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Study of plasmas in He–O2 mixturesand their role on the stability of the surface properties of polymers*

Published online by Cambridge University Press:  15 November 1998

F. Arefi-Khonsari ,
G. Placinta ,
J. Amouroux  and
G. Popa
F. Arefi-Khonsari*
Affiliation:
Plasma Processing Laboratory, ENSCP, Paris VI University, France
G. Placinta
Affiliation:
Plasma Physics Department, “A. I. Cuza” University, Iasi–6600, Romania
J. Amouroux
Affiliation:
Plasma Processing Laboratory, ENSCP, Paris VI University, France
G. Popa
Affiliation:
Plasma Physics Department, “A. I. Cuza” University, Iasi–6600, Romania
*
[email protected]
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Abstract

The characteristics of a low frequency (70 kHz) discharge with non-symmetrical configuration of electrodes in He–O2 mixtures were investigated. The Langmuir probe technique, emission spectroscopy, mass spectrometry and absorption spectroscopy were used for plasma diagnostics. The physicochemical properties of PET (polyethylene terephtalate) were analyzed via contact angle measurements and XPS spectroscopy. The presence of the oxygen is shown to modify both the densities of the helium metastable states and also the energetic character of the discharge. The very efficient loss of He excited species and in particularly the metastables, for amounts of O2 higher than a few percents, affects the surface modification in terms of crosslinking, and therefore the stability. This work has shown that one of the important species responsible for the crosslinking process leading to stable surface properties could be the helium metastables.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 4 , Issue 2 , November 1998 , pp. 193 - 201
Copyright
© EDP Sciences, 1998

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Footnotes

*

This article is published after the COST-PISE (Plasma Ion Surface Engineering) meeting in Nancy, on September 11-12, 1997.

References

* This article is published after the COST-PISE (Plasma Ion Surface Engineering) meeting in Nancy, on September 11-12, 1997.