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High temperature stable monodisperse superparamagnetic core-shell iron-oxide@SnO2 nanoparticles

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4 Author(s)
Xu, Xiaobin ; International Center for New-Structured Materials, Zhejiang University (ICNSM) and Laboratory of New-Structured Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China ; Ge, Mingyuan ; Wang, Cen ; Jiang, J.Z.

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Monodisperse superparamagnetic SnO2-coated iron-oxide nanoparticles (∼16.4 nm) have been synthesized via thermal decomposition. The thickness of SnO2 shells can be controlled from 1–5 nm. As-prepared SnO2-coated iron-oxide nanoparticles with high saturation magnetization (18 Am2/kg), are stable up to 600 °C, which can be formed stable ferrofluid. It was suggested that the SnO2 shell acts as a barrier of preventing the growth of γ-Fe2O3 and consequently, avoiding the γ-Fe2O3-to-α-Fe2O3 phase transition at high temperatures.

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Applied Physics Letters  (Volume:95 ,  Issue: 18 )