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Polystyrene thin films treatment under DC pulsed dischargein nitrogen: effect of sample placement and glow durationon the wettability

Published online by Cambridge University Press:  23 November 2004

J. Larrieu ,
B. Held ,
N. Soulem  and
N. Spyrou
J. Larrieu
Affiliation:
Laboratoire d'Électronique, des Gaz et des Plasmas, IPREM – FR CNRS 2606, EA 750, Université de Pau et des Pays de l'Adour, UFR Sciences, BP 1155, 64013 Pau Cedex, France
B. Held*
Affiliation:
Laboratoire d'Électronique, des Gaz et des Plasmas, IPREM – FR CNRS 2606, EA 750, Université de Pau et des Pays de l'Adour, UFR Sciences, BP 1155, 64013 Pau Cedex, France
N. Soulem
Affiliation:
Laboratoire d'Électronique, des Gaz et des Plasmas, IPREM – FR CNRS 2606, EA 750, Université de Pau et des Pays de l'Adour, UFR Sciences, BP 1155, 64013 Pau Cedex, France
N. Spyrou
Affiliation:
Electrotechnic Materials Laboratory, Electrical and Computer Engineering Department, University of Patras, 26500 Patras-Rio, Greece
*
bernard.held@univ-pau.fr
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Abstract

This paper is devoted to atactic polystyrene (aPS) thin films treatment under DC pulsed discharge in nitrogen. The experiments were performed using a symmetrical plane-to-plane of electrodes configuration in order to improve the treatment homogeneity and also to compare the treatment efficiency when the aPS is on the cathode or on the anode. During these experiments, the pressure and the electrical conditions were maintained unchanged. The experimental results were compared for the two positions of samples, when the gap length and the afterglow duration time were varied. It appears that the treatment depends on the sample position and an interpretation is proposed. The physical conditions and the reaction processes in the plasma bulk and on the aPS surface were analysed in order to understand their influence on the surface treatment. The importance of metastables is pointed out and it is deduced that these long-life excited states are firstly produced near the anode and fill the gap following the evolution and distribution of the electron current density.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 29 , Issue 2 , February 2005 , pp. 181 - 188
Copyright
© EDP Sciences, 2005

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