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Structures, stabilities, and electronic properties of GaAs tubelike clusters and single-walled GaAs nanotubes |
| Liu Li-Ren (刘立仁)a, Zhu Heng-Jiang (祝恒江)a, Liu Zhi-Feng (刘志锋)b, Wu Peng (吴鹏)a |
a School of Physics and Electronic Engineering, Xinjiang Normal University, Urumchi 830054, China;
b College of Physics, Chongqing University, Chongqing 401331, China |
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Abstract The geometric structures, stabilities, and electronic properties of (GaAs)n tubelike clusters at up to n=120 and single-walled GaAs nanotubes (GaAsNTs) were studied by density functional theory (DFT) calculations. A family of stable tubelike structures with Ga-As alternating arrangement were observed when n≥8 and their structure units (four-membered rings and six-membered rings) obey the general developing formula. The average binding energies of the clusters show that the tubelike cluster with eight atoms in the cross section is the most stable cluster. The size-dependent properties of the frontier molecular orbital surfaces explain why the long and stable tubelike clusters can be obtained successfully. They also illustrate the reason why GaAsNTs can be synthesized experimentally. We also found that the single-walled GaAsNTs can be prepared by the proper assembly of tubelike clusters to form semiconductors with large bandgap.
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Received: 02 July 2012
Revised: 26 August 2012
Accepted manuscript online:
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PACS:
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36.40.Qv
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(Stability and fragmentation of clusters)
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36.20.Kd
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(Electronic structure and spectra)
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61.46.Fg
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(Nanotubes)
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71.15.Mb
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(Density functional theory, local density approximation, gradient and other corrections)
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| Fund: Project supported by the Key Subject of Theoretical Physics of Xinjiang Uygur Autonomous Region (Young Teachers Scientific Research Fund), China, the Natural Science Foundation of Xinjiang Uygur Autonomous Region, China (Grant No. 2010211A21), and the Key Project of Higher Education of Xinjiang Uygur Autonomous Region, China (Grant No. xjedu2009i27). |
Corresponding Authors:
Zhu Heng-Jiang
E-mail: zhj@xjnu.edu.cn
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Cite this article:
Liu Li-Ren (刘立仁), Zhu Heng-Jiang (祝恒江), Liu Zhi-Feng (刘志锋), Wu Peng (吴鹏) Structures, stabilities, and electronic properties of GaAs tubelike clusters and single-walled GaAs nanotubes 2012 Chin. Phys. B 21 123601
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