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Acta Phys. -Chim. Sin.  2008, Vol. 24 Issue (01): 127-132    DOI: 10.3866/PKU.WHXB20080122
Article     
First-Principle Calculations on the Atomic Geometry and Electronic States of COMonolayer on Cu(001) Surface
ZHAO Xin-Xin; MI Yi-Ming
Science Engineering of Shanghai University, Shanghai 201620, P. R. China
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Abstract  First-principle calculations were performed on the geometric structure and adsorption properties of CO monolayer on Cu(001) surface by using USPP and FLAPWmethods. Relaxed geometry structure suggested that top was the most stable site. The distance between C and Cu atoms was about 0.1868 nm on top site, compared with 0.1975 nm on bridge sites and 0.2231 nm on hollow sites. The bond length of CO molecules on top, bridge and hollow sites were estimated to be 0.1154, 0.1165 and 0.1175 nm, respectively. From the structure of adsorbed surface, it was found that the bond length of COwas enlarged by the nearest copper atoms. PDOS (partial orbital of density of state) of COshowed that the interaction between adsorbent and adsorbate was mainly induced by the hybridization of molecule 5σ orbital and copper 3d orbital. The hybridization was mainly induced by the symmetry of orbital and sites. The result of orbital charge indicated that the s orbital charge of carbons reduced and the p orbital charge of carbons increased, when CO molecules were adsorbed on the top sites. At last, the work functions for three adsorbed surfaces were investigated, which were calculated to be 5.51 eV on top, 6.00 eV on bridge, and 6.23 eV on hollow, in contrast to 4.57 eV in clean surface. The work function and DOS indicated that CO layer was insulating.

Key wordsCu(001)      CO monolayer      Atomic geometry      Density of state     
Received: 22 June 2007      Published: 08 October 2007
MSC2000:  O641  
  O647  
Corresponding Authors: ZHAO Xin-Xin     E-mail: bighunter@sues.edu.cn
Cite this article:

ZHAO Xin-Xin; MI Yi-Ming. First-Principle Calculations on the Atomic Geometry and Electronic States of COMonolayer on Cu(001) Surface. Acta Phys. -Chim. Sin., 2008, 24(01): 127-132.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20080122     OR     http://www.whxb.pku.edu.cn/Y2008/V24/I01/127

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