Electronic and mechanical properties of (6,1) single-walled carbon nanotubes with different tube diameters: a theoretical study
| Autor: | D. P. Rai, Kingsley Onyebuchi Obodo, Y. T. Singh, Pratap Kumar Patra |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Graphene Band gap Process Chemistry and Technology Organic Chemistry Exchange interaction Lattice (group) Energy Engineering and Power Technology Carbon nanotube Molecular physics law.invention Inorganic Chemistry Bond length Linear combination of atomic orbitals law Materials Chemistry Ceramics and Composites Density functional theory |
| Zdroj: | Carbon Letters. 32:451-460 |
| ISSN: | 2233-4998 1976-4251 |
| Popis: | We investigated the electronic and mechanical properties of single-walled carbon nanotubes (SWCNTs) with different tube diameters using density functional theory (DFT) and molecular dynamics (MD) simulation, respectively. The carbon nanotubes’ electronic properties were derived from the index number ( $$n_1$$ , $$n_2$$ ), lattice vectors, and the rolled graphene sheet orientation. For (6,1) SWCNT, ( $$n_{1}$$ - $$n_{2}$$ )/3 is non-integer, so the expected characteristic is semiconducting. We have considered (6,1) Chiral SWCNT with different diameters ‘d’ (4.68 A, 4.90 A, 5.14 A, 5.32 A, 5.53 A) corresponds to respective bond lengths ‘ $$\delta$$ ’ (1.32 A, 1.38 A, 1.45 A, 1.50 A and 1.56 A) and then analyze the electronic properties from the Linear Combination of Atomic Orbitals (LCAO) based on DFT. We have used both the DFT-1/2 and GGA exchange energy correlation approximations for our calculation and compared the results. In both cases, the energy bandgap is decreasing order with the increase in bond lengths. The lowest value of formation energy was obtained at the bond length $$\delta =1.45$$ A ( $$d=5.14$$ A). For the mechanical properties, we have calculated Young’s modulus using molecular dynamics (MD) simulations. From our calculation, we have found that the (6,1) SWCNT with bond length 1.45 A ( $$d=5.14$$ A) has Young’s modulus value of 1.553 TPa. |
| Databáze: | OpenAIRE |
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