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Zinc Oxide Nanowires Prepared by Oblique Angle Deposition Method

Authors: Wafaa K. Khalef --- Ali A. Aljubouri --- Hayfa G. Rashid
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2016 Volume: 12 Issue: 1 Pages: 3-9
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

This paper presents a detailed study of the oblique deposition effect on the morphology, structure and optical properties of ZnO nanowires (NWs) prepared by the deposition of zinc metallic films on glass substrates at different angles (0, 50 and 70°) and then oxidized in air at 650°C. Highly transparent ZnO thin films were successfully prepared by the oblique angle deposition (OAD) technique on glass substrates at room temperature. Atomic force microscopy (AFM) results show that the sample obliquely deposited presented greater roughness as compared with normally deposited ZnO NWs (Ө=0). Optical measurements showed a sharp absorption edge, near 380 nm, in both normal and oblique films. When the oblique angle increased, the absorption edge of spectra demonstrated a red shift with a direct band gap (3.11eV). Scanning electron microscopy (SEM) results show that the OAD led to the formation of bent columnar ZnO NWs. These NWs were inclined from the substrate normal in a direction opposite to the incident vapor beam. Due to the OAD technique, surface diffusion enhanced the self-shadowing effect. When oblique Zn thin film was later oxidized in air at 650°C for a longer time, the ZnO NWs had a needle-like structure, as was clearly shown by SEM images obtained.


Article
Zinc Oxide Nanowires Prepared by Oblique Angle Deposition Method
أسلاك أوكسيد الزنك النانوية المحضرة بطريقة الترسيب بزاوية مائلة

Authors: Wafaa K. Khalef --- Ali A. Aljubouri --- Hayfa G. Rashid
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2017 Volume: 13 Issue: 1 Pages: 3-9
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

This paper presents a detailed study of the oblique deposition effect on the morphology, structure and optical properties of ZnO nanowires (NWs) prepared by the deposition of zinc metallic films on glass substrates at different angles (0, 50 and 70°) and then oxidized in air at 650°C. Highly transparent ZnO thin films were successfully prepared by the oblique angle deposition (OAD) technique on glass substrates at room temperature. Atomic force microscopy (AFM) results show that the sample obliquely deposited presented greater roughness as compared with normally deposited ZnO NWs (Ө=0). Optical measurements showed a sharp absorption edge, near 380 nm, in both normal and oblique films. When the oblique angle increased, the absorption edge of spectra demonstrated a red shift with a direct band gap (3.11eV). Scanning electron microscopy (SEM) results show that the OAD led to the formation of bent columnar ZnO NWs. These NWs were inclined from the substrate normal in a direction opposite to the incident vapor beam. Due to the OAD technique, surface diffusion enhanced the self-shadowing effect. When oblique Zn thin film was later oxidized in air at 650°C for a longer time, the ZnO NWs had a needle-like structure, as was clearly shown by SEM images obtained.


Article
Structural and Optical Constants of Fe-doped SnO2 Thin Film

Authors: Cheman B. Ismaeil --- Nawroz I. Hassan --- Basim E. Gasgous --- Hayfa G. Rashid
Journal: Journal of College of Education مجلة كلية التربية ISSN: 18120380 Year: 2012 Issue: 1 Pages: 29-40
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Tin oxide and Fe-doped tin oxide have been prepared using chemical spray pyrolysis. XRD analysis reveals that all the films are polycrystalline with tetragonal structure. The average grain size is found to decrease from 51Ǻ to 40Ǻ due to Fe-doping. Absorbance and transmittance are recorded in order to calculate kind of transition and optical constants. It is found that optical energy gap decrease after doping and all the optical constants are affected by Fe-doping.

حضرت اغشية ثنائي اوكسيد القصدير واغشية ثنائي اوكسيد القصدير المشوبة بالحديد باستخدام الترسيب الكيميائي الحراري. بينت نتائج حيود الاشعة السينية بان كافة الاغشية من ذات طبيعة متعددة البلور ورباعية التركيب. لقد وجد بان معدل الحجم الجيبي قد انخقض من 51Ǻ الى 40Ǻ نتيجة التشويب بالحديد.سجل طيفي الامتصاصية والنفاذية لغرض معرفة نوع الانتقال وحساب الثوابت البصرية. لقد وجد بان فجوة الطاقة البصرية تقل بعد التشويب بالحديد وان طاقة الثوابت البصرية قد تاثرت نتيجة التشويب.

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Article
Structural and Optical Constants of Fe-doped SnO2 Thin Film

Authors: Basim E. Gasgous --- Nawroz I. Hassan --- Cheman B. Ismaeil --- Hayfa G. Rashid
Journal: Journal of College of Education مجلة كلية التربية ISSN: 18120380 Year: 2013 Issue: 1 Pages: 463-474
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Tin oxide and Fe-doped tin oxide have been prepared using chemical spray pyrolysis.XRD analysis reveals that all the films are polycrystalline with tetragonal structure. The average grain size is found to decrease from 51Ǻ to 40Ǻ due to Fe-doping. Absorbance and transmittance are recorded in order to calculate kind of transition and optical constants. It is found that optical energy gap decrease after doping and all the optical constants are affected by Fe-doping.

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