Abstract
α-Fe 2O 3 nanoparticles/TiO 2 nanowires hybrid structure is fabricated by two-step hydrothermal treatment. TiO 2 nanowires are prepared by heating of titanate nanowires, which are obtained by hydrothermal treatment of TiO 2 powder and further repeated HCl treatment. α-Fe 2O 3 nanoparticles are deposited on the surface of TiO 2 nanowires by hydrothermal treatment in Fe(NO 3) 3 solution. The HRTEM images confirm the junctions between α-Fe 2O 3 nanoparticles and TiO 2 nanowires. The formation of hybrid structures has significant influence on the magnetic properties of α-Fe 2O 3. The Morin transition temperature of α-Fe 2O 3 nanoparticles/TiO 2 nanowires hybrid structure is 190 K, which is determined by the sharp peak in the differential ZFC curve. Whereas there is no observable Morin transition for the corresponding isolated α-Fe 2O 3 nanoparticles with similar average particles size of ca. 20 nm.
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