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First-principles study of electronic properties of interfacial atoms in metal-metal contact electrification |
Zhang Yuan-Yue (张远月), Shao Tian-Min (邵天敏), Su Kang (苏康) |
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China |
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Abstract The mechanism of contact electrification between metals was studied using the first-principles method, taking the Ag-Fe contact as an example. Charge population, charge density difference, and the orbitals and densities of states (DOS) were calculated to study the electronic properties of the contacting interfacial atoms. Based on the calculation, the amount of contact charge was obtained. The investigation revealed that the electrons near Fermi levels with higher energies transfer between the outermost orbitals (s orbitals for Ag and d orbitals for Fe). Meanwhile, polarized covalent bonds form between the d electrons in the deep energy states. These two effects together lead to an increase of charge magnitude at the interface. Also, the electrons responsible for electrification can be determined by their energies and orbitals.
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Received: 22 October 2012
Revised: 07 December 2012
Accepted manuscript online:
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PACS:
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34.70.+e
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(Charge transfer)
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73.40.Jn
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(Metal-to-metal contacts)
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31.15.A-
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(Ab initio calculations)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 50823003 and 90923018). |
Corresponding Authors:
Shao Tian-Min
E-mail: shaotm@tsinghua.edu.cn
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Cite this article:
Zhang Yuan-Yue (张远月), Shao Tian-Min (邵天敏), Su Kang (苏康) First-principles study of electronic properties of interfacial atoms in metal-metal contact electrification 2013 Chin. Phys. B 22 053403
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