Кл.слова (ненормированные):
Agglomeration -- Crystal impurities -- Fourier transform infrared spectroscopy -- High resolution transmission electron microscopy -- Magnetic properties -- Magnetite -- Magnetization -- Nanomagnetics -- Sulfur compounds -- Synthesis (chemical) -- Thermogravimetric analysis -- Thermolysis -- Electron diffraction analysis -- Greigites -- Hexadecylamine -- Inverse spinel structures -- Iron sulfide -- Isostructural -- Octadecyl amine -- Organic shells -- Structures phase -- Synthesised -- Surface active agents
Аннотация: The effect of surfactants on the structure, morphology, and magnetic properties of FexSy iron-sulfide nanoparticles synthesized by thermal decomposition is studied. Oleylamine, hexadecylamine, and octadecylamine are used as surfactants. It is established by X-ray and electron-diffraction analysis combined with Mossbauer spectroscopy that, in samples 1 and 2 prepared using oleylamine and hexadecylamine, respectively, the Fe3S4 greigite phase dominates, with an inverse spinel structure isostructural to the iron oxide Fe3O4 magnetite with minor Fe9S11 impurities. Deviations in the distribution of iron cations over the tetrahedral and octahedral sites relative to the bulk greigite crystals are observed. The nanoparticles synthesized using octadecylamine (sample 3) are found to be multiphase with a greigite fraction of ~20%. In all three cases, as showed the results of transmission electron microscopy and Fourier transform infrared spectroscopy together with thermogravimetry analysis, the magnetic nanoparticles have an organic shell chemically bonded to their magnetic core, which prevents the agglomeration of the particles. This shell is much more massive in samples 2 and 3. The magnetization values for samples 1 and 2 are similar to those of greigite nanoparticles reported in publications, while the magnetization of sample 3 is several times lower, in accordance with the greigite fraction in it. The combination of fairly high magnetization with a massive organic shell allows one to consider hexadecylamine to be a promising surfactant for the synthesis of iron-sulfide nanoparticles protected from external impact and agglomeration.
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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Department of Applied Physics, National Pingtung University, Pingtung City, 90003, Taiwan
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Доп.точки доступа:
Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Lin, C. -R.; Chen, Y. -Z.; Ivanova, O. S.; Иванова, Оксана Станиславовна; Altunin, R. R.; Knyazev, Yu. V.; Князев, Юрий Владимирович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Shestakov, N. P.; Шестаков, Николай Петрович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Edelman, I. S.; Эдельман, Ирина Самсоновна