Hard–Soft Core–Shell Architecture Formation from Cubic Cobalt Ferrite Nanoparticles
Cubic bi-magnetic hard–soft core–shell nanoarchitectures were prepared starting from cobalt ferrite nanoparticles, prevalently with cubic shape, as seeds to grow a manganese ferrite shell. The combined use of direct (nanoscale chemical mapping via STEM-EDX) and indirect (DC magnetometry) tools was a...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-05-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/10/1679 |
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| author | Marco Sanna Angotzi Valentina Mameli Dominika Zákutná Fausto Secci Huolin L. Xin Carla Cannas |
| author_facet | Marco Sanna Angotzi Valentina Mameli Dominika Zákutná Fausto Secci Huolin L. Xin Carla Cannas |
| author_sort | Marco Sanna Angotzi |
| collection | DOAJ |
| description | Cubic bi-magnetic hard–soft core–shell nanoarchitectures were prepared starting from cobalt ferrite nanoparticles, prevalently with cubic shape, as seeds to grow a manganese ferrite shell. The combined use of direct (nanoscale chemical mapping via STEM-EDX) and indirect (DC magnetometry) tools was adopted to verify the formation of the heterostructures at the nanoscale and bulk level, respectively. The results showed the obtainment of core–shell NPs (CoFe<sub>2</sub>O<sub>4</sub>@MnFe<sub>2</sub>O<sub>4</sub>) with a thin shell (heterogenous nucleation). In addition, manganese ferrite was found to homogeneously nucleate to form a secondary nanoparticle population (homogenous nucleation). This study shed light on the competitive formation mechanism of homogenous and heterogenous nucleation, suggesting the existence of a critical size, beyond which, phase separation occurs and seeds are no longer available in the reaction medium for heterogenous nucleation. These findings may allow one to tailor the synthesis process in order to achieve better control of the materials’ features affecting the magnetic behaviour, and consequently, the performances as heat mediators or components for data storage devices. |
| first_indexed | 2024-03-11T03:26:47Z |
| format | Article |
| id | doaj.art-cd7d1f7696f5499a88f4efb96207c9ae |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-11T03:26:47Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-cd7d1f7696f5499a88f4efb96207c9ae2023-11-18T02:43:09ZengMDPI AGNanomaterials2079-49912023-05-011310167910.3390/nano13101679Hard–Soft Core–Shell Architecture Formation from Cubic Cobalt Ferrite NanoparticlesMarco Sanna Angotzi0Valentina Mameli1Dominika Zákutná2Fausto Secci3Huolin L. Xin4Carla Cannas5Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria S.S. 554 Bivio per Sestu, 09042 Monserrato, ItalyDepartment of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria S.S. 554 Bivio per Sestu, 09042 Monserrato, ItalyDepartment of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech RepublicDepartment of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria S.S. 554 Bivio per Sestu, 09042 Monserrato, ItalyDepartment of Physics and Astronomy, University of California, Irvine, CA 92617, USADepartment of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria S.S. 554 Bivio per Sestu, 09042 Monserrato, ItalyCubic bi-magnetic hard–soft core–shell nanoarchitectures were prepared starting from cobalt ferrite nanoparticles, prevalently with cubic shape, as seeds to grow a manganese ferrite shell. The combined use of direct (nanoscale chemical mapping via STEM-EDX) and indirect (DC magnetometry) tools was adopted to verify the formation of the heterostructures at the nanoscale and bulk level, respectively. The results showed the obtainment of core–shell NPs (CoFe<sub>2</sub>O<sub>4</sub>@MnFe<sub>2</sub>O<sub>4</sub>) with a thin shell (heterogenous nucleation). In addition, manganese ferrite was found to homogeneously nucleate to form a secondary nanoparticle population (homogenous nucleation). This study shed light on the competitive formation mechanism of homogenous and heterogenous nucleation, suggesting the existence of a critical size, beyond which, phase separation occurs and seeds are no longer available in the reaction medium for heterogenous nucleation. These findings may allow one to tailor the synthesis process in order to achieve better control of the materials’ features affecting the magnetic behaviour, and consequently, the performances as heat mediators or components for data storage devices.https://www.mdpi.com/2079-4991/13/10/1679cobalt ferritecore–shellheterostructurescubic shapeSTEM-EDX |
| spellingShingle | Marco Sanna Angotzi Valentina Mameli Dominika Zákutná Fausto Secci Huolin L. Xin Carla Cannas Hard–Soft Core–Shell Architecture Formation from Cubic Cobalt Ferrite Nanoparticles Nanomaterials cobalt ferrite core–shell heterostructures cubic shape STEM-EDX |
| title | Hard–Soft Core–Shell Architecture Formation from Cubic Cobalt Ferrite Nanoparticles |
| title_full | Hard–Soft Core–Shell Architecture Formation from Cubic Cobalt Ferrite Nanoparticles |
| title_fullStr | Hard–Soft Core–Shell Architecture Formation from Cubic Cobalt Ferrite Nanoparticles |
| title_full_unstemmed | Hard–Soft Core–Shell Architecture Formation from Cubic Cobalt Ferrite Nanoparticles |
| title_short | Hard–Soft Core–Shell Architecture Formation from Cubic Cobalt Ferrite Nanoparticles |
| title_sort | hard soft core shell architecture formation from cubic cobalt ferrite nanoparticles |
| topic | cobalt ferrite core–shell heterostructures cubic shape STEM-EDX |
| url | https://www.mdpi.com/2079-4991/13/10/1679 |
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