Environmental TEM in the In Situ Toolbox for Materials Science

Nanotalks with Prof. Jakob Wagner from the Technical University of Denmark

Timeline

1) Introduction (1:06)
2) Environmental Transmission Electron Microscope Design (7:04)
3) Solid Oxide Fuel Cells – Failure Analysis of Anode (10:56)

4) Copper Oxide Nanowires- Anisotropic Oxidation (17:34)
5) Fast Electron – Gas interaction – Next Steps in Quantitative ETEM (24:06)
6) Graphene – Planar Growth of Carbon Layers (33:59)

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Prof. Jakob B. Wagner

Professor, Scientific Director

Technical University of Denmark | Centre for Electron Nanoscopy Topic | Environmental TEM in the In Situ Toolbox for Materials Science

Email: jakob.wagner@cen.dtu.dk
Website: www.dtu.dk

Abstract

Environmental TEM in the In Situ Toolbox for Materials Science

Jakob B. Wagner, Jens Kling, Christian D. Damsgaard & Thomas W. Hansen | Technical University of Denmark Transmission electron microscopy (TEM) has been instrumental in understanding fundamental properties of nanostructured materials, from heterogeneous catalysts for speeding up chemistry to nanowires for efficient lighting with LEDs and to graphene proposed as the new revolution in semiconducting devices to name but a few. Investigating properties of these materials is facilitated by state-of-the-art instrumentation and development of new techniques within the microscope. Advanced techniques within the TEM framework such as electron holography and environmental TEM (ETEM) gives an extra dimension of the characterization and thereby understanding of nanostructured materials in various environments. The increasing use of particularly ETEM in materials science provides exciting new possibilities for investigating chemical reactions. Careful experimentation can provide input for the development of new generations of catalysts and photocatalysts for e.g. energy production. In order to design experiments with the highest chance of a successful outcome, a detailed understanding of both the interaction of fast electrons with gas molecules, the effect of the presence of gas on high-resolution imaging and the behavior in this environment is necessary. If data is to be interpreted quantitatively, interaction of the primary electrons with gas molecules must be taken into account. Whereas conventional TEM samples are usually thin (below 10-20 nm), the dilute gas in the environmental cell fills the entire gap between the pole pieces and is thus not spatially localized. In this Nanotalks episode, Prof. Wagner will provide examples of in-situ characterization of the dynamical response of nanostructured materials to various gaseous environments and elevated temperature. Furthermore, he will discuss the influence of the interaction between the swift electron and the gas molecules present in the microscope during ETEM experiments.

Recent Publications

2016

Visualizing the mobility of silver during catalytic soot oxidation Gardini, Diego ; Christensen, Jakob Munkholt ; Damsgaard, Christian Danvad ; Jensen, Anker Degn ; Wagner, Jakob Birkedal in journal: Applied Catalysis B: Environmental (ISSN: 0926-3373) (DOI: http://dx.doi.org/10.1016/j.apcatb.2015.10.029), vol: 183, pages: 28-36, 2016

Radial Nanowire Light-Emitting Diodes in the (AlxGa1-x)yIn1-yP Material System Berg, Alexander ; Yazdi, Sadegh ; Nowzari, Ali ; Storm, Kristian ; Jain, Vishal ; Vainorius, Neimantas ; Samuelson, Lars ; Wagner, Jakob Birkedal ; Borgström, Magnus T in journal: Nano Letters (ISSN: 1530-6984) (DOI: http://dx.doi.org/10.1021/acs.nanolett.5b04401), vol: 16, issue: 1, pages: 656-62, 2016

In Situ Ptychography of Heterogeneous Catalysts using Hard X-Rays Baier, Sina ; Damsgaard, Christian Danvad ; Scholz, Maria ; Benzi, Federico ; Rochet, Amélie ; Hoppe, Robert ; Scherer, Torsten ; Shi, Junjie ; Wittstock, Arne ; Weinhausen, Britta ; Wagner, Jakob Birkedal ; Schroer, Christian G. ; Grunwaldt, Jan-Dierk in journal: Microscopy and Microanalysis (ISSN: 1431-9276) (DOI: http://dx.doi.org/10.1017/S1431927615015573), vol: 22, issue: 1, pages: 178-88, 2016

Stable amorphous georgeite as a precursor to a high-activity catalyst Kondrat, Simon A. ; Smith, Paul J. ; Wells, Peter P. ; Chater, Philip A. ; Carter, James H. ; Morgan, David J. ; Fiordaliso, Elisabetta Maria ; Wagner, Jakob Birkedal ; Davies, Thomas E. ; Lu, Li ; Bartley, Jonathan K. ; Taylor, Stuart H. ; Spencer, Michael S. ; Kiely, Christopher J. ; Kelly, Gordon J. ; Park, Colin W. ; Rosseinsky, Matthew J. ; Hutchings, Graham J. in journal: Nature (ISSN: 0028-0836) (DOI: http://dx.doi.org/10.1038/nature16935), vol: 531, issue: 7592, pages: 83-87, 2016

2015

Environmental TEM study of the dynamic nanoscaled morphology of NiO/YSZ during reduction Simonsen, Søren Bredmose ; Agersted, Karsten ; Hansen, Karin Vels ; Jacobsen, Torben ; Wagner, Jakob Birkedal ; Hansen, Thomas Willum ;Kuhn, Luise Theil in journal: Applied Catalysis A: General (ISSN: 0926-860X) (DOI: http://dx.doi.org/10.1016/j.apcata.2014.10.045), vol: 489, pages: 147–154, 2015

Modeling of temperature profiles in an environmental transmission electron microscope using computational fluid dynamics Mortensen, Peter Mølgaard ; Jensen, Anker Degn ; Hansen, Thomas Willum ; Wagner, Jakob Birkedal in journal: Ultramicroscopy (ISSN: 0304-3991) (DOI: http://dx.doi.org/10.1016/j.ultramic.2014.12.007), vol: 152, pages: 1-9, 2015

Environmental TEM Study of Electron Beam Induced Electrochemistry of Pr0.64Ca0.36MnO3 Catalysts for Oxygen Evolution Mildner, Stephanie ; Beleggia, Marco ; Mierwaldt, Daniel ; Hansen, Thomas Willum ; Wagner, Jakob Birkedal ; Yazdi, Sadegh ; Kasama, Takeshi ; Ciston, Jim ; Zhu, Yimei ; Jooss, Christian in journal: The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter (ISSN: 1932-7447) (DOI: http://dx.doi.org/10.1021/jp511628c), vol: 119, issue: 10, pages: 5301-5310, 2015

Structure and Stability of Pt-Y Alloy Particles for Oxygen Reduction Studied by Electron Microscopy Deiana, Davide (Invited author) ; Wagner, Jakob Birkedal (Invited author) ; Hansen, Thomas Willum (Invited author) in journal: E C S Transactions (ISSN: 1938-5862) (DOI: http://dx.doi.org/10.1149/06602.0115ecst), vol: 66, issue: 2, pages: 115-127, 2015 Presented at: 227th ECS Meeting , 2015, Chicago, IL

Structure and Stability of Pt-Y Alloy Particles for Oxygen Reduction Studied by Electron Microscopy Deiana, Davide (Invited author) ; Wagner, Jakob Birkedal (Invited author) ; Hansen, Thomas Willum (Invited author) in journal: Electrochemical Society. Meeting Abstracts (Online) (ISSN: 2151-2043) (DOI: http://dx.doi.org/10.1149/06602.0115ecst), vol: MA2015-01, 2015 Presented at: 227th ECS Meeting , 2015, Chicago, IL

Hysteresis-free nanoplasmonic pd-au alloy hydrogen sensors Wadell, Carl ; Nugroho, Ferry Anggoro Ardy ; Lidström, Emil ; Iandolo, Beniamino ; Wagner, Jakob Birkedal ; Langhammer, Christoph in journal: Nano Letters (ISSN: 1530-6984) (DOI: http://dx.doi.org/10.1021/acs.nanolett.5b01053), vol: 15, issue: 5, pages: 3563-3570, 2015

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