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

Fedi, F.; Ricciardella, F.; Miglietta, M. L.; Polichetti, T.; Massera, E.; Di Francia, G.

We present the development of a simple and fast method for restoring exhaust graphene-based chemi-resistors used for NO 2 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 NO 2. Starting from this hypothesis and from the observation that NO 2 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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Fedi, F. / Ricciardella, F. / Miglietta, M. L. / et al: A simple method to recover the graphene-based chemi-resistor signal. 2014. Copernicus Publications.

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