Fabrication, Structure, and Magnetic Properties of Highly Ordered Prussian Blue Nanowire Arrays

Highly ordered Prussian blue nanowire arrays with diameters of about 50 nm and lengths up to 4μm have been fabricated for the first time by an electrodepositing technology with two-step anodizing anodic aluminum oxide films. X-ray diffraction and transmission electron microscopy measurement results show that the Prussian blue nanowires are dense, continuous, and highly crystalline with an fcc cubic structure of a = 10.14 A. The Mossbauer spectrum and infrared spectrum at room temperature indicate that the nanowires are ferric ferrocyanide:  one kind of iron is Fe3+ with high spin and the other is Fe2+ with low spin. Magnetic property measurement results indicate that the Curie temperature of Prussian blue nanowire decreases as the average numbers of magnetic interaction neighbors is reduced.