Improved heating efficiency of bifunctional MnFe2O4/ZnS nanocomposite for magnetic hyperthermia application

Abstract MnFe 2 O 4 /ZnS magneto-fluorescent nanocomposite were synthesised by simple co-precipitation method and its structural, morphological, optical and magnetic characterization were done by XRD, HRTEM, FTIR and VSM techniques. The presence of MnFe 2 O 4 and ZnS in the nanocomposites was confirmed by XRD. Magnetic study shows that the nanoparticles manifest near superparamagnetic behaviour with a small coercivity of ∼66 G at room temperature and saturation magnetization significantly increases after coating ZnS on the surface of MnFe 2 O 4 core. The FTIR study confirms the incorporation of ZnS nanoparticles on the surface of MnFe 2 O 4 nanoparticles. PL spectra demonstrated the red shifted emission of nanocomposites as compared with that of pure ZnS. The heating efficiency of the nanocomposites is measured by its SAR and ILP values. This study exhibits the quantitative link between the sizes and saturation magnetization which is intimately intertwined with the heating efficiency of the nanoparticles.