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Copyright of Iraqi Journal of Physics is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Baghdad Science Journal is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study shows the effects of copper material electrode, applied voltage, and different pressure values on electrical discharge plasma. The purpose of the work is the application of the spectral analysis method to obtain accurate results of nitrogen plasma parameters. By using the optical emission spectroscopy (OES), many N2 molecular spectra peaks appeared in the range from 300 to 480 nm. Also, some additional peaks were recorded, corresponding to atomic and ionic lines for nitrogen, target material, and hydrogen, in all samples. The electron density (ne) was calculated from the measurement of Stark broadening effect, which was found to decrease with increasing pressure from 0.1 mbar to 0.8 mbar. The higher emission intensities occurred at 0.2 mbar working pressure and were reduced with higher pressure. The vibrational temperature (Tvib) for N2 increased from 0.17 to 0.33 eV with increasing the pressure from 0.15 mbar to 0.2 mbar, then decreased to 0.25 eV with increasing the pressure to 0.8 mbar. Other plasma parameters were studied, which are electron temperature (Te), plasma frequency of electron (ωp), and Debye length (λD). [ABSTRACT FROM AUTHOR]

The production of semitransparent electrical conductive films is even more necessary due to their widespread utilization in research and industry. In this paper, the graphene oxide (GO) effects as an impurity on tin dioxide (SnO2) thin films and the SnO2–GO composite formation before and after plasma treatment have been studied to use in optoelectronic applications. The effects of graphene oxide addition and plasma treatment on the optical, electrical and structural properties of SnO2 thin films were investigated. According to the structural results of X-ray diffraction spectrum before and after applying the plasma, SnO2 thin film has a polycrystalline structure with tetragonal cassiterite phase and no peak related to impurity or other phases is seen. According to the electrical results, due to applying plasma in both pure tin oxide sample and SnO2–GO sample, the strength and resistance of the sheet decreased, but the mobility and density of the carriers increased. According to the optical results, the thin films of SnO2 show a large transfer of 75–90%, and the transfer rate is reduced by adding the graphene oxide to SnO2–GO nanocomposite. The refractive index and extinction coefficient were also evaluated for SnO2 films and SnO2–GO nanocomposite before and after plasma treatment. [ABSTRACT FROM AUTHOR]

Copyright of Iraqi Journal of Science is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)