Calcium intercalation underneath N-layer graphene on 6H-SiC(0001)
| Autor: | Yuxi Zhang, Qiaoyue Chen, Yiliang Cai, Peng Wang, Fang Hu, Hanjie Zhang, Kaikai Huang, Pimo He, Dan Qiao, Jun-Jie Song |
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| Rok vydání: | 2018 |
| Předmět: |
inorganic chemicals
Materials science Graphene Bilayer Doping Intercalation (chemistry) General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology Epitaxy 01 natural sciences law.invention Crystallography law 0103 physical sciences Monolayer Density functional theory Physical and Theoretical Chemistry Scanning tunneling microscope 010306 general physics 0210 nano-technology |
| Zdroj: | Chemical Physics Letters. 703:33-38 |
| ISSN: | 0009-2614 |
| DOI: | 10.1016/j.cplett.2018.05.014 |
| Popis: | Calcium intercalation underneath epitaxial graphene on 6H-SiC(0001) were investigated by scanning tunneling microcopy (STM) and density functional theory (DFT) calculations. After the preparation of calcium-adsorbed graphene on 6H-SiC(0001), annealing the sample to 900 °C activated the intercalation of the adsorbed calcium into buffer layer (BL), monolayer (1L) and bilayer epitaxial (2L) graphene. Subsequent DFT modeling show the dependence of the most stable intercalation sites for calcium underneath BL, 1L and 2L graphene on the intercalation density. Further DFT calculations indicate charge transfer from the intercalant into graphene layers, leading to the n-type doping of the calcium-intercalated BL, 1L and 2L graphene. |
| Databáze: | OpenAIRE |
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