Физика Низких Температур: Том 47, Выпуск 10 (Октябрь 2021), c. 942-948 ( к оглавлению , назад )
Influence of temperature variation on the electrical conductivity of zigzag carbon nanotubes under homogeneous axial dc field
M. Amekpewu1, S. Y. Mensah2, R. Musah1, S. S. Abukari2, K. A. Dompreh2, N. G. Mensah3, and M. Kuwonu1
1Department of Applied Physics, C. K. Tedam University of Technology and Applied Sciences, Navrongo, Ghana
2Department of Physics, College of Agriculture and Natural Sciences, U.C.C, Ghana
3Department of Mathematics, College of Agriculture and Natural Sciences, U.C.C, Ghana
Received February 23, 2021, published online August 26, 2021
We present theoretical framework investigations of the influence of temperature variation on the electrical conductivity of zigzag carbon nanotubes (CNTs) under the applied homogeneous axial dc field. This study was done semiclassically by solving Boltzmann transport equation to derive the current density of zigzag CNT as a function of homogenous axial dc field and temperature. Plots of the normalized current density versus homogeneous dc field applied along the axis of semiconducting zigzag CNTs as room temperature increases from 293 to 299 K revealed a significant increase in electrical conductivity, whereas in metallic zigzag CNTs, almost constant or a negligible decrease in electrical conductivity is observed. The study predicts semiconducting zigzag CNT as a potential material for temperature sensors since it exhibits a faster response and a substantially higher sensitivity to room temperature changes than the metallic counterpart. The electrical conductivity of metallic zigzag CNTs increases immensely as the temperature is reduced to a very low value which could probably lead to a potential superconductivity property that usually occurs at very low temperatures. These potential temperature sensors and superconductors of nanomaterial have vast applications in current-day science and technology.
Key words: carbon nanotubes, conductivity, temperature variation, current density, dc field.