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Humidity-sensing properties of hierarchical TiO2:ZnO composite grown on electrospun fibers

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Abstract

The performance of metal oxide-based devices for humidity impedimetric sensors depends on different conduction mechanisms during water molecules adsorption. As consequence, new strategies for development of hierarchical and doped structures of mixed metal oxides play a critical role in the production of more efficient humidity sensors. It is reported an alternative method for synthesis of hexagonal ZnO nanocrystals on TiO2-decorated electrospun fibers, allowing the production of ordered arrays of hierarchical TiO2/ZnO nanostructures. Polymeric matrix supporting fibers were removed after annealing (500 °C), providing nanostructures with promising application as low-cost humidity sensors. The structure of resulting materials was explored in addition to the influence of relative humidity (RH) (measured in the range 400 Hz–40 MHz) on complex impedance spectra.

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Acknowledgements

This research is sponsored by FEDER funds, through the program COMPETE - Programa Operacional Factores de Competitividade -, and by national funds, through FCT - Fundação para a Ciência e a Tecnologia -, under the project UID/EMS/00285/2013. The authors also acknowledge the financial support from CNPq – Projects (202451/2015-1) and (248958/2013-5).

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Authors and Affiliations

  1. Institute of Materials Science, Federal University of Sao Francisco Valley, Juazeiro, BA, 48920-310, Brazil

    Evando S. Araújo & Helinando P. de Oliveira

  2. Physics Department, Technological Institute of Aeronautics (ITA), Pç. Marechal Eduardo Gomes, 50, São José dos Campos, SP, 12228-900, Brazil

    Juliano Libardi

  3. CEMUC, Electrical and Computers Engineering Department, Faculty of Sciences and Technology, University of Coimbra, Polo 2, Pinhal de Marrocos, 3030-290, Coimbra, Portugal

    Pedro M. Faia

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  1. Evando S. Araújo
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  2. Juliano Libardi
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  4. Helinando P. de Oliveira
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Correspondence to Helinando P. de Oliveira.

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Araújo, E.S., Libardi, J., Faia, P.M. et al. Humidity-sensing properties of hierarchical TiO2:ZnO composite grown on electrospun fibers. J Mater Sci: Mater Electron 28, 16575–16583 (2017). https://doi.org/10.1007/s10854-017-7571-5

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