Synthesis process, size and composition effects of spherical Fe 3 O 4 and FeO@Fe 3 O 4 core/shell nanoparticles
| Autor: | Leandro M. Socolovsky, Pablo Tancredi, Bernd Rellinghaus, Volker Neu, Patricia C. Rivas Rojas, Marcelo Knobel, Christine Damm, Ulrike Wolff, Oscar Moscoso-Londoño |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Diffraction
magnetite Analytical chemistry 02 engineering and technology INGENIERÍAS Y TECNOLOGÍAS 010402 general chemistry 01 natural sciences Catalysis Monocrystalline silicon chemistry.chemical_compound Phase (matter) purl.org/becyt/ford/2.10 [https] Materials Chemistry Chemical synthesis Single domain Magnetite Nanotecnología Scattering Chemistry Iron nanoparticles General Chemistry 021001 nanoscience & nanotechnology Nano-materiales 0104 chemical sciences purl.org/becyt/ford/2 [https] Transmission electron microscopy 0210 nano-technology Iron oxide nanoparticles |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| Popis: | In this work, we investigate the size, composition and magnetic behavior of a series of iron oxide nanoparticles prepared by means of high temperature decomposition of an iron oleate precursor. Different synthesis conditions, such as gas atmosphere, precursor ratio and heating rate were tested to obtain a direct correlation between the final sample structure and the varied parameter. The synthesis products were characterized by X-ray diffraction, transmission electron microscopy and small-angle X-ray scattering, respectively. We studied six samples with rather narrow size distribution and mean diameters from 8 nm to 16 nm. The particles with diameter below 11 nm were found to be spinel-type, monocrystalline, and their magnetic response can be ascribed to a single domain framework. On the other hand, two-phase core–shell FeO@Fe3O4 of mean sizes of 15 nm and 16 nm were obtained by increasing the amount of oleic acid and the heating rate. The magnetic behavior of these samples exhibits interesting interface features, related to the exchange coupling phenomenon between the FeO and Fe3O4. We discuss how the different synthesis conditions may lead to the presence of this FeO phase, and how the core–shell configuration and other structural features affect the macroscopic magnetic behavior. Fil: Tancredi Gentili, Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Tecnologías y Ciencias de la Ingeniería "Hilario Fernández Long". Universidad de Buenos Aires. Facultad de Ingeniería. Instituto de Tecnologías y Ciencias de la Ingeniería "Hilario Fernández Long"; Argentina Fil: Rivas Rojas, Patricia Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Tecnologías y Ciencias de la Ingeniería "Hilario Fernández Long". Universidad de Buenos Aires. Facultad de Ingeniería. Instituto de Tecnologías y Ciencias de la Ingeniería "Hilario Fernández Long"; Argentina Fil: Moscoso Londoño, Oscar. Universidad Autónoma de Manizales; Colombia. Universidade Estadual de Campinas; Brasil. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Wolff, Ulrike. Leibniz Institute for Solid State and Materials Research Dresden; Alemania Fil: Neu, Volker. Leibniz Institute for Solid State and Materials Research Dresden; Alemania Fil: Damm, Christine. Leibniz Institute for Solid State and Materials Research Dresden; Alemania Fil: Rellinghaus, Bernd. Leibniz Institute for Solid State and Materials Research Dresden; Alemania Fil: Knobel, Marcelo. Universidade Estadual de Campinas; Brasil Fil: Socolovsky, Leandro Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Houssay. Instituto de Tecnologías y Ciencias de la Ingeniería "Hilario Fernández Long". Universidad de Buenos Aires. Facultad de Ingeniería. Instituto de Tecnologías y Ciencias de la Ingeniería "Hilario Fernández Long"; Argentina |
| Databáze: | OpenAIRE |
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