期刊
APPLIED SURFACE SCIENCE
卷 288, 期 -, 页码 452-457出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2013.10.054
关键词
CO adsorption; Cu2O (111) surface; Pre-adsorbed O atom; Sensing; DFT
类别
资金
- National Natural Science projects of China [20703027]
- Shandong Excellent Young Scientist Research Award Fund [BS2011NJ004]
- Foundation of Shandong Educational Committee [J09LB06]
- Qingdao University Research Fund [063-06300538]
The adsorption of CO molecule on the Cu2O (1 1 1) surface with or without pre-adsorbed oxygen atom (O-ad) has been investigated using density functional theory calculation. Calculations show that the adsorption of O-ad causes obvious changes in the electronic structure and charge distribution of Cu2O with a charge transfer of 0.48 e from substrate to O-ad. On the perfect Cu2O (1 1 1) surface, the one-fold coordinated copper (Cu-1c) atom is the most favorable site for the adsorption of CO with a charge transfer of 0.414 e from CO molecule to substrate. Moreover, it is found that the adsorption of CO on the O pre-adsorbed Cu2O (1 1 1) surface is strengthened. The adsorbed CO molecule tends to interact with O-ad atom and release the electrons trapped by the oxygen adatom back to the substrate, resulting in a significant charge variation (0.619 e). All these findings indicate that Cu2O would be a good candidate for the detection of CO gas. (C) 2013 Elsevier B.V. All rights reserved.
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