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Article
Structural Characteristics of γ-Al2O3 Nanoparticles Prepared by Laser-Assisted Spray Pyrolysis Technique

Authors: Bahaa T. Chiad --- Zainab S. Sadiq --- Dunia K. Mahdi --- Fatin H. Mohammed
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2015 Volume: 11 Issue: 2 Pages: 29-32
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

This work describes laser-assisted spray pyrolysis (LASP) technique developed to deposit nanoparticles coatings with controllable particles size. In this process, droplets of a precursor formed by atomizer are injected into a deposition chamber using SF6 as a carrier gas. The study were focused once on the effect of variation of the concentration of precursor solution on particle size of Al2O3 samples, and the other effect of variation of SF6 gas flow rate on the particle size of the samples. Decreasing of precursor concentration (0.25-0.1M) caused to decrease of the particle sizes with increase in density of Al2O3 nanoparticles. Decreasing of SF6 gas flow rate (4.5-2.5)L/min caused to decrease of the particle sizes with increase in density of Al2O3 nanoparticles and homogeneity of the samples.


Article
Synthesis and Study of Nanostructure Fe2o3 Film by Laser Assisted Spray Pyrolysis

Authors: Bahaa T. Chiad --- Zainab S. Sadik --- Dunia K. Mahdi --- Fatin H. Mohammed
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2015 Volume: 18 Issue: 3 Pages: 62-66
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Films of hematite (α-Fe2O3) were deposited by using laser assisted spray pyrolysis technique (LASP). The films were deposited on heated substrates with temperature 400̊C, once with using laser and other without laser, Structural analysis, using X-ray diffraction, verified the phase of the films and revealed that the films had a polycrystalline structure composed of nano-crystallites. Atomic force microscopy indicated that the films which deposited by laser assisted had smooth surface with smallest lateral grain size compared with the films deposited without laser, where the average grain size for the film deposited without laser about 146nm,while the average grain size for the film deposited with laser about 77nm.

رسبت اغشية من الهيماتايت (-Fe2O3α) باستعمال تقنية الانحلال الحراري بمساعدة الليزر. الافلام المترسبة على ركيزة بدرجة حرارة 400ͦ م, مرة باستعمال الليزر والاخرى بعدم استعمال الليزر. التحليل الهيكلي باستعمال حيود الاشعة السينية كشف ان طور الافلام لها بناء هيكلي متعدد التبلور مكون من بناء نانوي, مجهر القوة الذرية (AFM) يشير الى ان الاغشية المترسبة بمساعدة الليزر لها سطح املس مع حجم حبيبي اصغر مقارنة بالافلام المترسبة بدون الليزر, حيث ان معدل الحجم الحبيبي للغشاء المترسب بدون الليزر حوالي 146 نانومتر, بينما معدل الحجم البلوري للغشاء المترسب بمساعدة الليزر كان 77 نانو متر.

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