Publikationen

The structural evolution of multi-layer graphene stacks in carbon fibers under load at high temperature - A synchrotron radiation study

Autor(en)
Harald Rennhofer, Stephan Puchegger, Silvia Pabisch, Christian Rentenberger, Chenghao Li, Stefan Siegel, Andreas Steiger-Thirsfeld, Oskar Paris, Herwig Peterlik
Abstrakt

Single carbon fibers were directly heated and tensile tested in vacuum in a specially designed in-situ X-ray testing device. We followed the structural evolution by diffraction of synchrotron radiation X-rays and determined the effect of time, temperature and applied stress on the growth of nanocrystallites as well as their orientational change with respect to the fiber axis. As the nanocrystallites are stacks of graphene sheets, this is a direct measurement of the development of multi-layer graphene with temperature. In the same experiment, size and orientation of pores within the material were obtained from simultaneous in-situ small-angle X-ray scattering. It turned out that the final temperature is decisive for structural evolution, significantly more than time or load. The multi-layer graphene network structure in fibers after heat treatment without stress is stable, whereas this is not the case in fibers without heat treatment, no matter if the carbon fibers were produced from polyacrylonitrile or from mesophase pitch precursor.

Organisation(en)
Fakultätszentrum für Nanostrukturforschung, Physik Nanostrukturierter Materialien, Dynamik Kondensierter Systeme
Externe Organisation(en)
Montanuniversität Leoben, Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Technische Universität Wien, Universität für Bodenkultur Wien
Journal
Carbon
Band
80
Seiten
373-381
Anzahl der Seiten
9
ISSN
0008-6223
DOI
https://doi.org/10.1016/j.carbon.2014.08.076
Publikationsdatum
12-2014
Peer-reviewed
Ja
ÖFOS 2012
Kondensierte Materie
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/the-structural-evolution-of-multilayer-graphene-stacks-in-carbon-fibers-under-load-at-high-temperature--a-synchrotron-radiation-study(e033f229-b239-4b26-a980-9ad91a35e0ca).html