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Characterization of the iron oxide phases formed during the synthesis of core–shell FexOy@C nanoparticles modified with Ag.

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Title: Characterization of the iron oxide phases formed during the synthesis of core–shell FexOy@C nanoparticles modified with Ag.
Authors: Petrov, D A (AUTHOR) irbiz@iph.krasn.ru, Lin, C -R (AUTHOR) crlinspin@gmail.com, Ivantsov, R D (AUTHOR), Ovchinnikov, S G (AUTHOR), Zharkov, S M (AUTHOR), Yurkin, G Y (AUTHOR), Velikanov, D A (AUTHOR), Knyazev, Y V (AUTHOR), Molokeev, M S (AUTHOR), Tseng, Y -T (AUTHOR), Lin, E -S (AUTHOR), Edelman, I S (AUTHOR), Baskakov, A O (AUTHOR), Starchikov, S S (AUTHOR), Lyubutin, I S (AUTHOR)
Source: Nanotechnology. 9/25/2020, Vol. 31 Issue 39, p1-12. 12p.
Subjects: Iron oxide nanoparticles, Ferric oxide, Nanoparticles, Magnetic circular dichroism, Iron oxides, Mössbauer spectroscopy, Transmission electron microscopy
Abstract: Core–shell FexOy@C nanoparticles (NPs) modified with Ag were studied with x-ray diffraction, transmission electron microscopy, energy dispersive elemental mapping, Mössbauer 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 · 9H2O with oleylamine and oleic acid were added to a heated mixture of oleylamine and AgNO3 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: Fe3O4 and γ-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. [ABSTRACT FROM AUTHOR]
Copyright of Nanotechnology is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Characterization of the iron oxide phases formed during the synthesis of core–shell Fe<subscript>x</subscript>O<subscript>y</subscript>@C nanoparticles modified with Ag.
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  Data: <searchLink fieldCode="AR" term="%22Petrov%2C+D+A%22">Petrov, D A</searchLink> (AUTHOR)<i> irbiz@iph.krasn.ru</i><br /><searchLink fieldCode="AR" term="%22Lin%2C+C+-R%22">Lin, C -R</searchLink> (AUTHOR)<i> crlinspin@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Ivantsov%2C+R+D%22">Ivantsov, R D</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ovchinnikov%2C+S+G%22">Ovchinnikov, S G</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zharkov%2C+S+M%22">Zharkov, S M</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yurkin%2C+G+Y%22">Yurkin, G Y</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Velikanov%2C+D+A%22">Velikanov, D A</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Knyazev%2C+Y+V%22">Knyazev, Y V</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Molokeev%2C+M+S%22">Molokeev, M S</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tseng%2C+Y+-T%22">Tseng, Y -T</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lin%2C+E+-S%22">Lin, E -S</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Edelman%2C+I+S%22">Edelman, I S</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Baskakov%2C+A+O%22">Baskakov, A O</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Starchikov%2C+S+S%22">Starchikov, S S</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lyubutin%2C+I+S%22">Lyubutin, I S</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Nanotechnology%22">Nanotechnology</searchLink>. 9/25/2020, Vol. 31 Issue 39, p1-12. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Iron+oxide+nanoparticles%22">Iron oxide nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Ferric+oxide%22">Ferric oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Nanoparticles%22">Nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+circular+dichroism%22">Magnetic circular dichroism</searchLink><br /><searchLink fieldCode="DE" term="%22Iron+oxides%22">Iron oxides</searchLink><br /><searchLink fieldCode="DE" term="%22Mössbauer+spectroscopy%22">Mössbauer spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink>
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  Data: Core–shell FexOy@C nanoparticles (NPs) modified with Ag were studied with x-ray diffraction, transmission electron microscopy, energy dispersive elemental mapping, Mössbauer 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 · 9H2O with oleylamine and oleic acid were added to a heated mixture of oleylamine and AgNO3 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: Fe3O4 and γ-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. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Nanotechnology is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1088/1361-6528/ab9af2
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      – Code: eng
        Text: English
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        PageCount: 12
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    Subjects:
      – SubjectFull: Iron oxide nanoparticles
        Type: general
      – SubjectFull: Ferric oxide
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      – SubjectFull: Nanoparticles
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      – SubjectFull: Magnetic circular dichroism
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      – SubjectFull: Iron oxides
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      – SubjectFull: Mössbauer spectroscopy
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      – SubjectFull: Transmission electron microscopy
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