Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 3: Microscopy and Tomography with X-ray, Photons, Electrons, Ions and Positrons

KFM 3.4: Vortrag

Montag, 5. September 2022, 10:30–10:50, H7

Stereo X-Ray Microscopy: Seeing the nanocosm in 3D — •Sina Röper1,2, Karolina Stachnik2, Lukas Grote2, Mattias Åstrand3, Hanna Ohlin3, Martin Seyrich1, Sarah-Alexandra Hussak2, Thomas Frisk3, Andreas Schropp1, Ulrich Vogt3, Dorota Koziej2, and Christian Schroer1,21Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 2University of Hamburg, Hamburg, Germany — 3KTH Royal Institute of Technology, Stockholm, Sweden

Understanding the nucleation and growth mechanisms involved in the synthesis of nanomaterials is a key factor in determining their performance and functionality. In many cases, these processes are still not well understood in particular, due to the difficulty of observing them in situ or operando. Scanning hard X-ray microscopy offers the potential for in situ nanoimaging of complex chemical systems under relevant environmental conditions. However, standard X-ray tomography relies on the rotation of the sample with respect to the X-ray beam. This is typically not possible for the synthesis of nanoparticles in solution, which requires an extended reaction cell.

We have developed a new stereoscopic X-ray imaging technique with improved depth resolution to overcome these challenges. By simultaneously illuminating the sample with two nanofocused X-rays at different angles, we increased the effective numerical aperture and improved the spatial resolution along the X-ray beam path. This provides a significant gain in depth-sensitivity in ptychography with multi-slicing and allows us to obtain 3D structural information from 2D scans.

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