Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Institut für Physik

Dr. Walid Hetaba (Max-Planck-Institut für Chemische Energiekonversion, Habilitandenkolloquium),
"Challenges and solutions for electron microscopy in catalysis and materials science"

Abstract:
Analytical transmission electron microscopy (TEM) has become a widely implemented technique in a modern research institute involved in catalysis and materials science. To get the full picture when investigating different materials and their properties, several analytical techniques available in TEM have to be combined and compared with the results of other analytical instruments. However, usually TEM specialists perform the necessary tasks for a thorough microscopical study of the materials of interest. ChemiTEM is a project aimed at generating standard procedures and workflows optimized for non-expert TEM users for applications in material synthesis and chemistry. These workflows were implemented into a tablet app enabling non-expert TEM users to perform even applications they have no previous experience with by guiding them through all necessary decision processes. The app also includes a workflow for data analysis.
In many cases, samples have to be investigated under inert conditions, e.g., when catalysts consist of reduced metals. We developed a new method to perform such investigations without the necessity to use dedicated sample holders but instead being able to harness the capabilities of standard sample holders.
I will present some examples of the interplay of different analytical techniques as well as results of the ChemiTEM project and our inert investigation techniques.

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