Building Composite Fe-Mn Oxide Flower-Like Nanostructures: A Detailed Magnetic Study

Handle URI:
http://hdl.handle.net/10754/625697
Title:
Building Composite Fe-Mn Oxide Flower-Like Nanostructures: A Detailed Magnetic Study
Authors:
Zuddas, Efisio; Lentijo Mozo, Sergio; Casu, Alberto; Deiana, Davide; Falqui, Andrea ( 0000-0002-1476-7742 )
Abstract:
Here we show that it’s possible to produce different magnetic core-multiple shells heterostructures from monodispersed iron oxide spherical magnetic seeds by finely controlling the amount of a manganese precursor and using in a smart and simple way a cation exchange synthetic approach. In particular, by increasing the amount of precursor we were able to produce nanostructures ranging from Fe3O4/Mn-ferrite core/single shell nanospheres to larger, flower-like Fe3O4/Mn-ferrite/Mn3O4 core-double shell nanoparticles. We first demonstrate how the formation of the initial thin manganese-ferrite shell determines a dramatic reduction of the superficial disorder in the starting iron oxide, bringing to nanomagnets with lower hardness. Then, the growth of the second and most external manganese oxide shell causes the magnetical hardening of the heterostructures, while its magnetic exchange coupling with the rest of the heterostructure can be antiferromagentic or ferromagnetic, depending on the strength of the applied external magnetic field. This response is similar to that of an iron oxide-manganese oxide core-shell system but differs from what observed in multiple-shell heterostructures. Finally, we report as the most external shell becomes magnetically irrelevant above the ferrimagnetic-paramagnetic transition of the manganese oxide and the resulting magnetic behavior of the flower-like structures is then studied in-depth.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division
Citation:
Zuddas E, Lentijo-Mozo S, Casu A, Deiana D, Falqui A (2017) Building Composite Iron–Manganese Oxide Flowerlike Nanostructures: A Detailed Magnetic Study. The Journal of Physical Chemistry C 121: 17005–17015. Available: http://dx.doi.org/10.1021/acs.jpcc.7b04915.
Publisher:
American Chemical Society (ACS)
Journal:
The Journal of Physical Chemistry C
Issue Date:
21-Jul-2017
DOI:
10.1021/acs.jpcc.7b04915
Type:
Article
ISSN:
1932-7447; 1932-7455
Sponsors:
The authors acknowledge financial support from the King Abdullah University of Science and Technology (KAUST) start-up and baseline funding of Prof. Andrea Falqui. TOC was produced by Heno Hwang, scientific illustrator at KAUST.
Additional Links:
http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.7b04915
Appears in Collections:
Articles; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorZuddas, Efisioen
dc.contributor.authorLentijo Mozo, Sergioen
dc.contributor.authorCasu, Albertoen
dc.contributor.authorDeiana, Davideen
dc.contributor.authorFalqui, Andreaen
dc.date.accessioned2017-10-03T12:49:34Z-
dc.date.available2017-10-03T12:49:34Z-
dc.date.issued2017-07-21en
dc.identifier.citationZuddas E, Lentijo-Mozo S, Casu A, Deiana D, Falqui A (2017) Building Composite Iron–Manganese Oxide Flowerlike Nanostructures: A Detailed Magnetic Study. The Journal of Physical Chemistry C 121: 17005–17015. Available: http://dx.doi.org/10.1021/acs.jpcc.7b04915.en
dc.identifier.issn1932-7447en
dc.identifier.issn1932-7455en
dc.identifier.doi10.1021/acs.jpcc.7b04915en
dc.identifier.urihttp://hdl.handle.net/10754/625697-
dc.description.abstractHere we show that it’s possible to produce different magnetic core-multiple shells heterostructures from monodispersed iron oxide spherical magnetic seeds by finely controlling the amount of a manganese precursor and using in a smart and simple way a cation exchange synthetic approach. In particular, by increasing the amount of precursor we were able to produce nanostructures ranging from Fe3O4/Mn-ferrite core/single shell nanospheres to larger, flower-like Fe3O4/Mn-ferrite/Mn3O4 core-double shell nanoparticles. We first demonstrate how the formation of the initial thin manganese-ferrite shell determines a dramatic reduction of the superficial disorder in the starting iron oxide, bringing to nanomagnets with lower hardness. Then, the growth of the second and most external manganese oxide shell causes the magnetical hardening of the heterostructures, while its magnetic exchange coupling with the rest of the heterostructure can be antiferromagentic or ferromagnetic, depending on the strength of the applied external magnetic field. This response is similar to that of an iron oxide-manganese oxide core-shell system but differs from what observed in multiple-shell heterostructures. Finally, we report as the most external shell becomes magnetically irrelevant above the ferrimagnetic-paramagnetic transition of the manganese oxide and the resulting magnetic behavior of the flower-like structures is then studied in-depth.en
dc.description.sponsorshipThe authors acknowledge financial support from the King Abdullah University of Science and Technology (KAUST) start-up and baseline funding of Prof. Andrea Falqui. TOC was produced by Heno Hwang, scientific illustrator at KAUST.en
dc.publisherAmerican Chemical Society (ACS)en
dc.relation.urlhttp://pubs.acs.org/doi/abs/10.1021/acs.jpcc.7b04915en
dc.titleBuilding Composite Fe-Mn Oxide Flower-Like Nanostructures: A Detailed Magnetic Studyen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.identifier.journalThe Journal of Physical Chemistry Cen
dc.contributor.institutionCentre Interdisciplinaire de Microscopie Électronique (CIME), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerlanden
kaust.authorZuddas, Efisioen
kaust.authorLentijo Mozo, Sergioen
kaust.authorCasu, Albertoen
kaust.authorFalqui, Andreaen
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