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Article

Catégorie : Evénements scientifiques

Lundi 8 octobre 2018 : Séminaire de Thierry EPICIER : Towards operando and real time 3D analysis of nanomaterials in environmental TEM

Dans le cadre des séminaires du Département Chimie et Physique des Solides et des Surfaces (CP2S), l'Institut Jean Lamour reçoit Thierry EPICIER (MATEIS - Lyon) pour un séminaire sur le thème :

"Towards operando and real time 3D analysis of nanomaterials in environmental TEM"

 

Date et lieu :
Lundi 8 octobre 2018 à 14h00
Campus Artem, Nancy
Amphithéâtre 200

 

Résumé :

In the last decade, 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 [1,2], enabling today to follow a chemical reaction under gas and in temperature down to the atomic level. Doing so, one of the scientific locks to be lifted is the temporal resolution required to follow the dynamic of the process to be studied. Another challenging topic is the need for 3D information during the evolution of the object when exposed to reactive conditions and more ambitiously, mechanical stimuli.

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. In most of experiments, a
Wildfire heating-holder (DENSsolutions) was used with 1300°C compatible Si/SiNx nanochips. Its
high tilting capability of ± 72° allows in situ nano-tomography. A high speed Oneview camera from
Gatan capable of acquisition rates at several hundreds of frames per second (100 fps in 2K) allows
fast ‘tilting’ tomography at the minute and even second level [3], which opens the way to
quantitative 3D kinetics studies of nanocatalysts under operando conditions.

Illustrated works concern:
- The oxidation of soot by YSZ catalysts in the context of Diesel motors depollution [4]
- A quantitative atomic mobility at {100} surfaces of ceria (cerium dioxide CeO2) nanocubes
under different atmospheres [5].
During this presentation, attention will be paid to the influence of the electron beam on the
observed processes (irradiation effects). Some clues will be discussed regarding the development of
routine ‘5-10 seconds’ fast operando nanotomography in the ETEM. Big data issues (regarding
storage andimage processing) will also be evoked [6].


References :

[1] J. Jinschek, Chem. Commun., 50 (2014), 2696-2706; E.D. Boyes, P. Gai, C. R. Physique 15 (2014), 200-213; P.A. Crozier, T.W.
Hansen, MRS Bull. 40 (2015), 38-45; S Takeda, Y Kuwauchi, H Yoshida, Ultramicroscopy 151 (2015), 178-190.
[2] "ControlledAtmosphere Transmission Electron Microscopy", ed. T.W. Hansen, J.B. Wagner (Springer, New York), (2016), 332 p.
[3] L. Roiban, S. Li, M. Aouine, A. Tuel, D. Farrusseng, T. Epicier, J. of Microscopy 269, 2 (2018), 117-126.
[4] A. Serve, T. Epicier, M. Aouine, F.J. Cadete Santos Aires, E. Obeid, M. Tsampas, K. Pajot, P. Vernoux, Appl. Catal. A, 504 (2015) 74-
80.
[5] M. Bugnet, S. H. Overbury, Z. Wu, T. Epicier, Nano Letters, 17 12 (2017), 7652-7658.
[6] This presentation is largely based on ongoing projects involving several colleagues at Univ. Lyon: S. Koneti, L. Roiban, M. Bugnet, L.
Joly-Pottuz, K. Masenelli-Varlot from MATEIS, INSA-Lyon; M. Aouine, F.C. Santos Aires, P. Vernoux, D. Lopez-Gonzalez from
IRCELYON, UCBL; T. Grenier, H. Banjak, V. Maxim from CREATIS, INSA-Lyon. The support of ANR through the project 3DCLEAN n°15-
CE09-0009-01 is gratefully acknowledged. Thanks are due to CLYM (www.clym.fr) for the access to the Environmental microscope which
was funded through a CPER project 2007-2013 associating the Rhône-Alpes region, the ‘Great Lyon’ and the CNRS.