Characterization of ZnO/TiO2 Nanocomposites Prepared via the Sol-Gel Method

초록

ZnO/TiO2 nanocomposites were synthesized via a modified sol-gel technique by incorporating 30 and 70 wt% TiO2 nanopowder into a ZnO sol-gel matrix. Zinc acetate dihydrate was used as the ZnO precursor and de-ionized water as the solvent, while titanium oxysulfate was employed for the synthesis of TiO2 nanopowder. The synthesized ZnO/TiO2 nanocomposites were characterized by x-ray diffraction, UV-vis spectroscopy, scanning electron microscopy, and transmission electron microscopy. The ZnO/TiO2 nanocomposites showed both the ZnO (wurtzite) and TiO2 (anatase) phases. The average ZnO crystallite size of the ZnO/TiO2 nanocomposites was found to be about 26.3 nm. The TEM results confirmed that spherical TiO2 particles were embedded in the ZnO matrix. TiO2 particles attached onto the rod-like ZnO particles were also observed. The ZnO/TiO2 nanocomposites exhibited optical absorption properties superior to those of pure ZnO and TiO2.

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