Structural, optical, magnetic and electrical properties of hematite (α-Fe2O3) nanoparticles synthesized by two methods: polyol and precipitation
| Autor: | Sonia De Almeida-Didry, Cécile Autret-Lambert, Salah Ammar, Hanen Letifi, Abdellatif Gadri, R. Bargougui, Houda Mansour, B. Negulescu |
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| Přispěvatelé: | GREMAN (matériaux, microélectronique, acoustique et nanotechnologies) (GREMAN - UMR 7347), Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), UREME (UR17ES45), Faculté des Sciences de Gabes - Tunisie, Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Diffuse reflectance infrared fourier transform Scanning electron microscope Analytical chemistry 02 engineering and technology 010402 general chemistry 01 natural sciences Magnetization symbols.namesake [CHIM]Chemical Sciences General Materials Science [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] ComputingMilieux_MISCELLANEOUS [PHYS]Physics [physics] Precipitation (chemistry) Hexagonal phase General Chemistry [CHIM.MATE]Chemical Sciences/Material chemistry Hematite 021001 nanoscience & nanotechnology 0104 chemical sciences Dielectric spectroscopy visual_art symbols visual_art.visual_art_medium [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] 0210 nano-technology Raman spectroscopy |
| Zdroj: | Applied physics. A, Materials science & processing Applied physics. A, Materials science & processing, Springer Verlag, 2017, 123 (12), ⟨10.1007/s00339-017-1408-1⟩ |
| ISSN: | 0947-8396 1432-0630 |
| Popis: | Hematite (α-Fe2O3) nanoparticles have been successfully synthesized via two methods: (1) polyol and (2) precipitation in water. The influence of synthesis methods on the crystalline structure, morphological, optical, magnetic and electrical properties were investigated using X-ray diffraction, RAMAN spectroscopy, scanning electron microscopy, transmission electron microscopy, UV–visible diffuse reflectance spectroscopy (UV–vis DRS), superconducting quantum interference device and impedance spectroscopy. The structural properties showed that the obtained hematite α-Fe2O3 nanoparticles with two preparation methods exhibit hexagonal phase with high crystallinity and high-phase stability at room temperature. It was found that the average hematite nanoparticle size is estimated to be 36.86 nm for the sample synthesized by precipitation and 54.14 nm for the sample synthesized by polyol. Moreover, the optical properties showed that the band gap energy value of α-Fe2O3 synthesized by precipitation (2.07 eV) was higher than that of α-Fe2O3 synthesized by polyol (1.97 eV) and they showed a red shift to the visible region. Furthermore, the measurements of magnetic properties indicated a magnetization loop typical of ferromagnetic systems at room temperature. Measurements of electrical properties show higher dielectric permittivity (5.64 × 103) and relaxation phenomenon for α-Fe2O3 issued from the precipitation method than the other sample. |
| Databáze: | OpenAIRE |
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