Chemical Research in Chinese Universities ›› 2010, Vol. 26 ›› Issue (3): 472-478.

• Articles • Previous Articles     Next Articles

First-Principle Studies on Adsorption of Cu+ and Hydrated Cu+ Cations on Clean Si(111) Surface

CHENG Feng-ming1,2, SHENG Yong-li1,3, LI Meng-hua1, LIU Yong-jun1*, YU Zhang-yu1 and LIU Cheng-bu1*   

  1. 1. School of Chemistry and Chemical Engineering,
    2. School of Environmental Science and Engineering, Shandong University, Jinan 250100, P. R. China;
    3. School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China
  • Received:2009-06-08 Revised:2009-09-14 Online:2010-05-25 Published:2010-07-27
  • Contact: LIU Yong-jun. E-mail: yongjunliu_1@sdu.edu.cn; LIU Cheng-bu. E-mail: cbliu@sdu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.20633060).

Abstract:

To study the adsorption behavior of Cu+ in aqueous solution on semiconductor surface, the interactions of Cu+ and hydrated Cu+ cations with the clean Si(111) surface were investigated via hybrid density functional theory(B3LYP) and MΦller-Plesset second-order perturbation(MP2) method. The clean Si(111) surface was described with cluster models(Si14H17, Si16H20 and Si22H21) and a four-silicon layer slab under periodic boundary conditions. Calculation results indicate that the bonding nature of adsorption of Cu+ on Si surface can be viewed as partial covalent as well as ionic bonding. The binding energies between hydrated Cu+ cations and Si(111) surface are large, suggesting a strong interaction between them. The coordination number of Cu+(H2O)n on Si(111) surface was found to be 4. As the number of water molecules is larger than 5, water molecules form a hydrogen bond network. In aqueous solution, Cu+ cations will safely attach to the clean Si(111) surface.

Key words: Silicon surface; Copper; Ion-solid interaction; Adsorption; Density functional calculation