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Study of carbon fiber surfaces by scanning tunneling microscopy, part III. Carbon fibers after surface treatments

✍ Scribed by Ren-Yan Qin; Jean-Baptiste Donnet

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
905 KB
Volume
32
Category
Article
ISSN
0008-6223

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✦ Synopsis

The effect of surface treatments on carbon fibers has been studied by scanning tunneling microscopy (STM). The results show that over a wide range of oxidation degrees the anodic or electrochemical oxidation does not change the surface aspects, neither at microscopic scale nor at nanometric scale, while the air plasma oxidation under the experimental conditions gives rise to surface roughness and surface degradation. The results at atomic resolution have also revealed that the electrochemical treatment yields a modest oxidation on the surface ofcarbon fiber and that the oxidation attack takes place preferentially at edge sites of graphitic crystallites. The microstructure of the fibers after anodic oxidation resembles very much that of low-temperature carbonized fibers observed by STM. The structural imperfection has been tentatively interpreted in terms of the formation of intercalated graphite compounds that render the graphite layer stacking imperfect.

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