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Enhanced magnetic anisotropy and heating efficiency in multi-functional manganese ferrite/graphene oxide nanostructures

Abstract: A promising nanocomposite material composed of MnFe2O4 (MFO) nanoparticles of ~17 nm diameter deposited onto graphene oxide (GO) nanosheets was successfully synthesized using a modified co-precipitation method. X-ray diffraction, transmission electron microscopy, and selected area electron diffraction confirrmed the quality of the synthesized samples. Fourier transform infrared measurements and analysis evidenced that the MFO nanoparticles were attached to the GO surface. Magnetic measurements and analysis using the modified Langevin model evidenced the superparamagnetic characteristic of both the bare MFO nanoparticles and the MFO-GO nanocomposite at room temperature, and an appreciable increase of the effective anisotropy for the MFO-GO sample. Magnetic hyperthermia experiments performed by both calorimetric and ac magnetometry methods indicated that relative to the bare MFO nanoparticles, the heating efficiency of the MFO-GO nanocomposite was similar at low ac fields (0-300 Oe) but became progressively larger with increasing ac fields (>300 Oe). This has been related to the higher effective anisotropy of the MFO-GO nanocomposite. In comparison with the bare MFO nanoparticles, a smaller reduction in the heating efficiency was observed in the MFO-GO composites when embedded in agar or when their concentration was increased, indicating that the GO helped minimize the physical rotation and aggregation of the MFO nanoparticles. These findings can be of practical importance in exploiting this type of nanocomposite for advanced hyperthermia. Magnetoimpedance-based biodetection studies also indicated that the MFO-GO nanocomposite could be used as a promising magnetic biomarker in biosensing applications.

 Fuente: Nanotechnology, 2016, 27(15), 155707

Editorial: IOP Publishing

 Fecha de publicación: 01/03/2016

Nº de páginas: 11

Tipo de publicación: Artículo de Revista

 DOI: 10.1088/0957-4484/27/15/155707

ISSN: 0957-4484,1361-6528

Url de la publicación: https://doi.org/10.1088/0957-4484/27/15/155707

Autores/as

LE, ANH TUAN

GIANG, CHU DUY

TAM, LE THI

TUAN, TA QUOC

PHAN, VU NGOC

ALONSO, JAVIER

DEVKOTA, JAGANNATH

GARAIO, ENEKO

GARCÍA, JOSÉ ÁNGEL

FERNÁNDEZ GUBIEDA, MARÍA LUISA

SRIKANTH, HARIHARAN

PHAN, MANH HUONG