Chen Junchao, Wu Xin-Ping, Hope Michael A, Lin Zhiye, Zhu Lei, Wen Yujie, Zhang Yixiao, Qin Tian, Wang Jia, Liu Tao, Xia Xifeng, Wu Di, Gong Xue-Qing, Tang Weiping, Ding Weiping, Liu Xi, Chen Liwei, Grey Clare P, Peng Luming
Key Laboratory of Mesoscopic Chemistry of MOE, Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University 163 Xianlin Road Nanjing 210023 China
School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, In situ Center for Physical Sciences, Shanghai Jiao Tong University Shanghai 200240 China.
Chem Sci. 2022 Sep 14;13(37):11083-11090. doi: 10.1039/d2sc03885d. eCollection 2022 Sep 28.
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 O 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 1 layer of ceria (111), (110), and (100) facets exhibit distinct O NMR shifts at dry surfaces while these O 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.
确定氧化物纳米晶体的不同表面是建立结构-性能关系的关键。在许多情况下，只考虑表面几何形状，而忽略了周围环境的影响，比如表面普遍存在的水。在这里，我们应用氧固体核磁共振光谱来探究形态可控的氧化铈纳米晶体的晶面差异，同时考虑几何形状和水吸附情况。氧化铈（111）、（110）和（100）晶面第一层的三配位氧离子在干燥表面呈现出不同的氧核磁共振位移，而这些氧核磁共振参数在有水存在时会发生变化，这表明水对氧化物表面有不可忽略的影响。因此，未来的研究应考虑水与氧化物表面之间的相互作用及其对化学环境的影响，而固体核磁共振光谱是获取此类信息的一种灵敏方法。这项工作为阐明氧化物纳米材料的表面化学提供了新的见解。
