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NiO–TiO2 composite nanoparticles have been prepared by a modified ammonia‐evaporation‐induced synthetic method, sintered at 450°C and characterized by powder X‐ray diffraction, energy‐dispersive X‐ray spectroscopy, scanning electron microscopy, UV‐visible diffuse reflectance spectroscopy, photoluminescence spectroscopy, and electrochemical impedance spectroscopy. Doping shifts the optical absorption...