A DFT study on the mechanical properties of hydrogenated and fluorinated germanene sheets
| Autor: | Sh Yousefi, Shobair Mohammadi Mozvashi, Reza Ansari, M. Goli, P. Aghdasi |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
FOS: Physical sciences Young's modulus 02 engineering and technology Electron 01 natural sciences symbols.namesake Condensed Matter::Materials Science Adsorption 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Materials Science Electrical and Electronic Engineering Physics::Chemical Physics 010302 applied physics Bulk modulus Condensed Matter - Materials Science Germanene Condensed Matter - Mesoscale and Nanoscale Physics Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Condensed Matter Physics Chemical physics Covalent bond symbols Surface modification Density functional theory 0210 nano-technology |
| Popis: | The density functional theory (DFT) is used to investigate the mechanical properties of pure, fully hydrogenated, semi-hydrogenated, fully fluorinated, and semi-fluorinated germanene sheets, including Young's and bulk moduli, and plastic properties. Also, the electronic properties, namely the planar average electron difference density, are considered to evaluate the bonding characteristics of pure and adsorbed germanenes. The results show that the effect of adsorption decreases the electron accumulation between Ge atoms, i.e. weaker covalent bonds. This weakening in the covalent bonds results in the reduction of Young's and bulk moduli, which are calculated through the second derivation of the total energy versus strain. Furthermore, it is observed that the yield strain of fully fluorinated germanene remains unchanged under uniaxial loading as compared to the pristine structure. Moreover, the yield strain of the germanene is increased under biaxial loading, while it is affected by full hydrogenation adsorption. |
| Databáze: | OpenAIRE |
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