Alloyeau, G. Wang, L. Piccolo, P. Afanasiev and C. Ricolleau, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP00737C

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