Manipulating the Edge of a Two-Dimensional MgO Nanoisland

Xu, Chaoqiang1; Que, Yande1; Zhuang, Yuan1; Liu, Bin1; Ma, Yaping2; Wang, Kedong2,3; Xiao, Xudong1

2019-08-15

10.1021/acs.jpcc.9b04906

Journal of Physical Chemistry C   影响因子和分区

1932-7447

1932-7455

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/O-2 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.

SCI ; EI

英语

其他

MOST 973 Program[2014CB921402]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000481568900041

AMER CHEMICAL SOC

20193407334686

Electronic properties ; Electrons ; Magnesia ; Metals ; Morphology ; Scanning tunneling microscopy ; Silver compounds ; Substrates ; Surface reactions ; Temperature

Magnesium and Alloys:542.2 ; Thermodynamics:641.1 ; Chemical Reactions:802.2 ; Inorganic Compounds:804.2 ; Materials Science:951

Web of Science

1.Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China
2.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China
3.SUSTech, Shenzhen Key Lab Quantum Sci & Engn, Shenzhen 518055, Peoples R China

Xu, Chaoqiang,Que, Yande,Zhuang, Yuan,et al. Manipulating the Edge of a Two-Dimensional MgO Nanoisland[J]. Journal of Physical Chemistry C,2019,123(32):19619-19624.

Xu, Chaoqiang.,Que, Yande.,Zhuang, Yuan.,Liu, Bin.,Ma, Yaping.,...&Xiao, Xudong.(2019).Manipulating the Edge of a Two-Dimensional MgO Nanoisland.Journal of Physical Chemistry C,123(32),19619-19624.

Xu, Chaoqiang,et al."Manipulating the Edge of a Two-Dimensional MgO Nanoisland".Journal of Physical Chemistry C 123.32(2019):19619-19624.