Seminaires Ipcms

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
Observing imperfection in atomic interfaces for van der Waals heterostructures Aidan. P. Rooney1, Aleksey Kozikov2,3,4, Alexander N. Rudenko5 , Eric Prestat1, Matthew J Hamer2,3,4, Freddie Withers6, Yang Cao2,3,4, Kostya S. Novoselov2,3,4, Mikhail I. Katsnelson5, Roman Gorbachev2,3,4* Sarah J. Haigh1,4* 1. School of Materials, University of Manchester, Manchester M13 9PL, UK 2. Manchester Centre for Mesoscience and Nanotechnology, University of Manchester, Manchester M13 9PL, UK 3. School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, M13 9PL, UK 4. National Graphene Institute, University of Manchester, Manchester M13 9PL, UK 5. Institute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, Netherlands 6. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, Devon, EX4 4SB, UK 1 KEYWORDS: 2D Materials, TMDC, STEM, FIB, Defects. Abstract: Vertically stacked van der Waals heterostructures are a lucrative platform for exploring the rich electronic and optoelectronic phenomena in two-dimensional materials. Their performance will be strongly affected by impurities and defects at the interfaces. Here we present the first systematic study of interfaces in van der Waals heterostructure using cross sectional scanning transmission electron microscope (STEM) imaging. By measuring interlayer separations and comparing these to density functional theory (DFT) calculations we find that pristine interfaces exist between hBN and MoS2 or WS2 for stacks prepared by mechanical exfoliation in air. However, for two technologically important transition metal dichalcogenide (TMDC) systems, MoSe2 and WSe2, our measurement of interlayer separations provide the first evidence for impurity species being trapped at buried interfaces with hBN: interfaces which are flat at the nanometer length scale.
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Article www.acsnano.org Atomic Defects and Doping of Monolayer NbSe2 † ‡ § ∥ ∥ Lan Nguyen, Hannu-Pekka Komsa, Ekaterina Khestanova, Reza J. Kashtiban, Jonathan J. P. Peters, † ∥ ∥ § § Sean Lawlor, Ana M. Sanchez, Jeremy Sloan, Roman V. Gorbachev, Irina V. Grigorieva, ⊥ # ¶ † Arkady V. Krasheninnikov, , , and Sarah J. Haigh*, † § School of Materials and School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom ‡ ¶ COMP Centre of Excellence, Department of Applied Physics, and Department of Applied Physics, Aalto University, P.O. Box 11100, FI-00076 Aalto, Finland ∥ Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom ⊥ Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany # National University of Science and Technology MISiS, Leninskiy Prospekt, Moscow, 119049, Russian Federation *S Supporting Information ABSTRACT: We have investigated the structure of atomic defects within monolayer NbSe2 encapsulated in graphene by combining atomic resolution transmission electron microscope imaging, density functional theory (DFT) calculations, and strain mapping using geometric phase analysis. We demonstrate the presence of stable Nb and Se monovacancies in monolayer material and reveal that Se monovacancies are the most frequently observed defects, consistent with DFT calculations of their formation energy. We reveal that adventitious impurities of C, N, and O can substitute into the NbSe2 lattice stabilizing Se divacancies. We further observe evidence of Pt substitution into both Se and Nb vacancy sites. This knowledge of the character and relative frequency of diﬀerent atomic defects provides the potential to better understand and control the unusual electronic and magnetic properties of this exciting two-dimensional material.
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Stream 1: EMAG - 2D Materials 10:00 - 12:00 Tuesday, 6Th July, 2021 Sessions EMAG Conference Session Session Organiser Andy Brown, Sarah Haigh
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Atomic Resolution Imaging of Crbr3 Using Adhesion-Enhanced Grids
Atomic Resolution Imaging of CrBr3 using Adhesion-Enhanced Grids Matthew J. Hamer1,2, David G. Hopkinson2,3, Nick Clark2,3, Mingwei Zhou1,2, Wendong Wang1,2 Yichao Zou3, Daniel J. Kelly2,3, Thomas H. Bointon2, Sarah J. Haigh2,3,**, Roman V. Gorbachev1,2,4,* 1Department of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, M13 9PL, UK 2National Graphene Institute, University of Manchester, Oxford Road, Manchester, M13 9PL, UK 3Department of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL, UK 4Henry Royce Institute, Oxford Road, Manchester, M13 9PL, UK *[email protected], **[email protected] KEYWORDS: Magnetic 2D Materials, TEM, Graphene Encapsulation, Crystal Transfer, Suspended Devices Abstract Suspended specimens of 2D crystals and their heterostructures are required for a range of studies including transmission electron microscopy (TEM), optical transmission experiments and nanomechanical testing. However, investigating the properties of laterally small 2D crystal specimens, including twisted bilayers and air sensitive materials, has been held back by the difficulty of fabricating the necessary clean suspended samples. Here we present a scalable solution which allows clean free-standing specimens to be realized with 100% yield by dry- stamping atomically thin 2D stacks onto a specially developed adhesion-enhanced support grid. Using this new capability, we demonstrate atomic resolution imaging of defect structures in atomically thin CrBr3, a novel magnetic material which degrades in ambient conditions. Introduction The family of 2D materials now includes over a hundred members, many of which have been isolated in monolayer form by mechanical exfoliation1,2, direct chemical growth3,4 or solution- phase processing5.
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Autocorrected Off-Axis Holography of 2D Materials
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Graphene Flakes Present in Either a Liquid Dispersion Or Powder Form
The National Physical Laboratory (NPL) NPL is the UK’s National Measurement Institute, and is a world-leading centre of excellence in developing and applying the most accurate measurement standards, science and technology available. NPL's mission is to provide the measurement capability that underpins the UK's prosperity and quality of life. © NPL Management Limited, 2017 Version 1.0 NPL Authors and Contributors Dr Andrew J Pollard Dr Keith R. Paton Dr Charles A. Clifford Ms Elizabeth Legge Find out more about NPL measurement training at www.npl.co.uk/training or our e-learning Training Programme at www.npl.co.uk/e-learning National Physical Laboratory Telephone: +44 (0)20 8977 3222 Hampton Road e-mail: [email protected] Teddington www.npl.co.uk Middlesex TW11 0LW United Kingdom 2 The National Graphene Institute (NGI) at the University of Manchester The £61m National Graphene Institute (NGI) is the world’s leading centre of graphene research and commercialisation. Opened in March 2015, it is not only home to graphene scientists from The University of Manchester but also from across the UK, partnering with leading commercial organisations interested in producing the applications of the future. Currently the NGI has more than 40 industrial partners, working on a range of applications across a wide variety of disciplines. With 7,800 square metres of collaborative research facilities and 1,500 square metres of cleanroom space, the NGI is the largest academic space of its kind in the world for dedicated graphene research. The NGI is funded by £38m from the Engineering and Physical Sciences Research Council (EPSRC) and £23m from the European Regional Development Fund.
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NEWSLETTER January 2018
NEWSLETTER January 2018 Bright Field-STEM image of porosity in a beta-zeolite (FEI Titan Themis G2 300 image courtesy of James Cattle, PhD Student, University of Leeds. Sample provided by Dr Stig Helveg, Haldor Topsoe A/S). See http://emag.iop.org for further details EMAG Group newsletter Jan 2018 CONTENTS EMAG COMMITTEE 3 LETTER FROM THE CHAIR 4 FORTHCOMING EVENTS 5 EMAG 2018 CALL FOR PAPERS 5 EMAG ANNUAL GENERAL MEETING 2018 6 NEWS 7 PROF. PRATIBHA GAI DBE 7 UNIVERSITY OF GLASGOW PLASMA-FIB 8 ELECTRON MICROSCOPY AT DARESBURY LABS 10 MEETING REPORTS 11 MSM-XX, OXFORD 11 VISION AND OPHTHALMOLOGY, BALTIMORE 12 MMC17, MANCHESTER 14 M&M, ST LOUIS 15 APPLY FOR IOP RESEARCH STUDENTS CONFERENCE FUND 15 EMS MEMBERSHIP 16 ADDITIONAL FUTURE MEETINGS OF INTEREST 17 2 EMAG Group newsletter Jan 2018 EMAG COMMITTEE Chair Dr Sarah Haigh School of Materials, University of Manchester, Manchester, M13 9PL Tel: 0161 306 3618 Email: [email protected] Secretary & Honorary Treasurer Dr Andy Brown School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT Tel: 0113 343 2382 Email: [email protected] Ordinary Members Dr ZiYou Li, University of Birmingham, [email protected] Dr Ana Sanchez, University of Warwick, [email protected] Dr Cornelia Rodenburg, University of Sheffield, [email protected] Dr Larry Stoter, Retired, [email protected] Mr Michael Dixon, Hitachi Europe, [email protected] Prof Jun Yuan, University of York, [email protected] Dr Donald MacLaren, University of Glasgow, [email protected] Dr Sarah Karimi, JEOL Ltd, [email protected] Co-opted Dr.
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Nanometer Resolution Elemental Mapping in Graphene-Based TEM
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