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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Naitabdi, Ahmed
Sorbonne Université
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (7/7 displayed)
- 2018CO oxidation activity of Pt, Zn and ZnPt nanocatalysts: a comparative study by in situ near-ambient pressure X-ray photoelectron spectroscopycitations
- 2016Real-Time X-ray Photoemission Spectroscopy Study of Si(001)-2×1 Exposed to Water Vapor: Adsorption Kinetics, Fermi Level Positioning, and Electron Affinity Variationscitations
- 2015Water adsorption on TiO2 surfaces probed by soft X-ray spectroscopies: bulk materials vs. isolated nanoparticlescitations
- 2013Method for forming thermally stable nanoparticles on supports
- 2010Sixton rectangles in the structure of alumina ultrathin films on metals
- 2009Nanostructured zinc oxide films synthesized by successive chemical solution deposition for gas sensor applications
- 2009Phonon density of states of self-assembled isolated Fe-rich Fe-Pt alloy nanoclusters
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article
Phonon density of states of self-assembled isolated Fe-rich Fe-Pt alloy nanoclusters
Abstract
he Fe-projected phonon density of states (PDOS) of monolayer-thick films of self-assembled, size-selected, isolated (57)Fe(1-x)Pt(x) alloy nanoclusters (NCs) (height: similar to 2 nm, diameter: similar to 8 nm) supported on flat SiO(2)/Si(111) substrates has been measured by nuclear resonant inelastic x-ray scattering. The samples were characterized by atomic force microscopy (AFM), transmission electron microscopy, and x-ray photoelectron spectroscopy (XPS). Surface segregation of Pt and PtSi formation at the NC surface due to the sample-preparation process is inferred from the XPS data. As compared to the bulk, pronounced modifications of the PDOS beyond the bulk cut-off energy are observed in bcc (57)Fe(0.8)Pt(0.2) (core)/PtSi(shell) NCs. By contrast, the PDOS of fcc (57)Fe(0.75)Pt(0.25) (core)/PtSi(shell) NCs retains features of bulk ordered Fe(3)Pt Invar alloys (presumably due to a thicker PtSi shell), in particular, the transverse-acoustic [110]TA(1) mode near 9 meV. Apparently, this mode is not affected by size effects. The existence of the [110]TA(1) phonon mode is a prerequisite for the persistence of Invar-related effects in Fe(3)Pt NCs. Important thermodynamic properties of the NCs are derived, such as the vibrational entropy per atom.