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Metals are prone to oxidation, which often results in significant changes to optical, electronic, chemical and mechanical properties in bulk systems. Nanoparticles are no exception in this respect, but a holistic understanding of the mechanisms governing their oxidation is lacking.
During this webinar, Dr. Sara Nilsson and Dr. Shima Kadkhodazadeh will present their recent research in which they used the DENSsolutions Wildfire system to capture the in situ oxidation of single Cu nanoparticles to unravel a sequential competitive activation of different oxidation mechanisms at temperatures between 50 and 200 °C. Using environmental scanning transmission electron microscopy (STEM), they were able to reveal the morphological evolution of oxide formation in detail and identify the formation of multiple oxide layers separated by a vacancy gap.
Moreover, they will demonstrate the use of in situ electron energy-loss spectroscopy (EELS) to map the plasmonic response of individual particles induced by oxidation, and reveal generic geometrical pathways for nanoscale Kirkendall void nucleation and growth that are driven by surface energy minimization. Based on these insights, the researchers were able to uncover the mechanistic pathway of Cu nanoparticle oxidation.
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