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Multilayered TiO2/TiO2−x/TiO2 films deposited by reactive sputtering for photocatalytic applications

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Abstract

Multilayered TiO2/TiO2−x/TiO2 films, deposited by twenty periodical interruptions of O2 flow during reactive sputtering deposition were submitted to photocatalytic tests and characterized. The O2 flow interruptions lasted 10 s, 38 s, 45 s, and 70 s, while the regular flow periods lasted 540 s. The photocatalytic tests were performed using UV irradiation from a mercury lamp and a solution of methylene blue dye. The best photocatalytic response was observed in samples corresponding to 10 s interruptions. The results show that the amount of degraded dye was increased by an average of 1.67 times in the interrupted flow sample as compared to the homogeneous TiO2 film deposited under similar conditions. The results show that this relatively simple deposition procedure can produce significant improvements to the photocatalytic activity of the TiO2-based catalysts.

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All data generated or analyzed during this study are available in this published article or are available from the corresponding author on reasonable request.

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Acknowledgments

The authors acknowledge the Laboratório de Plasmas e Processos – LPP, of the Instituto Tecnológico de Aeronáutica – ITA, for the Raman spectroscopy measures, the Conselho Nacional de Desenvolvimento Científico e Tecnológico – CNPq, grant 307199/2018-5, and the Fundação de Amparo à Pesquisa do Estado de São Paulo – FAPESP, Grant 2017/18916-2, for the financial support.

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Authors and Affiliations

  1. School of Sciences, Graduate Program in Materials Science and Technology - POSMAT, Universidade Estadual Paulista – UNESP, Bauru, São Paulo, Brazil

    Lucas Caniati Escaliante, Lucas Jorge Affonço & Jose Humberto Dias da Silva

  2. Physics Department, Fundamental Sciences Division – IEF, Instituto Tecnológico de Aeronáutica – ITA, São José dos Campos, São Paulo, Brazil

    Andre Luis de Jesus Pereira

Authors
  1. Lucas Caniati Escaliante
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  2. Andre Luis de Jesus Pereira
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  3. Lucas Jorge Affonço
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  4. Jose Humberto Dias da Silva
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Contributions

LCE: Conceptualization, investigation, validation, formal analysis, writing—original draft. visualization. ALJP: Formal analysis, investigation, conceptualization. LJA: Investigation, conceptualization. JHDS: Formal analysis, methodology, conceptualization, supervision, resources, writing—review, funding acquisition.

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Correspondence to Lucas Caniati Escaliante.

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The authors have no relevant financial or non-financial interests to disclose.

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Escaliante, L.C., Pereira, A.L.J., Affonço, L.J. et al. Multilayered TiO2/TiO2−x/TiO2 films deposited by reactive sputtering for photocatalytic applications. Journal of Materials Research 36, 3096–3108 (2021). https://doi.org/10.1557/s43578-021-00310-6

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  • DOI: https://doi.org/10.1557/s43578-021-00310-6

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