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Coherent X-Ray diffraction of a single epitaxial nanoparticle



DESY FS-NL (NanoLab)
Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany

DESY is one of the most important accelerator centers of the world. Thanks to collaboration of relevant research groups, the research carried out at DESY is remarkably varied. Our group, DESY NanoLab, is a facility providing access to nano-characterization, nano-structuring and nano-synthesis techniques which are complementary to the advanced X-ray techniques available at DESY’s light sources. One of our main research areas is study and knowledge of catalytic processes.
Heterogeneous catalysis is a chemical process performed at a solid−gas or a solid−liquid interface. The function of a catalyst is to direct a chemical reaction through a new pathway with a lower activation energy barrier. The nanoparticle shape is an influential factor in many catalytic activities because it could dictate the adsorption free energy by the atomic arrangement on the catalyst surface. Understanding how nanometre-sized particles catalyse chemical reactions is important for the development of efficient catalytic materials for a wide range of energy and environmental technologies.
Therefore, in order to understand the size-dependence of catalytic processes, novel approaches to controlled nanocatalysis are required. Tracking the atomic scale structural re-organisation in a catalyst material in-situ during a catalytic process is crucial to identify the catalytically active sites. For this reason we have developed and applied an“advanced nano-object transfer and positioning” protocol to re-localization of pre-selected nano-objects in the nanofocused X-ray beam supporting by the NFFA European Project.
We aim to understand the atomic structure and shape of single nano-object during catalytic CO oxidation under continuous flow at near ambient pressures by in-situ coherent Bragg diffraction using a nano-focused X-ray beam at a 3rd generation synchrotron source.