Assistant Research Professor
at IIT / Argonne National Laboratory (Chicago)
- Ph.D. in Materials Science,
University of Pierre & Marie CURIE (France)
- My research focuses on study of structural and electrochemical properties of Li-ion battery materials by electron microscopy: in-situ SEM, in-situ liquid TEM, FIB-SEM tomography, STEM.
Email : email@example.com
Website(French) : www.nanosciences.biz
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3D Quantitative Analysis of Platinum Nanocrystals Superlattices by Electron Tomography
I. Florea, A. Demortière, C. Petit, H. Bulou, C. Hirlimann, O. Ersen, ACS Nano, 2012, 6 (3), pp 2574–2581.
The work reported herein focuses on the 3D relative arrangement of individual platinum nanocrystals with a size of about 5 nm, and on the structure of the superlattices, they spontaneously form. Electron tomography was systematically used in this study because it allows obtaining quantitative 3D information in real space. Performing tomography in the bright-field TEM mode allowed investigating the short and long-range orderings of the nanoparticles packed as self-organized supercrystals. Systematic fcc pilings were observed with a mean lattice parameter measured to be 19.5 nm, the nature of the arrangement being controlled by the truncated octahedral morphology of platinum nanocrystals and the associated steric effects. A numerical 3D quantitative analysis of the ordering characteristics of the superlattice with a nanometer resolution has been performed that, for the first time, showed a direct correlation between single entities’ characteristics and their ordering in periodic arrays. It has been shown that the lattice parameter is different in two orthogonal directions of the fcc structure, which indicates the presence of a slightly compressed superlattice. Inside the superstructure, vacancies and axial defects were observed that would blur the occurrence of potential collective effects from the supercrystals.
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