Surface differences of oxide nanocrystals determined by geometry and exogenously coordinated water molecules.
Surface differences of oxide nanocrystals determined by geometry and exogenously coordinated water molecules.
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氧化物纳米晶体的表面差异由几何形状和外源水分分子确定。
DOI:
10.1039/d2sc03885d
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发表时间:
2022-09-28
期刊:
影响因子:
8.4
通讯作者:
中科院分区:
文献类型:
--
作者:
Determining the different surfaces of oxide nanocrystals is key in developing structure–property relations. In many cases, only surface geometry is considered while ignoring the influence of surroundings, such as ubiquitous water on the surface. Here we apply 17O solid-state NMR spectroscopy to explore the facet differences of morphology-controlled ceria nanocrystals considering both geometry and water adsorption. Tri-coordinated oxygen ions at the 1st layer of ceria (111), (110), and (100) facets exhibit distinct 17O NMR shifts at dry surfaces while these 17O NMR parameters vary in the presence of water, indicating its non-negligible effects on the oxide surface. Thus, the interaction between water and oxide surfaces and its impact on the chemical environment should be considered in future studies, and solid-state NMR spectroscopy is a sensitive approach for obtaining such information. The work provides new insights into elucidating the surface chemistry of oxide nanomaterials. Both atomic geometry and the influence of surroundings (e.g., exogenously coordinated water) are key issues for determining the chemical environment of oxide surfaces, whereas the latter is usually ignored and should be considered in future studies.
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