Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.1088/1361-6528/ab9af2

Ключевые слова: core-shell nanoparticles, iron oxides, carbon shell, ag nanoparticles, core shell nanoparticles

Аннотация: Core-shell FexOy@C nanoparticles (NPs) modified with Ag were studied with x-ray diffraction, transmission electron microscopy, energy dispersive elemental mapping, Mossbauer spectroscopy, static magnetic measurements, and optical magnetic circular dichroism (MCD). FexOy@C NPs synthesized by the pyrolysis process of the mixture of Fe(NO3)(3)center dot 9H(2)O with oleylamine and oleic acid were added to a heated mixture of oleylamine and AgNO(3)in different concentrations. The final product was a mixture of iron oxide crystalline NPs in an amorphous carbon shell and Ag crystalline NPs. The iron oxide NPs were presented by two magnetic phases with extremely close crystal structures: Fe(3)O(4)and gamma-Fe2O3. Ag is shown to form crystalline NPs located very close to the iron oxide NPs. An assumption is made about the formation of hybrid FexOy@C-Ag NPs. Correlations were obtained between the Ag concentration in the fabricated samples, their magnetic properties and the MCD spectrum shape. Introducing Ag led to a approximately linear decrease of the NPs saturation magnetization depending upon the Ag concentration, it also resulted into the MCD spectrum shift to the lower light wave energies. MCD was also studied for the Fe3O4@C NPs synthesized earlier with the same one-step process using different heat treatment temperatures, and MCD spectra were compared for two series of NPs. A possible contribution of the surface plasmon excitation in Ag NPs to the MCD spectrum of the FexOy@C-Ag NPs is discussed.

Журнал: NANOTECHNOLOGY

Выпуск журнала: Vol. 31, Is. 39

ISSN журнала: 09574484

Место издания: BRISTOL395703

Издатель: IOP PUBLISHING LTD

• Petrov D.A. (SB RAS, KSC, FRC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia)
• Lin C.-R (Natl Pingtung Univ, Pingtung 90003, Pingtung County, Taiwan)
• Ivantsov R.D. (SB RAS, KSC, FRC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia)
• Ovchinnikov S.G. (SB RAS, KSC, FRC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Svobodny Ave 79, Krasnoyarsk 660041, Russia)
• Zharkov S.M. (SB RAS, KSC, FRC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Svobodny Ave 79, Krasnoyarsk 660041, Russia)
• Yurkin G.Y. (SB RAS, KSC, FRC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Svobodny Ave 79, Krasnoyarsk 660041, Russia)
• Velikanov D.A. (SB RAS, KSC, FRC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia)
• Knyazev Y.V (SB RAS, KSC, FRC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Svobodny Ave 79, Krasnoyarsk 660041, Russia)
• Molokeev M.S. (SB RAS, KSC, FRC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Svobodny Ave 79, Krasnoyarsk 660041, Russia)
• Tseng Y.-T (Natl Pingtung Univ, Pingtung 90003, Pingtung County, Taiwan)
• Lin E.-S (Natl Pingtung Univ, Pingtung 90003, Pingtung County, Taiwan)
• Edelman I.S. (SB RAS, KSC, FRC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia)
• Baskakov A.O. (RAS, Shubnikov Inst Crystallog FSRC Crystallog & Photo, Moscow 119333, Russia)
• Starchikov S.S. (RAS, Shubnikov Inst Crystallog FSRC Crystallog & Photo, Moscow 119333, Russia)
• Lyubutin I.S. (RAS, Shubnikov Inst Crystallog FSRC Crystallog & Photo, Moscow 119333, Russia)

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