Anomalous versus Normal Room-Temperature Diffusion of Metal Adatoms on Graphene
| Autor: | Víctor Gervilla, Kostas Sarakinos, Mohammad Zarshenas, Davide Sangiovanni |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Fysikalisk kemi
Fabrication Materials science Letter Condensed matter physics Graphene Heterojunction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Physical Chemistry 0104 chemical sciences law.invention Metal Condensed Matter::Materials Science Diffusion dynamics law visual_art visual_art.visual_art_medium General Materials Science Physical and Theoretical Chemistry Diffusion (business) 0210 nano-technology |
| Zdroj: | The Journal of Physical Chemistry Letters |
| ISSN: | 1948-7185 |
| Popis: | Fabrication of high-performance heterostructure devices requires fundamental understanding of the diffusion dynamics of metal species on 2D materials. Here, we investigate the room-temperature diffusion of Ag, Au, Cu, Pd, Pt, and Ru adatoms on graphene using ab initio and classical molecular dynamics simulations. We find that Ag, Au, Cu, and Pd follow Lévy walks, in which adatoms move continuously within ∼1–4 nm2 domains during ∼0.04 ns timeframes, and they occasionally perform ∼2–4 nm flights across multiple surface adsorption sites. This anomalous diffusion pattern is associated with a flat (100 meV) and, hence, migrate via conventional random walks. Thus, adatom anomalous diffusion is a potentially important aspect for modeling growth of metal films and nanostructures on 2D materials. Funding agencies: Swedish research council (contract VR-2015-04630), ÅForsk foundation (contract ÅF 19-137), Olle Engkvist foundation (contract SOEB 190-312), Swedish Research Council through Grant Agreement No. VR-2015-04630 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|