Influence of annealing temperature of α- Fe2O3 nanoparticles on Structure and Optical Properties
This work has been focused on the synthesis of the raw materials iron oxide nanoparticles; hematite (α -Fe2O3) from Iron (II) chloride tetra hydrate (FeCl2-4H2O) and iron (III) chloride hexahydrate (FeCl3-6H2O) using Solid State Chemical Reaction technique. Nanostructure powders were characterized...
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| Format: | Article |
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Ain Shams University, Faculty of Women for Arts, Science & Education
2020-12-01
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| Series: | Journal of Scientific Research in Science |
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| Online Access: | https://jsrs.journals.ekb.eg/article_129917.html |
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| author | Eman. K Tawfik Wael H.Eisa N. Okasha H.A.ashry |
| author_facet | Eman. K Tawfik Wael H.Eisa N. Okasha H.A.ashry |
| author_sort | Eman. K Tawfik |
| collection | DOAJ |
| description | This work has been focused on the synthesis of the raw materials iron oxide nanoparticles; hematite (α -Fe2O3) from Iron (II) chloride tetra hydrate (FeCl2-4H2O) and iron (III) chloride hexahydrate (FeCl3-6H2O) using Solid State Chemical Reaction technique. Nanostructure powders were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), and UV-visible spectroscopy. XRD confirmed the formation of crystalline α -Fe2O3 nanostructured and its average crystallite size increased from ~ 12 to 28 nm with increasing annealing temperature from 200 up to 80℃ while SEM confirmed the morphology and the purity of the sample was evaluated from the energy dispersive spectrum (EDS). Moreover, strain decreased with increasing annealing temperature. UV-visible characterization indicated the existence of both direct and indirect band gap in the samples. All The annealed samples showed the direct band gap at ~ 2.21 eV. However, the indirect band gap increased from 1.6 to 1.94 eV when the annealing temperature increased from 200 up to 700℃ and remained almost the same for sample annealed at 800℃. The observed values of optical band gaps were in close agreement with the reported values. Our results indicated that the annealing would give rise to a good crystalline α -Fe2O3 nanoparticles with reduced strain. |
| first_indexed | 2024-03-12T13:21:04Z |
| format | Article |
| id | doaj.art-14ebd9ebf68e43f5b67040ef69b574a0 |
| institution | Directory Open Access Journal |
| issn | 2356-8364 2356-8372 |
| language | English |
| last_indexed | 2024-03-12T13:21:04Z |
| publishDate | 2020-12-01 |
| publisher | Ain Shams University, Faculty of Women for Arts, Science & Education |
| record_format | Article |
| series | Journal of Scientific Research in Science |
| spelling | doaj.art-14ebd9ebf68e43f5b67040ef69b574a02023-08-25T21:53:51ZengAin Shams University, Faculty of Women for Arts, Science & EducationJournal of Scientific Research in Science2356-83642356-83722020-12-013717391doi:10.21608/JSRS.2020.129917Influence of annealing temperature of α- Fe2O3 nanoparticles on Structure and Optical PropertiesEman. K Tawfik0Wael H.Eisa1N. Okasha2H.A.ashry3Radiation Physics Department, National Centre for Radiation Research and Technology(NCRT), Atomic Energy Authority (AEA), Nasr City, Cairo, Egypt.Spectroscopy Department, Physics Division, National Research Centre (NRC), Egypt.Physics Department, Faculty of Women, Ain Shams University, Cairo, Egypt.Radiation Physics Department, National Centre for Radiation Research and Technology(NCRT), Atomic Energy Authority (AEA), Nasr City, Cairo, Egypt.This work has been focused on the synthesis of the raw materials iron oxide nanoparticles; hematite (α -Fe2O3) from Iron (II) chloride tetra hydrate (FeCl2-4H2O) and iron (III) chloride hexahydrate (FeCl3-6H2O) using Solid State Chemical Reaction technique. Nanostructure powders were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), and UV-visible spectroscopy. XRD confirmed the formation of crystalline α -Fe2O3 nanostructured and its average crystallite size increased from ~ 12 to 28 nm with increasing annealing temperature from 200 up to 80℃ while SEM confirmed the morphology and the purity of the sample was evaluated from the energy dispersive spectrum (EDS). Moreover, strain decreased with increasing annealing temperature. UV-visible characterization indicated the existence of both direct and indirect band gap in the samples. All The annealed samples showed the direct band gap at ~ 2.21 eV. However, the indirect band gap increased from 1.6 to 1.94 eV when the annealing temperature increased from 200 up to 700℃ and remained almost the same for sample annealed at 800℃. The observed values of optical band gaps were in close agreement with the reported values. Our results indicated that the annealing would give rise to a good crystalline α -Fe2O3 nanoparticles with reduced strain. https://jsrs.journals.ekb.eg/article_129917.htmlhematite; xrd; eds; sem; strain; optical properties. |
| spellingShingle | Eman. K Tawfik Wael H.Eisa N. Okasha H.A.ashry Influence of annealing temperature of α- Fe2O3 nanoparticles on Structure and Optical Properties Journal of Scientific Research in Science hematite; xrd; eds; sem; strain; optical properties. |
| title | Influence of annealing temperature of α- Fe2O3 nanoparticles on Structure and Optical Properties |
| title_full | Influence of annealing temperature of α- Fe2O3 nanoparticles on Structure and Optical Properties |
| title_fullStr | Influence of annealing temperature of α- Fe2O3 nanoparticles on Structure and Optical Properties |
| title_full_unstemmed | Influence of annealing temperature of α- Fe2O3 nanoparticles on Structure and Optical Properties |
| title_short | Influence of annealing temperature of α- Fe2O3 nanoparticles on Structure and Optical Properties |
| title_sort | influence of annealing temperature of α fe2o3 nanoparticles on structure and optical properties |
| topic | hematite; xrd; eds; sem; strain; optical properties. |
| url | https://jsrs.journals.ekb.eg/article_129917.html |
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