The Use of Ultra-Small FeO Magnetic Nanoparticles for Hydrothermal Synthesis of Fe-Doped Titanate Nanotubes.

A method of the hydrothermal synthesis of Fe-doped titanate nanotubes (TNT) is reported in which the ultra-small FeO nanoparticles are used as the sources of Fe ions. The magnetic nanoparticles with a diameter of about 2 nm are added during the washing stage of the hydrothermal procedure. During washing, they gradually degrade and at the same time, the titanate product is transformed into nanotubes. The obtained nanotubes were characterized by structural and magnetic measurements. It was found that, depending on the value of the external magnetic field, they may show the property of room temperature ferromagnetism, paramagnetism or they may be diamagnetic. It was also shown that the modified TNTs have greater photocatalytic activity compared to unmodified TNTs.