Manipulating the Edge of a Two-Dimensional MgO Nanoisland

Manipulating the Edge of a Two-Dimensional MgO Nanoisland
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操纵二维氧化镁纳米岛的边缘

DOI:
10.1021/acs.jpcc.9b04906
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发表时间:
2019-07
影响因子:
3.7
通讯作者:
Xiao Xudong
Xiao Xudong
中科院分区:
化学3区
文献类型:
--
作者:
Xu Chaoqiang;Que Y;e;Zhuang Yuan;Liu Bin;Ma Yaping;Wang Kedong;Xiao Xudong

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我们使用低温扫描隧道显微镜/光谱学 (LT-STM/STS) 和低能电子衍射研究了通过反应沉积方法在 Ag(001) 基底上生长的 MgO 岛的形貌演变和电子特性。通过将 Mg/O2 比率推至富镁极限,我们观察到从非极性边缘到极性边缘的边缘转变,这意味着边缘中的离子排列完全不同。我们将其归因于表面化学反应过程后残留的过量镁原子。残留的 Mg 占据下面 Ag 基底的替代位点,有助于进一步降低表面功函数。更有趣的是,STS 测量揭示了极边 MgO 岛边缘表面态的突然消失。我们的研究提供了一种操纵金属氧化物纳米结构边缘的可靠方法。
We investigate the morphology evolution and electronic properties of MgO islands grown on the Ag(001) substrate by the reactive deposition method using low-temperature scanning tunneling microscopy/spectroscopy (LT-STM/STS) and low-energy electron diffraction. By pushing the Mg/O2 ratio to the Mg-rich limit, we observe an edge transformation from the nonpolar to the polar edge, implying a completely different ion arrangement in the edge. We ascribe it to the excess Mg atoms which remain after this surface chemical reaction process. The residual Mg occupying the substitutional sites of the underlying Ag substrate contributes to the further reduction of the surface work function. More intriguingly, STS measurement reveals the abrupt disappearance of the surface state at the edge of polar-edge MgO islands. Our study provides a reliable approach to manipulate the edges of metal–oxide nanostructures.
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