ISSN:
0142-2421
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Physik
Notizen:
Teflon PFA (polytetrafluoroethylene-co-perfluoroalkoxy vinyl ether) was treated by a low-pressure microwave (2.45 GHz) plasma in O2, N2, H2, He and their mixtures. X-ray photoelectron spectroscopy measurements showed ablation of fluorine and incorporation of new O- and N-containing groups into the surface. Among the different gases, H2 is the most efficient for defluorination, N2 + H2 for surface functionalization, while O2 showed the least performance for both effects. Plasma treatments using N2 + H2 and O2 + H2 resulted in intermediate defluorination, i.e. between those in the pure gases, and sequential treatment by He/(N2 + H2) showed an additive effect of He and N2 + H2 alone. Angle-resolved XPS measurements revealed a pronounced gradient in the near-surface composition following H2, N2 + H2 and He/(N2 + H2) plasma treatments, in contrast to a more uniform depth distribution upon O2, N2 and He exposures. The surface modification of Teflon PFA leads to an enhanced adhesion of metals such as Cu, Ag and Au.
Zusätzliches Material:
8 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/sia.740230209
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