中国物理B ›› 2011, Vol. 20 ›› Issue (6): 68101-068101.doi: 10.1088/1674-1056/20/6/068101

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Adsorption of sodium ions and hydrated sodium ions on a hydrophobic graphite surface via cation-π interactions

赵纪军1, 石国升2, 王志刚2, 胡钧2, 方海平2   

  1. (1)Laboratory of Material Modification by Laser, Electron and Ion Beams, and the College of Advanced Science and Technology, Dalian University of Technology, Dalian 116024, China; (2)Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • 收稿日期:2010-08-24 修回日期:2010-10-13 出版日期:2011-06-15 发布日期:2011-06-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 10674146 and 10825520), the National Basic Research Program of China (Grant No. 2007CB936000), and the Knowledge Innovation Program of the Chinese Academy of Sciences.

Adsorption of sodium ions and hydrated sodium ions on a hydrophobic graphite surface via cation-$\pi$ interactions

Shi Guo-Sheng(石国升)a), Wang Zhi-Gang(王志刚) a)†, Zhao Ji-Jun(赵纪军)b), Hu Jun(胡钧)a), and Fang Hai-Ping(方海平) a)‡   

  1. a Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China; b Laboratory of Material Modification by Laser, Electron and Ion Beams, and the College of Advanced Science and Technology, Dalian University of Technology, Dalian 116024, China
  • Received:2010-08-24 Revised:2010-10-13 Online:2011-06-15 Published:2011-06-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 10674146 and 10825520), the National Basic Research Program of China (Grant No. 2007CB936000), and the Knowledge Innovation Program of the Chinese Academy of Sciences.

摘要: Using density functional theory computation, we show that sodium ions and hydrated sodium ions can be strongly adsorbed onto a hydrophobic graphite surface via cation-π interactions. The key to this cation-π interaction is the coupling of the delocalized π states of graphite and the empty orbitals of sodium ions. This finding implies that the property of the graphite surface is extremely dependent on the existence of the ions on the surface, suggesting that the hydrophobic property of the graphite surface may be affected by the existence of the sodium ions.

关键词: graphite, sodium ion and hydrated sodium ion, cation-π interaction, density functional theory

Abstract: Using density functional theory computation, we show that sodium ions and hydrated sodium ions can be strongly adsorbed onto a hydrophobic graphite surface via cation-$\pi$ interactions. The key to this cation-π interaction is the coupling of the delocalized $\pi$ states of graphite and the empty orbitals of sodium ions. This finding implies that the property of the graphite surface is extremely dependent on the existence of the ions on the surface, suggesting that the hydrophobic property of the graphite surface may be affected by the existence of the sodium ions.

Key words: graphite, sodium ion and hydrated sodium ion, cation-$\pi$ interaction, density functional theory

中图分类号:  (Graphite)

  • 81.05.uf
81.15.Hi (Molecular, atomic, ion, and chemical beam epitaxy) 71.15.Mb (Density functional theory, local density approximation, gradient and other corrections)