Effect of Nb doping on morphology,crystal structure,optical band gap energy of TiO2 thin films |
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| Institution: | 1. Department of Biomedical Engineering, Daelim University, Anyang 431-715, Republic of Korea;2. Department of Materials Engineering, Daelim University, Anyang 431-715, Republic of Korea;3. Department of Materials Engineering, Korea Aerospace University, Goyang 412-791, Republic of Korea;4. Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology, Seoul 153-801, Republic of Korea;5. Department of Electronic Engineering, Sun Moon University, Asan 336-708, Republic of Korea |
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| Abstract: | Nb–TiO2 nanofibers and thin films were prepared using a sol–gel derived electrospinning and spin coating, respectively, by varying the Nb/Ti molar ratios from 0 to 0.59 to investigate the effect of Nb doping on morphology, crystal structure, and optical band gap energy of Nb–TiO2. XRD results indicated that Nb–TiO2 is composed of anatase and rutile phases as a function of Nb/Ti molar ratio. As the Nb/Ti molar ratio rose, the anatase to rutile phase transformation and the reduction in crystallite size occurred. The band gap energy of Nb–TiO2 was changed from 3.25 eV to 2.87 eV when the anatase phase was transformed to rutile phase with increasing the Nb doping. Experimental results indicated that the Nb doping was mainly attributed to the morphology, the crystal structure, the optical band gap energy of Nb–TiO2, and the photocatalytic degradation of methylene blue. |
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| Keywords: | Electrospinning Spin coating Optical band gap energy Photodegradation |
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