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Article
Characterization of Low-Pressure Argon and Nitrogen Discharge Plasmas Using Electrical Floating Probe Method

Authors: M.A.K. Ahmed --- A.S. Jasim --- K.I. Khaleel
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2013 Volume: 9 Issue: 3 Pages: 25-28
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

In this work, a low-pressure dc-discharge plasma is characterized by electrical floating probe method. To get sufficient working conditions for plasma electrical probe, a sweep voltage power supply was built. The plasma generation chamber was used to produce glow-discharge using nitrogen and argon gases at pressures of 0.03, 0.07 and 0.1 mbar. The current-voltage characteristics were performed using plasma probe and some calculations, such as electron temperature, plasma frequency and plasma species density, were carried out. The results obtained from I-V curve showed that electron temperature for argon and nitrogen plasmas was increased by increasing gas pressure.


Article
Influence of Magnetic Nitrogen Plasma Functionalization of High Density Polycarbonate

Authors: A.S. Jasim --- K.I. Khaleel --- M.A.K. Ahmed --- Y.K. Vijay --- et al.
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2012 Volume: 8 Issue: 4 Pages: 17-22
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

Low pressure nitrogen plasma has been used to modify surface properties of polycarbonate membrane. Evaluation of surface morphology changes has been carried out using atomic force microscopy (AFM). To study surface topography changes related to etching effect, the scanning electron microscopy (SEM) has been carried out. The results show a considerable improvement in surface roughness, SEM and AFM analyses show remarkable changes in surface topography as a consequence of the plasma-etching mechanism. The increasing of optical transparency of the plasma treated membranes was observed from UV-visible spectroscopy. The refractive index value for treated films has been decreased as observed from laser ellipsometry measurement. Furthermore, the changes in chemical bonds for polymer films were studied. It is found that plasma treatment can change chemical structure of polymer surfaces partially.

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