Tailoring defects and nanocrystal transformation for optimal heating power in bimagnetic CoyFe1−yO@CoxFe3−xO4particles

Antonaropoulos, George; Vasilakaki, Marianna; Trohidou, K. N.; Iannotti, V.; Ausanio, G.; Abeykoon, Milinda; Božin, Emil S.; Lappas, Alexandros

doi:10.1039/d1nr05172e

Cited by 6 publications

(8 citation statements)

References 86 publications

(159 reference statements)

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“…EB is an interfacial coupling effect between the F(i)M and AFM, which can lead to changes in the coercivity of the MNOs. These effects have been studied in Co/CoO formed by controlled oxidation; − Fe 3–d O 4 /CoO − and CoFe 2 O 3 /CoO produced by seed-mediated growth; and FeO/Fe 3 O 4 , − MnO/Mn 3 O 4 , CoO/Fe 3 O 4 , CoO/CoFe 2 O 4 , CoO/Co 1– x Zn x Fe 2 O 4 , and Co y Fe 1– y O/Co x Fe 3– x O 4 synthesized by a variety of colloidal methodologies. Despite some fundamental studies on these materials, no new technologies have emerged to utilize this type of exchange coupling in MNOs.…”

Section: Introductionmentioning

confidence: 99%

Thermosensitivity through Exchange Coupling in Ferrimagnetic/Antiferromagnetic Nano-Objects for Magnetic-Based Thermometry

Abel

Correa

Biacchi

et al. 2023

ACS Appl. Mater. Interfaces

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Temperature is a fundamental physical quantity important to the physical and biological sciences. Measurement of temperature within an optically inaccessible three-dimensional (3D) volume at microscale resolution is currently limited. Thermal magnetic particle imaging (T-MPI), a temperature variant of magnetic particle imaging (MPI), hopes to solve this deficiency. For this thermometry technique, magnetic nano-objects (MNOs) with strong temperature-dependent magnetization (thermosensitivity) around the temperature of interest are required; here, we focus between 200 K and 310 K. We demonstrate that thermosensitivity can be amplified in MNOs consisting of ferrimagnetic (FiM) iron oxide (ferrite) and antiferromagnetic (AFM) cobalt oxide (CoO) through interface effects. The FiM/ AFM MNOs are characterized by X-ray diffraction (XRD), (scanning) transmission electron microscopy (STEM/TEM), dynamic light scattering (DLS), and Raman spectroscopy. Thermosensitivity is evaluated and quantified by temperature-dependent magnetic measurements. The FiM/AFM exchange coupling is confirmed by field-cooled (FC) hysteresis loops measured at 100 K. Magnetic particle spectroscopy (MPS) measurements were performed at room temperature to evaluate the MNOs MPI response. This initial study shows that FiM/AFM interfacial magnetic coupling is a viable method to increase thermosensitivity in MNOs for T-MPI.

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Section: Introductionmentioning

confidence: 99%

Thermosensitivity through Exchange Coupling in Ferrimagnetic/Antiferromagnetic Nano-Objects for Magnetic-Based Thermometry

Abel

Correa

Biacchi

et al. 2023

ACS Appl. Mater. Interfaces

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“…, rich active sites, p-type conductivity, optical transparency, magnetic properties, semiconductivity, multiple valence states of their oxides, and redox properties). 21–28 For the production cost, spinel-type TMO nanocatalysts are easily prepared from inexpensive and Earth-abundant precursors. 29–31 Moreover, spinel-type TMO nanocatalysts are easily stored and handled during preparation, making the production cycle more cost-effective relative to state-of-the-art noble metal catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…, nanocubes and polyhedral), have been developed for ORRs. 21–27,32 Thus, spinel-type TMO nanocatalysts have attracted significant attention for various electrocatalytic applications. Mainly, ∼307 articles were published in the last 10 years and cited 10 387 times (33.8 citations per article, Fig.…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17][18][19][20] Unlike precious metals, spinel-type transition metal oxide (TMO) nanocatalysts with stoichiometric or non-stoichiometric compositions are highly promising for ORRs due to their unique physicochemical merits (i.e., rich active sites, p-type conductivity, optical transparency, magnetic properties, semiconductivity, multiple valence states of their oxides, and redox properties). [21][22][23][24][25][26][27][28] For the production cost, spinel-type TMO nanocatalysts are easily prepared from inexpensive and Earth-abundant precursors. [29][30][31] Moreover, spinel-type TMO nanocatalysts are easily stored and handled during preparation, making the production cycle more cost-effective relative to state-of-the-art noble metal catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…Numerous spinel-type TMO nanocatalysts with distinct morphologies, including but not limited to 1D (i.e., nanoneedles, nanowires, and nanorods), 2D (i.e., nanosheets and flakes), and multi-dimensional (i.e., nanocubes and polyhedral), have been developed for ORRs. [21][22][23][24][25][26][27]32 Thus, spinel-type TMO nanocatalysts have attracted significant attention for various electrocatalytic applications. Mainly, ∼307 articles were published in the last 10 years and cited 10 387 times (33.8 citations per article, Fig.…”

Section: Introductionmentioning

confidence: 99%

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Porous spinel-type transition metal oxide nanostructures as emergent electrocatalysts for oxygen reduction reactions

et al. 2022

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Magnetic Coupling in Cobalt-Doped Iron Oxide Core–Shell Nanoparticles: Exchange Pinning through Epitaxial Alignment

et al. 2023

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Tuning the core–shell morphology of bimagnetic nanoparticles and its associated exchange bias behavior is a promising way to overcome the superparamagnetic limit and stabilize the particle moment in extended time and temperature ranges. The intraparticle magnetization distribution and magnetic coupling between the two phases, however, is still unclear. We report a significant nonzero magnetization in the Co x Fe(1–x)O core of native core–shell bimagnetic nanoparticles that is typically considered antiferro- or paramagnetic. Co0.14Fe0.86O@Co0.4Fe2.4O4 (6 nm@2 nm) and Co0.08Fe0.92O@Co0.58Fe2.28O4 (12 nm@2 nm) core–shell nanoparticles have been synthesized by thermal decomposition of a mixed cobalt–iron oleate with a similar Fe/Co distribution throughout the nanoparticle. We determine the exact phase composition and the magnetization distribution in the core and shell using a combination of X-ray and neutron small-angle scattering. Core and shell magnetization are traced separately with a varying magnetic field. Our results reveal that the magnetization of the core and the spinel-type shell phases are coupled at room temperature, i.e., rotating coherently with the magnetic field. This is a mandatory condition to observe a significant exchange bias effect at low temperatures. These findings highlight the enormous potential of finite size and exchange coupling in bimagnetic nanoparticles to control the magnetic properties via interface-induced magnetization.

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Tailoring defects and nanocrystal transformation for optimal heating power in bimagnetic Co_yFe_1−yO@Co_xFe_3−xO₄particles

Abstract: The effects of cobalt incorporation in spherical heterostructured iron oxide nanocrystals (NCs) of sub-critical size have been explored by colloidal chemistry methods. Synchrotron X-ray total scattering methods suggest that cobalt...

Cited by 6 publications

References 86 publications

Thermosensitivity through Exchange Coupling in Ferrimagnetic/Antiferromagnetic Nano-Objects for Magnetic-Based Thermometry

Thermosensitivity through Exchange Coupling in Ferrimagnetic/Antiferromagnetic Nano-Objects for Magnetic-Based Thermometry

Porous spinel-type transition metal oxide nanostructures as emergent electrocatalysts for oxygen reduction reactions

Magnetic Coupling in Cobalt-Doped Iron Oxide Core–Shell Nanoparticles: Exchange Pinning through Epitaxial Alignment

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