A new check-patterned. CuSx-TiO2 film was designed to improve the photoreduction of CO2 to CH4. The check-patterned CuSx-TiO2 film with a 3D-network microstructure was fabricated by a facile squeeze method. The as-synthesized TiO2 and CuSx powders, as well as the patterned film, were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV-visible spectroscopy, cyclic voltammetry (CV), and photoluminescence (PL) spectroscopy, as well as photocurrent density and CO2 temperature-programmed desorption (TPD) measurements. Compared to pure CuSx and TiO2, the check-patterned CuSx-TiO2 film exhibited significantly increased adsorption of CO2 on its networked microstructure, attributed to the enlarged interfaces between the microparticles. The check-patterned CuSx-TiO2 film exhibited superior photocatalytic behavior, with 53.2 mu molg(cat)(-1)L(-1) of CH4 produced after 8 h of reaction, whereas 18.1 and 7.3 mu molg(cat)(-1) L-1 of CH4 were produced from pure TiO2 and CuSx films under the same reaction conditions, respectively. A model for enhanced photoactivity over the check-patterned CuSx TiO2 film was proposed. Results indicated that the check-patterned CuS-TiO2 material is quite promising as a photocatalyst for the reduction of CO2 to CH4. (C) 2016 Elsevier B.V. All rights reserved.