Abstract

N-doped TiO 2 nanotube arrays were prepared by electrochemical anode oxidation of Ti foil followed by treatment with N 2-plasma and subsequent annealed under Ar atmosphere. The morphologies, composition and optical properties of N-doped TiO 2 nanotube arrays were characterized using field-emission scanning electron microscope (FE-SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction spectrometer (XRD), Photoluminescence (PL) and UV–vis diffusion reflection spectroscopy (UV–vis DRS). Methylene blue (MB) solution was utilized as the degradation model to evaluate the photocatalytic activity of the samples under visible light irradiation. The results suggested N 2-plasma treatment created doping of nitrogen onto the surface of photoelectrodes successfully and the N-doped TiO 2 nanotube arrays display a significantly enhancement of the photocatalytic activity comparing with the pure TiO 2 nanotube arrays under the visible light irradiation.

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