Effect of tubular chiralities of single-walled ZnO nanotubes on electronic transport |
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| Institution: | 1. College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China;2. Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou 215125, China;1. Chemical Engineering Institute, Nanjing University of Science and Technology, Nanjing 210094, PR China;2. Jiangsu Marine Resources Development Research Institute, Lianyungang 222001, PR China;3. School of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, PR China;1. Centro de Investigación en Ciencias, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, C.P. 62209 Cuernavaca, Morelos, Mexico;2. Unidad Académica de Física, Universidad Autónoma de Zacatecas. Calzada Solidaridad esquina con Paseo La Bufa S/N. C.P. 98060 Zacatecas, Zacatecas, Mexico;3. Instituto de Física, Benemérita Universidad Autónoma de Puebla, 18 Sur y San Claudio, Edif. 110-A, Ciudad Universitaria, C.P. 72570 Puebla, Puebla, Mexico;1. Department of Mechanical Engineering, Neyshabur Branch, Islamic Azad University, Neyshabur, Iran;2. Young Researchers and Elite Club, Neyshabur Branch, Islamic Azad University, Neyshabur, Iran;3. Mechanical Engineering Department, Babol University of Technology, Babol, Iran;1. Department of Physics and Solar Energy Research Center, Pingdingshan University, Pingdingshan 467000, PR China;2. Department of Mathematics and Information Science, North China University of Water Resources and Electric Power, Zhengzhou 450045, PR China;1. College of Science, Xi''an University of Architecture and Technology, Xi''an 710055, Shaanxi, PR China;2. College of Physics and Electronic Engineering, Nanyang Normal University, Nanyang 473061, Henan, PR China;1. Département des Sciences de la Matière, Institut des Sciences et de la Technologie, Centre Universitaire de Tamanghasset, BP10034 Sersouf, Tamanghasset, Algeria;2. Laboratoire de Physique de l’Etat Condensé UMR 6087, Université du Maine, 72085 Le Mans, France |
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| Abstract: | The electronic transport properties of single-walled ZnO nanotubes with different chiralities are investigated by nonequilibrium Green's function combined with density functional theory. In this paper we consider three representative ZnO nanotubes, namely (3, 3) armchair, (5, 0) zigzag, and (4, 2) chiral, with a similar diameter of about 5.4 Å. Short nanotubes exhibit good conductance behavior. As the tube length increases, the conductance decreases at low bias and the nanotubes indicate semiconducting behavior. The current-voltage characteristics of the nanotubes longer than 3 nm depend weakly on the length of the tubes. The armchair and chiral ZnO nanotubes with the same length and diameter have almost overlapped current-voltage curves. The electron transport behaviors are analyzed in terms of the transmission spectra, density of states and charge population of these nanotubes. The results indicate that the resonant peaks above the Fermi level are responsible for electric currents. However, the zigzag ZnO nanotubes exhibit asymmetric current-voltage curves attributed to the built-in polarization field and give larger current than the armchair and chiral nanotubes at the same bias. The features explored here strongly suggest that the ZnO nanotubes are stable, flexible structures, which are valuable in Nano-Electromechanical System. |
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| Keywords: | Transport properties Chirality ZnO nanotubes |
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