Abstract:

Surface functionalization of self-organized Ti02 nanotube (NT) arrays produced by electrochemical anodization is implemented by dextrin-coated iron-oxide nanoparticles leading to a composite semiconductor nanostructure. The morphological and structural properties are studied by electron and atomic force microscopy, X-ray diffraction, X-ray photoelectron, and resonance micro-Raman spectroscopies revealing successful deposition of maghemite (γ-Fe2o3) nanoparticles on the nanotube walls. The nanocomposite surface simultaneously exhibits high photocatalytic activity for the degradation of model pollutants under UV irradiation at relatively low loading levels of the γ-Fe2o3 nanoparticles and light-independent wetting properties, as the initially superhydrophilic surface is converted to a moderately hydrophilic substrate, while obtaining an additional functionality through the magnetic field response of the iron-oxide component that shows appreciable magnetization anisotropy. Electrochemical impedance investigati