Mechanical properties of individual carbon nanofibers

Tanil Ozkan, Mohammad Naraghi, Ioannis Chasiotis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Three grades of heat-treated Pyrograf-III carbon nanofibers with diameters of the order of 100-200 nm were tested for their tensile strength by a novel MEMS-based mechanical testing platform. The nominal tensile strengths of the pyrolytically stripped nanofibers and the heat-treated nanofibers followed Weibull distributions with Weibull characteristic strength values between 2.8-3.3 GPa. The true material strengths excluding the hollow fiber cores were twice the nominal strengths. The nanofiber fracture surface had all the elements of brittle fracture with an additional slip of the angled graphene layers comprising the nanofibers. SEM and TEM images of the matching ruptured surfaces pointed to a failure geometry that agrees with the "dixie cup" structure of Pyrograf-III. The change in the mechanical strength and its scatter with heat treatment correlated well with TEM images, which showed increased graphitic content at the expense of the outer turbostratic layer and a loose connectivity of its interface with the inner, originally graphitic, layer.

Original languageEnglish (US)
Title of host publicationSociety for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009
Pages545-551
Number of pages7
StatePublished - Dec 1 2009
EventSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009 - Albuquerque, NM, United States
Duration: Jun 1 2009Jun 4 2009

Publication series

NameSociety for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009
Volume1

Other

OtherSEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009
CountryUnited States
CityAlbuquerque, NM
Period6/1/096/4/09

ASJC Scopus subject areas

  • Computational Mechanics

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  • Cite this

    Ozkan, T., Naraghi, M., & Chasiotis, I. (2009). Mechanical properties of individual carbon nanofibers. In Society for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009 (pp. 545-551). (Society for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009; Vol. 1).