Advanced Microscopy for LCC
In collaboration with Electron Microscopy Group
In collaboration with the Research Group “Electron Microscopy”, we apply state-of-the-art microscopy techniques to discover the nanoscale properties of Laterally Condensed Catalyst (LCCs). The unique structure of LCCs, deposited on Si <100> wafers, allows precise sample preparation and alignment, enabling high-resolution studies of functional and reactive interfaces.These methods give us unparalleled access to the structure, stability, and dynamics of catalysts at work:
Scanning Electron Microscopy (SEM)
Contributors: Zahra Gheisari and Adnan Hammud
High-resolution SEM imaging reveals the mesoscopic structure of LCC layers. We analyze whether the layers are open or closed prior to reaction and track morphological changes such as dewetting, cracking, or restructuring after catalysis. This provides key insights into the stability and surface evolution of the catalyst.
Focused Ion Beam (FIB) Lamella
Contributor: Adnan Hammud
The FIB lamella technique enables the precise cross-sectional preparation of samples for electron microscopy. This allows us to directly probe the layer–layer interactions and interface stability inside the catalyst. By studying the evolution of buried interfaces during operation, FIB preparation is critical for understanding how structural dynamics impact catalytic performance.
High-Resolution Transmission Electron Microscopy (HRTEM) & In-Situ TEM
Contributors: Dr. Christian Rohner, Dr. Maxime Boniface and Dr. Franz Schmidt
HRTEM provides atomic-scale resolution of catalyst layers and their interfaces. Combined with electron energy loss spectroscopy (EELS) and energy-dispersive X-ray spectroscopy (EDX), it reveals:
- Intermixing of layers at the nanoscale
- Atomic migration from subsurface regions into the bulk
- Alloy formation and structural transformations under reaction conditions
In-situ TEM allows us to track catalysts evolution in real time, bridging the gap between static characterization and dynamic catalytic behavior. This integrated microscopy approach gives us a multiscale view of catalysts, from surface morphology to atomic-scale transformations, allowing us to connect structure, dynamics, and function in sustainable catalysis.
