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INSTITUT DE PHYSIQUE ET CHIMIE DES MATERIAUX DE STRASBOURG 23, rue du Loess – BP 43 67034 STRASBOURG CEDEX 02 03 88 10 71 41 SEMINAIRE IPCMS Vendredi 20 mars 2020 à 15h à l’auditorium « New challenges for scanning transmission electron microscope imaging of nanomaterials : 2D material heterostructures, liquid cells and 3D nanoparticle catalytic chemistry » Prof. Sarah HAIGH Director of the Electron Microscopy Centre Deputy Director of BP ICAM University of Manchester, Department of Materials Contact : Pierre Rabu ([email protected]) Abstract: The properties of nanomaterials are known to be sensitive to their size, shape and elemental distribution. Scanning transmission electron microscopy (STEM) is a powerful tool for investigating the local structure and chemistry of a wide range of different nanomaterials but the technique still has a number of limitations. The first problem is that specimens are usually examined in the microscope’s high vacuum environment. Examining materials under more realistic environmental conditions is highly desirable but usually requires us to sacrifice spatial resolution or elemental analysis capabilities. In this talk I will describe some recent advances in development of in situ analytical STEM including our use of graphene as a perfect electron transparent window [1]. The other common problem with STEM is the potential for damage caused by the electron beam. I will describe a new approach where we have learnt from the Nobel prize winning technique of single particle reconstruction, often applied to biological systems, to yield 3D elemental information for beam sensitive inorganic nanoparticles [2]. Finally I will demonstrate an approach for gaining 3D structural information to investigate local reconstruction in twisted 2D material heterostructures [3]. [1] Kelly et al, Nanometer Resolution Elemental Mapping in Graphene-Based TEM Liquid Cells, Nano Letters, (2018) https://doi.org/10.1021/acs.nanolett.7b04713 [2] Wang et al, Imaging Three-Dimensional Elemental Inhomogeneity in Pt-Ni Nanoparticles Using Spectroscopic Single Particle Reconstruction, Nano Letters (2019) 10.1021/acs.nanolett.8b03768 [3] Weston et al, Atomic reconstruction in twisted bilayers of transition metal dichalcogenides, Nature Nanotechnology, 2020 (in press) Biography: Sarah Haigh is a Professor of Materials Characterisation at the University of Manchester, UK and director of the UK’s largest Electron Microscopy Centre. Her research interests centre on improving our understanding of nanomaterials using transmission electron microscope (TEM) imaging and analysis techniques. She has published over 140 research papers, most in the last 5 years. She completed undergraduate and doctorate degrees in Material Science at the University of Oxford, worked as consultant application specialist to JEOL UK and moved to the University of Manchester in 2010. She was awarded the IoM3 Rosenhain Medal in 2017, the RMS Medal for Innovation in Applied Microscopy in 2016 and the IoM3 Silver award in 2015. .

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Observing Imperfection in Atomic Interfaces for Van Der Waals
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