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      Preparation of transparent nanostructured N-doped TiO 2 thin films by combination of sonochemical and CVD methods with visible light photocatalytic activity

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          Abstract

          Pollution of water resources with pesticide compounds has raised serious environmental problems, and for photocatalytic degradation of these pollutants, thin film photocatalysts are preferred to colloidal ones due to the separation problem of colloidal nanoparticles. In this work, nanostructured TiO 2 and N-doped TiO 2 thin films with high transparency were deposited on glass and quartz substrates through sonochemical–chemical vapor deposition (CVD) method. The films prepared on glass and quartz substrates had nanocubic and nanospherical morphology, respectively. The presence of N atoms in the structure of TiO 2 resulted in a decrease in the band gap energy of TiO 2 and also in the reduction of photogenerated electron–hole recombination rate. Furthermore, the presence of N atoms induced the formation of Ti 3+ species which can act as hole trapping centers. The prepared thin films were also used for the visible light photocatalytic degradation of paraoxon pesticide. According to these results among the prepared thin films, the N-doped TiO 2 thin films have higher photocatalytic activity than pure TiO 2 thin films. Moreover, in comparison with the thin films deposited on quartz substrate, the films on glass substrate have higher photocatalytic performance, which can be related to the special nanocubic morphology of these samples.

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          Journal
          Journal of Advanced Ceramics
          Journal of Advanced Ceramics
          Tsinghua University Press (Tsinghua University, Beijing 100084, China )
          2226-4108
          05 September 2018
          : 07
          : 03
          : 185-196 (pp. )
          Affiliations
          aDepartment of Electrical & Electronics Engineering, Standard Research Institute (SRI), Karaj, Iran
          bDepartment of Chemical Engineering, University of Bonab, Bonab, Iran
          cMedical Laser Research Group, Medical Laser Research Center, ACECR, Tehran, Iran
          Author notes
          Article
          2226-4108-07-03-185
          10.1007/s40145-018-0270-8

          This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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