期刊
SURFACE SCIENCE
卷 603, 期 21, 页码 3234-3238出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2009.09.010
关键词
SWCNTs; Gas adsorption; Density-functional theory
资金
- National Natural Science Foundation of China [10734140, 60621003]
- National Basic Research Program of China [2007CB815105]
- National High-Tech ICF Committee in China
- Progetto Regionale NANOCAT
- Research Center of Supercomputing Application, NUDT
The adsorption of NOx(x = 1,2,3) molecules on single-walled carbon nanotubes (SWCNTs) is investigated using first-principle calculations. Single NO, NO2 and NO3 molecules are found to physisorb on SWCNTs, but molecules can be chemisorbed in pairs on the top of carbon atoms at close sites of SWCNTs. The adsorption energy for pairs of NO or NO3 molecules is larger than for pairs of NO2 molecules. The local curvature is found to have a sizable effect on adsorption energies. The possibility of a surface reaction NO2 + NO2 -> NO + NO3 is examined and the relative pathway and barrier is calculated. The results are discussed with reference to available experimental results. (C) 2009 Elsevier B.V. All rights reserved.
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