From mesoscale to nanoscale mechanics in single-wall carbon nanotubes

Autor(en)

Abraao C. Torres-Dias, Tiago F. T. Cerqueira, Wenwen Cui, Miguel A. L. Marques, Silvana Botti, Denis Machon, Markus A. Hartmann, Yiwei Sun, David J. Dunstan, Alfonso San-Miguel

Abstrakt

The analysis of the radial collapse of individualized and isolated single-wall carbon nanotubes under high pressure as function of their diameter, d, distinguishes their mesoscale and their nanoscale mechanics. The evolution with pressure of the Raman spectra for nine tube chiralities and the theoretical modelling reveal a deviation from the continuum mechanics prediction of a collapse pressure P

_C∝d

⁻³. Nanotubes show a normalized collapse pressure P

_N=P

_Cd

³=24αD(1−β

²/d

²) both in experiment and in very different theoretical models. In this expression β=0.44±0.04nm represents the smallest diameter for a stable freestanding single-wall carbon nanotube and D is the bending stiffness of graphene. From the experimental data D=1.7±0.2eV. Deviations from the continuum mechanics predictions start to be of significance for diameters smaller than ∼1nm. The associated reduction of their collapse pressure is attributed to the discretization of the elastic compliances around the circumference of the tubes.

Organisation(en)

Computergestützte Physik und Physik der Weichen Materie

Externe Organisation(en)

Université Claude-Bernard-Lyon-I, Universidade Federal do Ceará, Martin-Luther-Universität Halle-Wittenberg, Queen Mary University of London, Friedrich-Schiller-Universität Jena

Journal

Carbon

Band

123

Seiten

145-150

Anzahl der Seiten

6

ISSN

0008-6223

DOI

https://doi.org/10.1016/j.carbon.2017.07.036

Publikationsdatum

10-2017

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Allgemeine Chemie, Allgemeine Materialwissenschaften

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/47d08790-5eeb-48ff-890b-a6be20c07078