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Graphene oxide/Cu junction as relative humidity sensor

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Abstract

The paper investigates the electrical properties of the junction between the graphene oxide (GO) and some metals (Cu and Au). A simple humidity sensor, based on the adsorption of water molecules on the GO/surface in a GO/Cu junction, is described. The GO was drop-casted as a thin film, 10 μm in thickness, on the metallic substrate. The junction open-circuit voltage and short-circuit current behaviours versus the humidity level can be explained on the base of the charge carrier drift. The room temperature response of the GO/Cu water vapour detector, in terms of relative humidity in air, is compared against a well-known commercial hygrometer. The proposed device does not require external polarization, and it is inexpensive and easy to use.

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Acknowledgements

The authors thank the INFN-CIMA project in which the research was developed.

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Authors and Affiliations

  1. Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze Della Terra (MIFT), Università Di Messina, V.le F.S. d’Alcontres 31, 98166 S. Agata, Messina, Italy

    L. Torrisi & L. Silipigni

  2. CNR-IPCF, V.le F.S. d’Alcontres 37, 98166 S. Agata, Messina, Italy

    G. Salvato

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  1. L. Torrisi
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  2. L. Silipigni
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  3. G. Salvato
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Correspondence to L. Torrisi.

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Torrisi, L., Silipigni, L. & Salvato, G. Graphene oxide/Cu junction as relative humidity sensor. J Mater Sci: Mater Electron 31, 11001–11009 (2020). https://doi.org/10.1007/s10854-020-03648-5

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  • DOI: https://doi.org/10.1007/s10854-020-03648-5

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