Polar surface structure of oxide nanocrystals revealed with solid-state NMR spectroscopy.
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Chen, J., Wu, X., Hope, M., Qian, K., Halat, D., Liu, T., Li, Y., et al. (2019). Polar surface structure of oxide nanocrystals revealed with solid-state NMR spectroscopy.. Nature communications, 10 (1), 5420. https://doi.org/10.1038/s41467-019-13424-7
Compared to nanomaterials exposing nonpolar facets, polar-faceted nanocrystals often exhibit unexpected and interesting properties. The electrostatic instability arising from the intrinsic dipole moments of polar facets, however, leads to different surface configurations in many cases, making it challenging to extract detailed structural information and develop structure-property relations. The widely used electron microscopy techniques are limited because the volumes sampled may not be representative, and they provide little chemical bonding information with low contrast of light elements. With ceria nanocubes exposing (100) facets as an example, here we show that the polar surface structure of oxide nanocrystals can be investigated by applying 17O and 1H solid-state NMR spectroscopy and dynamic nuclear polarization, combined with DFT calculations. Both CeO4-termination reconstructions and hydroxyls are present for surface polarity compensation and their concentrations can be quantified. These results open up new possibilities for investigating the structure and properties of oxide nanostructures with polar facets.
National Natural Science Foundation of China (NSFC)−Royal Society Joint Program (21661130149) and NSFC (91745202, 21573103 and 21825301). Programme of Introducing Talents of Discipline to Universities (B16017) The Royal Society and the Newton Fund Priority Academic Program Development of Jiangsu Higher Education Institutions. Oppenheimer foundation. Cambridge International Trust. NECCES, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. DE-SC0012583.
Royal Society (NA150567)
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External DOI: https://doi.org/10.1038/s41467-019-13424-7
This record's URL: https://www.repository.cam.ac.uk/handle/1810/298924
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