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Mechanical Properties of Pentagraphene-based Nanotubes: A Molecular Dynamics Study

Published online by Cambridge University Press:  06 February 2018

J. M. de Sousa
Affiliation:
Applied Physics Department and Center of Computational Engineering and Science, University of Campinas - UNICAMP, Campinas-SP 13083-959, Brazil. Departamento de Física, Universidade Federal do Piauí, Teresina-PI, 64049-550, Brazil.
A. L. Aguiar
Affiliation:
Departamento de Física, Universidade Federal do Piauí, Teresina-PI, 64049-550, Brazil.
E. C. Girão
Affiliation:
Departamento de Física, Universidade Federal do Piauí, Teresina-PI, 64049-550, Brazil.
Alexandre F. Fonseca
Affiliation:
Applied Physics Department and Center of Computational Engineering and Science, University of Campinas - UNICAMP, Campinas-SP 13083-959, Brazil.
A. G. Souza Filho
Affiliation:
Departamento de Física, Universidade Federal do Ceará, Fortaleza-CE, 60445-900, Brazil.
Douglas S. Galvao
Affiliation:
Applied Physics Department and Center of Computational Engineering and Science, University of Campinas - UNICAMP, Campinas-SP 13083-959, Brazil.
Corresponding
E-mail address:

Abstract

The study of the mechanical properties of nanostructured systems has gained importance in theoretical and experimental research in recent years. Carbon nanotubes (CNTs) are one of the strongest nanomaterials found in nature, with Young’s Modulus (EY) in the order 1.25 TPa. One interesting question is about the possibility of generating new nanostructures with 1D symmetry and with similar and/or superior CNT properties. In this work, we present a study on the dynamical, structural, mechanical properties, fracture patterns and EY values for one class of these structures, the so-called pentagraphene nanotubes (PGNTs). These tubes are formed rolling up pentagraphene membranes (which are quasi-bidimensional structures formed by densely compacted pentagons of carbon atoms in sp3 and sp2 hybridized states) in the same form that CNTs are formed from rolling up graphene membranes. We carried out fully atomistic molecular dynamics simulations using the ReaxFF force field. We have considered zigzag-like and armchair-like PGNTs of different diameters. Our results show that PGNTs present EY ∼ 800 GPa with distinct elastic behavior in relation to CNTs, mainly associated with mechanical failure, chirality dependent fracture patterns and extensive structural reconstructions.

Type
Articles
Copyright
Copyright © Materials Research Society 2018 

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