Zusammenfassung
In this paper, we report on the co-doping nitrogen and sulfur has been
achieved in the TiO2 nanotube array films by treatment with thiourea and
calcination under vacuum at 500 \degC for 3 h. The samples were characterized
by scanning electron microscopy, X-ray diffraction (XRD), X-ray photoelectron
spectroscopy (XPS) and ultraviolet-visible diffuse reflectance spectroscopy.
XPS spectra revealed that N might coexist in the forms of NTiO and NOTi, S was
incorporated into the lattice of TiO2 through substituting oxygen atoms in the
N + S co-doped TiO2 nanotube array films. XRD patterns indicated that improved
crystallinity was obtained for N + S co-doped TiO2 nanotube arrays as compared
to that of undoped TiO2 nanotube arrays. In photoelectrochemical measurements,
the photocurrent of N + S co-doped TiO2 nanotube array films was greatly
enhanced compared to that of undoped samples under visible light irradiation.
And the photocatalytic activities of the samples were evaluated on the removal
of methylene blue under visible light irradiation. The N + S co-doped TiO2
nanotube array films showed a better photocatalytic activity than the undoped
sample due to the N, S doping.
Keywords: Nanostructures; Oxide; Thin films; Electrochemical properties
Nutzer