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Communication Dans Un Congrès Année : 2023

Gaseous Environmental Transmission Electron Microscope (ETEM): seeing nanomaterials at work under external stimuli

Résumé

In the last two decades, Environmental Transmission Electron Microscopy (ETEM) has become a new sharp blade of the ‘TEM’ Swiss Army knife for studying materials at the nanoscale in almost operando conditions. Spectacular technological improvements have been made for both dedicated ETEMs and E-cells, enabling today to follow a chemical reaction under gas and in temperature even down to the atomic level. We will survey here several studies related mostly to nanocatalysts and conducted on the 80-300 kV Cs-corrected FEI-TITAN ETEM installed at CLYM in Lyon in 2013: -The oxidation of soot by YSZ catalysts in the context of Diesel motors depollution -The interaction, and influence on atomic mobility of molecules (O2, CO2) with the surfaces of ceria (cerium dioxide CeO2) nanocubes -Various redox reactions involving supported metallic nanoparticles for heterogeneous catalysis Beyond the qualitative description of mechanisms controlling catalytic transformations, some quantitative analyses will be presented on the characterization of population of objects during their dynamic evolution when exposed to environmental conditions: - Unravelling the 3D morphology of nanoparticles by fast in situ ‘tilting’ tomography - Two specific examples of deep learning approaches: the calcination of Pd(O) nanoparticles supported on delta-alumina and the deliquescence of NaCl nanocrystals under wet conditions (H2O vapor) [1]. [1] This presentation is largely based on recent and still ongoing projects involving several colleagues at Univ. Lyon: M. Aouine, F. Cadete Santos Aires, E. Ehret, P. Vernoux (IRCELYON, UCBL), M. Bugnet, S. Koneti, L. Roiban (MATEIS, INSA-Lyon), T. Grenier, H. Banjak (CREATIS, INSA-Lyon). The support of the French National Research Agency (ANR) through projects n°15-CE09-0009-01 and n°20-CE42-0008 is gratefully acknowledged. Thanks are due to CLYM (www.clym.fr, a member of the METSA network - www.metsa.fr -) for the access to the ETEM funded through a CPER project 2007-13 associating the Rhône-Alpes region, the ‘Great Lyon’ and the CNRS.
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Dates et versions

hal-04287870 , version 1 (15-11-2023)

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  • HAL Id : hal-04287870 , version 1

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T. Epicier. Gaseous Environmental Transmission Electron Microscope (ETEM): seeing nanomaterials at work under external stimuli. KBSI: Korea Basic Science Institute 126-16 Center, Seongbuk-gu, Seoul, Sep 2023, Seoul, South Korea. ⟨hal-04287870⟩
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