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Surface modification of carbon nanofibres in low temperature plasmas
Ist Teil von
Diamond and related materials, 2004-04, Vol.13 (4), p.1177-1181
Ort / Verlag
Amsterdam: Elsevier B.V
Erscheinungsjahr
2004
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
Carbon nanofibres (vapour grown carbon fibres, VGCF) were treated in RF plasma to enhance the wettability and thus to improve the bonding to the matrix in polymer composites. The surface of these fibres was modified using nitrogen and oxygen containing plasma gases. The water contact angles of VGCF nanofibres decrease at plasma treatments in NH
3, O
2, CO
2, H
2O and formic acid. The wettability strongly depends on applied process pressure. In the range of 0.01 to 1 mbar the water contact angle at treatments in NH
3 increases with increasing pressure. However, using O
2, CO
2, H
2O and HCOOH the water contact angle decreases with increasing process pressure. The investigations of the surface composition by XPS measurements show that the oxygen containing gases differ in oxidation strength. O
2 and CO
2 lead to the higher concentrations of COOH and CO functional groups on the surface in comparison to H
2O and HCOOH.