TY - GEN
T1 - Mechanical properties of individual carbon nanofibers
AU - Ozkan, Tanil
AU - Naraghi, Mohammad
AU - Chasiotis, Ioannis
PY - 2009/12/1
Y1 - 2009/12/1
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:73349089682
SN - 9781615671892
SN - 9781615671892
T3 - Society for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009
SP - 545
EP - 551
BT - Society for Experimental Mechanics - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009
T2 - SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009
Y2 - 1 June 2009 through 4 June 2009
ER -