### Journal ofEngineering and Technology Research

• Abbreviation: J. Eng. Technol. Res.
• Language: English
• ISSN: 2006-9790
• DOI: 10.5897/JETR
• Start Year: 2009
• Published Articles: 183

Full Length Research Paper

## Effect of oxygen plasma treatments on the structural and optical properties of polyimide films

##### A. Atta
• A. Atta
• Department of Physics, National Center for Radiation Research and Technology, Nasr City, Cairo, Egypt
##### S. M. El-Sayed
• S. M. El-Sayed
• Department of Physics, National Center for Radiation Research and Technology, Nasr City, Cairo, Egypt
A detailed study of some physical properties of Polyimide films after exposing them to oxygen plasma is presented. The structure of the sample has been analyzed by X-ray diffraction technique (XRD) and is found to be semi crystalline. Thermogravimetric Analysis (TGA) studies revealed that the thermal stability of polyimide films have improved after being exposed to oxygen plasma, at different time intervals, ranging from 1 to 5 min. Optical constants such as refractive index (n), extinction coefficient (K) and complex dielectric constant have been determined. A great dependence of the fundamental optical constants on the exposure time was noticed. Upon exposure to oxygen plasma, decrease in the refractive index was obtained. On the other hand the driving absorption coefficient (α) and consequently the optical band gap have been estimated. The real () and imaginary parts (`) of the dielectric constant have been determined. The dispersion parameters such as E0 (single-oscillator energy), Ed (dispersive energy) and M-1, M-3 (moments) were calculated and discussed.