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Article
Structural Properties of Nickel Oxide Nanostructures Prepared by Closed-Field Unbalanced Dual Magnetron Sputtering Technique

Authors: Firas J. Kadhim --- Oday A. Hammadi --- Mohammed K. Khalaf
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2017 Volume: 13 Issue: 2 Pages: 3-10
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, nickel oxide nanostructures were prepared by a closed-field unbalanced dual magnetron plasma sputtering technique. The structural characterizations performed on the prepared samples showed that they were polycrystalline and the optimization of preparation conditions, only two crystal planes; (111) and (012), were observed in the final product. The surface roughness of the nanostructures can be varied by controlling the inter-electrode distance. Minimum particle size of 25nm was determined for the samples prepared at inter-electrode distance of 6cm.


Article
Nanostructured CdSnSe Thin Films Prepared by DC Plasma Sputtering of Thermally Casted Targets

Author: Oday A. Hammadi
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2018 Volume: 14 Issue: 4 Pages: 33-36
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, nanostructured cadmium tin selenide (CdSnSe) thin films were deposited on glass substrates by dc plasma sputtering technique. The sputtered target was prepared by the thermal casting of Cd, Sn and Se samples at 350°C. The structural characterizations showed that the prepared targets were polycrystalline while the deposited CdSnSe films exhibited amorphous structure due to the growth of nanostructures on the substrates, which was also confirmed by the scanning electron microscopy. These films showed high absorption in the ultraviolet and visible regions while low absorption was observed in the near-infrared region (>800nm). They have two allowed types of energy band gaps; indirect at 1.233eV and direct at 1.655eV. The dispersion relationship showed that these films have approximately constant refractive index in the visible region, which is attributed to the optical homogeneity of the prepared films.


Article
Effect of Adding Nitrogen to the Gas Mixture on Plasma Characteristics of a Closed-Field Unbalanced DC Magnetron Sputtering System

Authors: Firas J. Kadhim --- Mohammed K. Khalaf --- Oday A. Hammadi
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2014 Volume: 10 Issue: 1 Pages: 27-31
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, the role of adding nitrogen gas to the discharge gas mixture containing argon was studied by introducing the electrical characteristics of plasma generated between two closed-field unbalanced magnetron electrodes. This role was also related to the presence and absence of magnetron at the electrodes in the fundamental design of such sputtering system. The role of nitrogen gas added to the gas mixture was reasonably observed by enhancing the electrical characteristics of the glow discharge plasma generated between the dual CFUBM electrodes. Adding nitrogen caused to increase the concentration of the charged particles produced by collisional ionization in discharge volume as the mean free path of primary discharge electrons was reduced. A relative reduction in electron temperature was observed as a result of adding nitrogen with increase in electron and ion densities while no observed difference was observed in the ion temperature due to their larger masses compared to those of electrons.


Article
Fabrication and Characterization of Gas Sensor from ZrO2: MgO Nanostructure Thin Films by R.F. Magnetron Sputtering Technique
تصنيع متحسس غازي من اغشية ZrO2:MgO النانوية باستخدام تقنية الترذيذ الماكنتروني ببلازما الترددات الراديوية

Authors: Souad G. Khalil سعاد غفوري خليل --- Mahdi M. Mutter مهدي محمود مطر --- Zainab K. Mohammed زينب قاسم محمد --- Ghassan Salem غسان سالم
Journal: Baghdad Science Journal مجلة بغداد للعلوم ISSN: 20788665 24117986 Year: 2019 Volume: 16 Issue: 1 Supplement Pages: 199-208
Publisher: Baghdad University جامعة بغداد

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Abstract

Thin films ZrO2: MgO nanostructure have been synthesized by a radio frequency magnetron plasma sputtering technique at different ratios of MgO (0,6, 8 and 10)% percentage to be used as the gas sensor for nitrogen dioxide NO2. The samples were investigated by X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) and sensing properties were also investigated. The average particle size of all prepared samples was found lower than 33.22nm and the structure was a monoclinic phase. The distribution of grain size was found lower than36.3 nm and uninformed particles on the surface. Finally, the data of sensing properties have been discussed, where they indicated that sensitivity reached 42.566% at 300 oC, spectral response time less than 52.2 s and recovery time 135.9 s.

الأغشية الرقيقة ذو تركيب نانوي من ZrO2:MgO تم تحضيرها باستخدام تقنية الترذيذ ببلازما الترددات الراديوية بنسب مختلفة من MgO كانت (10,8,6,0) % لغرض الاستخدام كمتحسس غازي لغاز ثاني اوكسيد النيتروجين NO2 .العينات المحضرة تم توصيفها باستخدام حيود الأشعة السينية XRD ,مجهر القوى الذرية AFM ,الماسح الالكتروني SEM , تشتت طاقة الأشعة السينية EDX والخواص التحسسية تم تحقيقها أيضا. الحجم الحبيبي للعينات المحضرة وجد اقل من (33.22 nm) والتركيب البلوري كان أحادي الطور. توزيع الحجم الحبيبي على السطح كان اقل من (36.3 nm) مع تجانس في توزيع الجسيمات على السطح.أخيرا نتائج الخواص التحسسية تم مناقشتها. حيث إشارة النتائج إلى إن التحسسية الغازية وصلت إلى (42.566 %) عند درجة حرارة (300) درجة مؤية وزمن استجابة كان (52.2) ثانية مع زمن عودة (135.9) ثانية.

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