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Ye, Yuanfeng; Zhang, Milin; Zhao, Jianwei; Liu, Hongmei; Wang, Nan
Journal of molecular structure. Theochem, 07/2008, Letnik: 861, Številka: 1Journal Article
The structural, energetic and electronic features of asymmetric armchair single-walled carbon nanotube (SWCNT) junctions have been studied by ab initio calculations at the B3LYP/6-31G ∗//HF/3-21G ∗ levels. The junctions are composed of two SWCNTs with different radius, which are connected by a set of 5-membered and 7-membered carbon rings. The results show that the metallic–metallic junction is more energetically favorable if the junction is formed with a hexagon inserted between the pentagon–heptagon (5/7) pair defects in the armchair nanotube. The shift of the spatial distribution of HOMO and LUMO shows that the asymmetric electronic structure of the junction could be used as a molecular rectifier.
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