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صخللما  مجح يف رغصلا يف ةيهانتم تابيبح ريضحت مت ،ةيلاحلا ةساردلا يف 4 10  ةئيبلل ةقيدصو ةفلكتلا ةليلقو نمثلا ةصيخر ةقيرط مادختساب رتمونان تاجولما قيرط نع ديدحلا تارتن زيكرت رييغت مادختسابو ،ةيتوصلا ،  مت تحضو سكإ ةعشأ دويح جئاتن .ةيبيكرتلاو ةيئوضلا صاوخلا يف مكحتلا عون نم ونانلا مجح يف تابيبح نم نوكمو ةرولبلا يلاع جتنلما نأ تدكأو نيب حوارتي ناك تابيبحلا مجح .تيتامهلا 4 8  ةيرارحلا ةجلاعلمابو ،رتمونان ةدايز مت ىدم يف نوكتل تارولبلا مجح 6  10  ةيئوضلا تاسايقلا .رتمونان ةيونانلا تابيبحلل ةوجفلا ةقاط نأ ترهظأ 2.67  .تلوف نورتكلإ ىلإ ةوجفلا ةقاط ليلقت مت ،ديدحلا تارتن زيكرت يف مكحتلابو 2.46  نأ ترهظأ حسالما ينورتكللإا بوكسوركيلما جئاتن .تلوف نورتكلإ ل ةيونانلا تابيبحلا ةيونانلا تابيبحلا مجح نأ تدكأو يرئاد لكش اه نيب اهب مكحتلا نكمي 6  ىلإ رتمونان 10  يف .تازيكرتلا ىلع ادامتعا رتمونان يف ةديفم نوكت ءارضخلا ريضحتلا قرط نأ صلاختسا نكمي ،ةياهنلا يلاتلابو ةيسيطانغلما ةيونانلا تابيكرتلل ةيفيظولا صاوخلا يف مكحتلا يبطتل ةحاتم نوكت ةعساو ةيعانص تاق .  ABSTRACT The current study focuses on a dual aim of developing an easy method to synthesise monodisperse hematite iron oxide (α-Fe2O3) nanoparticles and controlling their optical, structural and morphological properties. By using a low-cost and eco-friendly room temperature sonication method, a series of iron oxide nanoparticles were prepared on a nano scale, with fine sizes ranging from 4–10 nm. Optical, structural and morphological properties were precisely modified by varying the concentration of the solution of iron chloride (0.01 M, 0.02 M and 0.05 M). X-ray diffraction and Raman spectra revealed that the prepared nanoparticles had a high crystallinity, confirming that they were hematite. The nanoparticles' crystallite sizes increased from 6 to 10 nm with solution molarity. The optical measurements showed that the band gap energy of α-Fe2O3 nanoparticles (annealed) decreased from 2.67 eV to 2.46 eV with the increasing of solution molarity from 0.01 M to 0.05 M, respectively. Results of field emission scanning electron microscopy demonstrated that the α-Fe2O3 nanoparticles appeared as spherical dots, and their sizes increased from 6 to 10 nm with the concentration of the solution. The presented green synthesis might be useful in controlling the functional properties of magnetic nanostructures for a variety of applications.

Tuning of Morphological, Structural and Optical Properties of α-Fe2O3 Nanoparticles by Precursor Concentration