Synthesis and characterisation of magnetic Fe₂O₃/Au core/shell nanoparticles for biomedical applications
by K. Ravichandran; Damodaran Nedumaran
International Journal of Nanoparticles (IJNP), Vol. 5, No. 4, 2012

Abstract: The present work details the preparation of core-shell Fe₂O₃@Au nanoparticles via iterative hydroxylamine seeding, which results in nanoparticles of controllable sizes ranging from 14.8 to 15.6 nm diameter. The properties of the synthesised nanoparticles were investigated by several techniques. XRD studies show that the nanoparticles have mixed two crystalline phases of α-Fe₂O₃ and γ-Fe₂O₃. The elemental analysis of the synthesised nanoparticles consists of Fe₂O₃ core and Au shell. VSM measurements ascertain that the synthesised nanoparticles having diameter d ≤ 16 nm show superparamagnetic behaviour at room temperature whereas with diameter d > 16 nm show hysteresis behaviour. Mossbauer studies exhibit the super-paramagnetic behaviour of sextet, doublet and Fe³⁺ charge state of the synthesised sample. Impedance studies of the sample exhibit a high resistance (≥ 10⁵ Ω), which confirms the mixed phases. Thus, the synthesised nanoparticles show controllable grain size, shape, texture and magnetic properties, which finds as a suitable candidate for many biomedical applications.

Online publication date: Wed, 20-Aug-2014

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