Structural, magnetic and hyperfine characterization of Zn x Fe 3–x O 4 nanoparticles prepared by sol-gel approach via inorganic precursors
| Autor: | Vladimir Pankov, Konstantin V. Pokholok, Dmitry Filimonov, Elena Petrova, V.O. Natarov, D. Kotsikau |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Analytical chemistry Nanoparticle Infrared spectroscopy 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Magnetization Transmission electron microscopy 0103 physical sciences Mössbauer spectroscopy Magnetic nanoparticles Physical chemistry General Materials Science 010306 general physics 0210 nano-technology Sol-gel Superparamagnetism |
| Zdroj: | Journal of Physics and Chemistry of Solids. 114:64-70 |
| ISSN: | 0022-3697 |
| DOI: | 10.1016/j.jpcs.2017.11.004 |
| Popis: | Structural characteristics and magnetic properties of ZnxFe3–xO4 (where х = 0; 0.09; 0.18; 0.45; 1) nanoparticles were studied with X-ray diffraction (XRD), transmission electron microscopy (TEM), infrared spectroscopy (IR) and vibrating sample magnetometry (VSM). Oxidation of Fe2+ ions, redistribution of Zn2+ and Fe3+ ions between octahedral and tetrahedral sites, and the formation of cation vacancies in spinel-type cubic structure of the obtained ZnxFe3–x–y□yO4 substitutional solid solutions were revealed by 57Fe Mossbauer spectroscopy. The nanoparticles synthesized via a modified sol-gel method using inorganic precursors have a size of 4–10 nm, single-phase composition, superparamagnetic behavior at room temperature (300 K) and a relatively hydrophilic surface to form stable aqueous suspensions. The maximum magnetization of 59 emu/g at 300 K corresponds to Zn0.18Fe2.82O4 composition. The listed features make the materials promising candidates for various biological and medical applications such as contrast-enhanced magnetic resonance imaging, hyperthermia of pathological tissues, controlled drug release, and separation of nucleic acids. |
| Databáze: | OpenAIRE |
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