Exchange-coupled Fe3O4/CoFe2O4 nanoparticles for advanced magnetic hyperthermia | Zendy

J.M. Almanza-Robles | Zendy; Raja Das | Zendy; M. Glassell | Zendy; ManhHuong Phan | Zendy; H. Srikanth | Zendy

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Exchange-coupled Fe₃O₄/CoFe₂O₄ nanoparticles for advanced magnetic hyperthermia

Author(s) -

J.M. Almanza-Robles,

Raja Das,

M. Glassell,

ManhHuong Phan,

H. Srikanth

Publication year - 2018

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.5007249

Subject(s) - nanoparticle , coercivity , materials science , magnetic nanoparticles , transmission electron microscopy , thermal decomposition , magnetization , analytical chemistry (journal) , saturation (graph theory) , magnetic hyperthermia , specific absorption rate , nuclear magnetic resonance , nanotechnology , magnetic field , condensed matter physics , chemistry , telecommunications , mathematics , organic chemistry , chromatography , quantum mechanics , combinatorics , antenna (radio) , computer science , physics

We report a systematic study of the effects of core and shell size on the magnetic properties and heating efficiency of exchange-coupled Fe3O4/CoFe2O4 core/shell nanoparticles. The nanoparticles were synthesized using thermal decomposition of organometallic precursors. Transmission electron microscopy (TEM) confirmed the formation of spherical Fe3O4 and Fe3O4/CoFe2O4 nanoparticles. Magnetic measurements showed high saturation magnetization for the nanoparticles at room temperature. Increasing core diameter (6.4±0.7, 7.8±0.1, 9.6±1.2 nm) and/or shell thickness (∼1, 2, 4 nm) increased the coercive field (HC), while an optimal value of saturation magnetization (MS) was achieved for the Fe3O4 (7.8±0.1nm)/CoFe2O4 (2.1±0.1nm) nanoparticles. Magnetic hyperthermia measurements indicated a large increase in specific absorption rate (SAR) for 8.2±1.1 nm Fe3O4/CoFe2O4 compared to Fe3O4 nanoparticles of same size. The SAR of the Fe3O4/CoFe2O4 nanoparticles increased from 199 to 461 W/g for 800 Oe as the thickness of ...

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