MoS 2 /TiO 2 heterostructure thin films were fabricated by sol-gel and chemical bath deposition methods. Crystal structure, surface morphology, chemical states of all elements, and optical property of the obtained thin films were characterized by using X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and UV-Vis spectroscopy techniques, respectively. Photocatalytic activity of all thin films was evaluated by measuring decomposition rate of methylene blue solution under visible light irradiation. The results indicate that ultrathin MoS 2 film on TiO 2 -glass substrate improves photocatalytic activity of TiO 2 in the visible light due to the efficient absorption of visible photon of MoS 2 few layers and the transfer of electrons from MoS 2 to TiO 2 . All MoS 2 /TiO 2 heterostructure thin films exhibit higher visible light photocatalytic activity than that of pure MoS 2 and TiO 2 counterparts. The best MoS 2 /TiO 2 heterostructure thin film at MoS 2 layer deposition time of 45 minutes can decompose about 60% MB solution after 150 minutes under visible light irradiation. The mechanism of the enhancement for visible-photocatalytic activity of MoS 2 /TiO 2 heterostructure thin film was also discussed.

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