Effects of vacancy percentage on the energy gap of zigzag single-wall carbon nanotubes |
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Authors: | Edris Faizabadi Ali Bagheri |
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Institution: | aDepartment of Physics, Iran University of Science and Technology, 16844 Tehran, Iran;bDepartment of Physics, Faculty of Science, K. N. Toosi University of Technology, 15875-4416 Tehran, Iran |
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Abstract: | The influence of vacancy percentage on the energy gap of zigzag single-wall carbon nanotube is investigated by the Green's function method in coherent potential approximation. Our probes for various kinds of zigzag single-wall carbon nanotubes show that by increasing vacancy percentage the energy gap is also increased, so for metallic single-wall carbon nanotubes, a metallic to semi-metallic transition is occurred. However, any transition does not appear for semiconductor carbon nanotubes. So by controlling on concentration of vacancies, one can make a semiconductor SWCNT with a predetermined energy gap which is useful in nanoelectronic devices. |
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Keywords: | Vacancy percentage Zigzag single-wall carbon nanotubes Energy gap |
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