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Insight into optical properties of carbazole-supported on CeO2/TiO2 composite

In the paper, a series of CeO2/TiO2 composites doped with carbazole were synthesized by impregnation method. The characterizations of XRD, TG-DTG, FT-IR, UV–vis adsorption, FESEM and FL spectra were adopted to analyze the structures and optical properties of these obtained samples. XRD, TG-DTG and FESEM results showed that these samples were successfully prepared, and the grain size of these samples became larger with the increasing calcination temperature. At the same time, there was a strong interaction between CeO2 and TiO2 when the calcination temperature was around 600 °C, resulting in the formation of Ce3+ and corresponding oxygen vacancy defects on the surface. The FT-IR, FL and UV–vis results exhibited that the interaction between carbazole molecules and different carriers first decreased and then increased with the increase of calcination temperature, and corresponding fluorescence intensity and optical band gap properties of these samples showed the same change as well. The 20car/Ce/Ti-600 sample showed the lowest band gap of 2.73 eV.