A facile synthesis of antimony-doped tin oxide-coated TiO2 composites and their electrical properties
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Antimony-doped tin oxide (ATO) coated TiO2 (TiO2@ATO) conductive composites were synthesized by a sol–gel method using acetylacetone as the chelating agent in water based. As-synthesized samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electronic microscopy and high-resolution transmission electron microscopy, thermogravimetric analysis, ultraviolet–visible (UV–Vis) spectroscopy and Fourier transform infrared spectroscopy. The results showed that the optical band gap gradually decreases from 3.081 eV to 3.068 eV with the increase of antimony doping concentration. The optimal molar ratio of acetylacetone to metal ions was 4 while the water content was 50 mL. When the antimony doping concentration was 35 mol%, TiO2@ATO composite possessed the lowest resistivity of 4.5 Ω cm. ATO nanoparticles with an average particle size of 8.3 nm formed a shell of about 10 nm on the surface of TiO2. In addition, the corresponding formation mechanism of TiO2@ATO composite was proposed on the basis of the experimental analysis.
This work was financially supported by National Natural Science Foundation of China (21878024 and 21606023), the Innovation Team Project of Liaoning Province (LT2015001) and Scientific Public Welfare Research Foundation of Liaoning Province (20170054).
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