Journal
CURRENT APPLIED PHYSICS
Volume 24, Issue -, Pages 39-45Publisher
ELSEVIER
DOI: 10.1016/j.cap.2021.01.009
Keywords
MgO(100); Au dimer; Charging; Ab-initio calculations; Adsorption; Diffusion
Funding
- Global Frontier Program through the Global Frontier Hybrid Interface Materials (GFHIM) of the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning (MSIT) [NRF2013M3A6B1078874]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2020R1A5A6017701]
- BK21PLUS SNU Materials Division for Educating Creative Global Leaders [21A20131912052]
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The adsorption and diffusion properties of charged Au dimers on MgO(100) were investigated using ab-initio calculations, revealing differences compared to charge-neutral dimers. Charged Au dimers showed lower diffusion barrier heights, indicating distinct surface behavior compared to neutral dimers. The electronic properties of the Au dimers were also examined in detail.
By using ab-initio calculations, the adsorption and diffusion properties of charged Au dimers (Au-2(+) and Au-2(0)) on MgO(100) were investigated and compared with those of the charge-neutral dimer (Au-2(0)). The most favored adsorption structure of Au-2(+) on MgO(100) is the upright dimer on a surface O atom in agreement with that of Au-2(0). The surface diffusion of Au-2(+) on MgO(100) occurs by the leapfrog process with a barrier height of 0.38 eV lower than that of Au-2(0) (0.66 eV). The most stable adsorption structure of Au-2(0) on MgO(100) is the flat-lying dimer on two surface Mg atoms. The surface diffusion of Au-2(0) on MgO(100) can proceed by the hopping and walking processes with a barrier height in the range of 0.05?0.11 eV, which is much lower than the diffusion barriers of Au-2(+) and Au-2(0). Furthermore, detailed information on the electronic properties of Au-2(0), Au-2(+), and Au-2(0) are also presented.
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