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Journal of Sensors and Sensor Systems An open-access peer-reviewed journal
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Volume 3, issue 2
J. Sens. Sens. Syst., 3, 241–244, 2014
https://doi.org/10.5194/jsss-3-241-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Advanced functional materials for environmental monitoring...

J. Sens. Sens. Syst., 3, 241–244, 2014
https://doi.org/10.5194/jsss-3-241-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular research article 09 Oct 2014

Regular research article | 09 Oct 2014

A simple method to recover the graphene-based chemi-resistor signal

F. Fedi1,4, F. Ricciardella2,3, M. L. Miglietta2, T. Polichetti2, E. Massera2, and G. Di Francia2 F. Fedi et al.
  • 1CNR-Institute for Composite and Biomedical Materials, Portici (Naples), Italy
  • 2ENEA UTTP-MDB Laboratory, R. C. Portici (Naples), Italy
  • 3University of Naples "Federico II", Department of Physics, Naples, Italy
  • 4Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090 Vienna, Austria

Abstract. We present the development of a simple and fast method for restoring exhaust graphene-based chemi-resistors used for NO2 detection. Repeatedly exposing the devices to gases or to air for more than 2 days, an overall worsening of the sensing signal is observed; we hypothesized that the poisoning effect in both cases is caused by the exposure to NO2. Starting from this hypothesis and from the observation that NO2 is soluble in water, we performed a recovery method consisting in the dipping of exhaust devices into ultrapure water at 100 °C for 60 s. The device performances are compared with those obtained after the restoration is achieved using the typical annealing under vacuum method.

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We present the development of a simple and fast method for restoring exhaust graphene-based chemi-resistors used for NO2 detection. Exposing the devices repeatedly to gases or to air for more than two days, an overall worsening of the sensing signal is observed. Starting from this hypothesis and from the observation that nitrogen dioxide is soluble in water, we performed a recovery method consisting in the dipping of exhaust devices into ultrapure water at 100°C for 60 sec.
We present the development of a simple and fast method for restoring exhaust graphene-based...
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