Synthesis of NiFe₂O₄ nanowires with NiO nanosheet as precursor via a topochemical solid state method

Abstract

Large scale NiFe₂O₄ nanowires were synthesized with NiO nanosheets as precursor by means of the topochemical solid state method. The morphologies and magnetic properties of NiFe₂O₄ annealed at different temperatures were studied. An appropriate annealing temperature was requested to transfer NiO nanosheets and Fe^– ions into NiFe₂O₄ nanowires. In the beginning stage of synthesizing process, the shape of NiO nanosheets remained unchanged at low temperatures. And then, NiO nanosheets split into nanowires from 400 °C to 600 °C. At last they transformed into nanoparticles from 700 °C to 1000 °C. Thus, the optimized annealing temperature was selected as 600 °C because the NiFe₂O₄ obtained at 600 °C(N600) exhibited a maximum aspect ratio of 50 with a diameter of 20 nm and a length of 1 μm. Furthermore, N600 also displayed the largest magnetization value of 26.86 A·m²/kg and the lowest coercivity(H _c) of 8914 A/m.

Keywords

Nanowire / NiO / NiFe₂O₄ / Solid state method / Topochemical method

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