原子单位
成核
材料科学
叠加断层
纳米材料
氧化物
化学物理
纳米尺度
金属
纳米技术
堆积
催化作用
平面的
钯
透射电子显微镜
纳米结构
高分辨率透射电子显微镜
化学
冶金
复合材料
位错
计算机科学
物理
生物化学
有机化学
量子力学
计算机图形学(图像)
作者
Qi Zhu,Zhiliang Pan,Zhiyu Zhao,Guang Cao,Langli Luo,Chaolun Ni,Hua Wei,Ze Zhang,Frédéric Sansoz,Jiangwei Wang
标识
DOI:10.1038/s41467-020-20876-9
摘要
Abstract Nanoscale materials modified by crystal defects exhibit significantly different behaviours upon chemical reactions such as oxidation, catalysis, lithiation and epitaxial growth. However, unveiling the exact defect-controlled reaction dynamics (e.g. oxidation) at atomic scale remains a challenge for applications. Here, using in situ high-resolution transmission electron microscopy and first-principles calculations, we reveal the dynamics of a general site-selective oxidation behaviour in nanotwinned silver and palladium driven by individual stacking-faults and twin boundaries. The coherent planar defects crossing the surface exhibit the highest oxygen binding energies, leading to preferential nucleation of oxides at these intersections. Planar-fault mediated diffusion of oxygen atoms is shown to catalyse subsequent layer-by-layer inward oxide growth via atomic steps migrating on the oxide-metal interface. These findings provide an atomistic visualization of the complex reaction dynamics controlled by planar defects in metallic nanostructures, which could enable the modification of physiochemical performances in nanomaterials through defect engineering.
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