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Le SUPER TEM

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Le développement récent des correcteurs d’aberration et des sources d’électrons très cohérentes a renforcé l’impact de la microscopie électronique sur la caractérisation de la matière à l’échelle atomique. En effet, la dernière génération d’instruments corrigés des aberrations permet d’atteindre des résolutions spatiales inférieures à l’angström et des résolutions en énergie de l’ordre du dixième d’électron volt.
La microscopie analytique et l’imagerie à haute résolution ont toutes deux grandement bénéficié des avancées technologiques récentes en microscopie, permettant d’améliorer substantiellement les analyses structurales et chimiques des nanomatériaux. Nous décrivons ici les performances et les principaux résultats du Super TEM : un microscope JEOL ARM 80 - 200 kV, équipé d’une source FEG froide et d’un correcteur d’aberration de la lentille objectif. Le Super TEM, premier instrument au monde dans cette configuration, a été installé en Septembre 2011 à l’Université Paris Diderot. En 2014, nous avons mis en place sur le super TEM des porte-objets environnementaux à base de cellules à membranes étanches, offrant des perspectives sans précédent pour étudier, à l’échelle atomique, les nanomatériaux dans leurs milieux d’applications, liquides ou gazeux.
Cette nouvelle génération d’instrument in situ est ouverte à la communauté scientifique à travers la plate-forme de microscopie avancée de l’Université Paris Diderot et le réseau national METSA.

Voir les publications du SUPER TEM

GALLERY OF RESULTS


Monitoring the oxidative transformations of carbon nanotubes as a guideline for understanding their biodegradation in macrophages

Degradation of a multi-walled carbon nanotube (MWCNT) induced by hydroxyl radicals studied at the nanoscale by using liquid STEM imaging. Iron-oxide nanoparticles encapsulated inside the MWCNT are liberated after the rupture of the tubes, illustrating the potential of biodegradable MWCNTs for drug delivery applications.

Carbon Nanotube Degradation in Macrophages : Live Nanoscale Monitoring and Understanding of Biological Pathway
Dan Elgrabli, Walid Dachraoui, Cécilia Ménard-Moyon, Xiao Jie Liu, Dominique Bégin, Sylvie Bégin-Colin, Alberto Bianco, Florence Gazeau, and Damien Alloyeau
ACS Nano, DOI : 10.1021/acsnano.5b03708


Following the growth mechanisms of gold nanoplates in liquid

In situ liquid STEM characterization of the growth of 2D gold nanoparticles

Unravelling Kinetic and Thermodynamic Effects on the Growth of Gold Nanoplates by Liquid Transmission Electron Microscopy
Damien Alloyeau, Walid Dachraoui, Yasir Javed, Hannen Belkahla, Guillaume Wang, Hélène Lecoq, Souad Ammar, Ovidiu Ersen, Andreas Wisnet, Florence Gazeau, and Christian Ricolleau
Nano Letters 15, 2574−2581


Growth of Cu nanorods

3D structural analysis of Cu Nanorods with a 2-fold symmetry by using electron tomography and diffraction

Original Anisotropic Growth Mode of Copper Nanorods by Vapor Phase Deposition
H Prunier, C Ricolleau, J Nelayah, G Wang, D Alloyeau
Crystal Growth & Design 14 (12), 6350-6356


Discovering a new phase diagram in AuPd nanoalloys

Ultra HRTEM images of L10 Au–Pd nanoparticles

Long-range chemical orders in Au–Pd nanoparticles revealed by aberration-corrected electron microscopy
J Nelayah, NT Nguyen, D Alloyeau, GY Wang, C Ricolleau
Nanoscale 6 (17), 10423-10430


Monitoring at high resolution the biodegradation of iron oxyde nanocubes in vivo

High resolution electron microscopy follow-up of the degradation of iron oxide nanocubes in intracellular lysosomes extracted from the spleen of mice 14 days after in vivo injection (left picture). The structural analysis on the right picture allows identifying the atomic structure of the injected nanocubes (white frame) and the ferritin protein (red frame)

Biodegradation of iron oxide nanocubes : high-resolution in situ monitoring
Lénaic Lartigue, Damien Alloyeau, Jelena Kolosnjaj-Tabi, Yasir Javed, Pablo Guardia, Andreas Riedinger, Christine Péchoux, Teresa Pellegrino, Claire Wilhelm, Florence Gazeau
ACS nano 7 (5), 3939-3952


Gold nanoshield against the biodegradation of magnetic nanoparticles

Bragg filltered high resolution images of iron oxide NFs (in red) covered by a gold
layer (in green) deposited by PLD technique. The nominal thickness of the gold layer is (a) 3 nm, isolated cluster are formed, (b) 5 nm, a percolated fi lm is formed and (c) 7 nm, acontinuous layer is formed.

Biodegradation Mechanisms of Iron Oxide Monocrystalline Nanoflowers and Tunable Shield Effect of Gold Coating
Yasir Javed, Lénaic Lartigue, Pierre Hugounenq, Quoc Lam Vuong, Yves Gossuin, Rana Bazzi, Claire Wilhelm, Christian Ricolleau, Florence Gazeau, Damien Alloyeau
Small


Detection and chemical analysis of single atoms diffusing on a surface using aberration corrected HRTEM


HRTEM images of CoPt nanoparticles. Individual Co and Pt atoms coming from beam induced Ostwald ripening, appear as additional black contrast on the carbon substrate. Signal to noise ratio (SNR) measured between the two corresponding arrows in the HRTEM image for both Co and Pt atoms : (1) SNR profile showing two Co atoms (SNR of –2.32). (2-3) SNR profiles showing one Pt atom (SNR of –3.59).

Following Ostwald ripening in nanoalloys by high-resolution imaging with single-atom chemical sensitivity
D. Alloyeau, T. Oikawa, J. Nelayah, G. Wang, C. Ricolleau
Applied Physics Letters. 101, 121920


Aberration-corrected HRTEM study of the structural properties of N-doped graphene


HRTEM Image of single layer graphene acquired at 80 kV.
Work in progress


Determination of the iron valence state in iron oxide nanostructures by EELS fine structure


Comparison of (a) the Fe L2,3-edge and (b) the O K-edge electron energy-loss near-edge structures of a-Fe2O3 (plain lines) and FeO (black dots). The pre-edge background for each edge has been subtracted using a power-law function. The contribution from transitions to the continuum states has not been removed.

Performances of an 80 – 200 kV microscope employing a cold-FEG and an aberration-corrected objective lens
C. Ricolleau, J. Nelayah, T. Oikawa, Y. Kohno, N. Braidy, G. Wang, F. Hue and D. Alloyeau
Journal of Electron Microscopy doi : 10.1093/jmicro/dfs072


Mapping of surface plasmon resonance in nanoalloys


(a) HAADF image of a dimer of Au3Cu nanocubes. The red dots indicate five distinct positions at which spatially-resolved EEL spectra were acquired on the dimer (b) Comparison of the five spectra acquired at the positions indicated in (a). The energy resolution of the microscope allows us to detect the hybridized surface plasmon resonances associated to the interparticles interactions.

High resolution imaging and spectroscopy using Cs corrected TEM with cold FEG JEM-ARM 200F
C. Ricolleau, J. Nelayah, T. Oikawa, Y. Kohno, N. Braidy, G. Wang, F. Hue and D. Alloyeau
Jeol News, 47, 2-8


Magneto-structural studies of iron-oxide nanoflowers


Three-dimensional analysis of the Multi-Cores maghemite nanoparticles by bright-field TEM tomography. Bright-field
images acquired with a tilt angle of (A) -60, (B) 0, and (C) -60-. (D) Three-dimensional representation of the particles
(tomogram). Two-dimensional slices extracted from the tomogram : (E) 2D slice parallel to the substrate, corresponding to the
blue (x,y) plane in the 3D representation ; (F) 2D slice perpendicular to the substrate, corresponding to the blue (y,z) plane in
the 3D representation.

Cooperative Organization in Iron Oxide Multi-Core Nanoparticles Potentiates their Efficiency as Heating Mediators and MRI Contrast Agents
Lenaic Lartigue, Pierre Hugounenq, Damien Alloyeau, Sarah P Clarke, Michael Levy, Jean-Claude Bacri, Rana Bazzi, Dermot F Brougham, Claire Wilhelm, Florence Gazeau
ACS Nano 6, 10935


Spatial and energy resolutions


(a) Measured zero-loss peaks in various emission current (IE) conditions measured at 200 kV. The energy spread was defined by
FWHM of the zero-loss peak. (b) Energy spread as a function of emission current measured at 200 kV (red and 80 kV (blue).


(a) Young’s fringes pattern obtained at 200 kV showing a point resolution of 75 pm. (b) Fast fourier transformation of a
high-resolution image obtained at 200 kV on a (100) gold single crystal. The observation of the [048] peak of the gold crystal highlights that
the lattice resolution of the microscope is below 50 pm (d048 = 0.046 nm). (c) Young’s fringes pattern obtained at 80 kV showing a point
resolution of 80 pm.

Performances of an 80 – 200 kV microscope employing a cold-FEG and an aberration-corrected objective lens
C. Ricolleau, J. Nelayah, T. Oikawa, Y. Kohno, N. Braidy, G. Wang, F. Hue and D. Alloyeau
Journal of Electron Microscopy doi : 10.1093/jmicro/dfs072