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Journal Article

Polarization-Dependent Sum-Frequency-Generation Spectroscopy for In Situ Tracking of Nanoparticle Morphology

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Unterhalt,  Holger
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Pramhaas, V., Unterhalt, H., Freund, H.-J., & Rupprechter, G. (2023). Polarization-Dependent Sum-Frequency-Generation Spectroscopy for In Situ Tracking of Nanoparticle Morphology. Angewandte Chemie International Edition, 62(19): e202300230. doi:10.1002/anie.202300230.


Cite as: https://hdl.handle.net/21.11116/0000-000D-0CD3-8
Abstract
The surface structure of oxide-supported metal nanoparticles can be determined via characteristic vibrations of adsorbed probe molecules such as CO. Usually, spectroscopic studies focus on peak position and intensity, which are related to binding geometries and number of adsorption sites, respectively. Employing two differently prepared model catalysts, it is demonstrated that polarization-dependent sum-frequency-generation (SFG) spectroscopy reveals the average surface structure and shape of the nanoparticles. SFG results for different particle sizes and morphologies are compared to direct real-space structure analysis by TEM and STM. The described feature of SFG could be used to
monitor particle restructuring in situ and may be a valuable tool for operando catalysis.