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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Unveiling Oxygen Adsorption States on One-Dimensional Pt-Induced Nanowires on Ge(001)
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Unveiling Oxygen Adsorption States on One-Dimensional Pt-Induced Nanowires on Ge(001)

机译:在GE(001)上的一维PT诱导纳米线上揭开氧气吸附状态

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Oxygen adsorption on Pt-induced nanowires on Ge(001) (NWs/Ge(001)) was investigated on the atomic scale. At 77 K, we observed two disparate features based on scanning tunneling microscopy images and scanning tunneling spectroscopy measurements. Combining our experimental observations with density functional theory calculation results, we assign the oxygen adsorption states to the physisorption feature between adjacent NW dimers with van der Waals interactions and molecularly chemisorbed species above NW dimers through the formation of peroxy bonds. Detailed analysis reveals that the reactivity of NW atoms toward oxygen adsorption is attributable to the constituent Ge and Pt atoms during gas-solid interfacial reaction: Pt electronic modification renders the dangling bond of the Ge dimer less reactive during oxygen adsorption; and the unbuckled geometry further hinders charge transfer from the Ge NW atom to oxygen. The results will shed light on the fundamental understanding of the oxidation mechanism.
机译:在Pt诱导的纳米线的氧吸附上的Ge(001)(NWS /锗(001))进行了研究在原子尺度上。在77K,我们观察到两种完全不同基于扫描隧道显微镜图像和扫描隧道光谱测量功能。结合我们的实验观察与密度泛函理论计算结果,我们分配氧吸附状态与范德华相互作用和分子化学吸附的物质以上NW二聚体通过的过氧键的形成相邻NW二聚体之间的物理吸附特征。详细分析表明,朝向氧吸附NW原子的反应性气体 - 固体界面反应过程中归因于组成的Ge和Pt原子有:铂电子修改使得在Ge二聚体氧吸附期间较低反应性的悬空键;并且解扣几何进一步阻碍电荷从戈NW原子的氧转移。结果将在氧化机理的基本理解线索。

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