Current Applied Physics

Korean Physical Society (한국물리학회)
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Effect of Nb doping on morphology, crystal structure, optical band gap energy of $TiO_2$ thin films

  • Lee, Deuk Yong (Department of Biomedical Engineering, Daelim University) ;
  • Park, Ju-Hyun (Department of Materials Engineering, Daelim University) ;
  • Kim, Young-Hun (Department of Materials Engineering, Korea Aerospace University) ;
  • Lee, Myung-Hyun (Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Cho, Nam-Ihn (Department of Electronic Engineering, Sun Moon University)
  • Received : 2013.08.21
  • Accepted : 2013.12.26
  • Published : 2014.03.31
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Abstract

$Nb-TiO_2$ 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 $Nb-TiO_2$. XRD results indicated that $Nb-TiO_2$ 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 $Nb-TiO_2$ 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 $Nb-TiO_2$, and the photocatalytic degradation of methylene blue.

Keywords

References

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