A simple method to recover the graphene-based chemi-resistor signal
We present the development of a simple and fast method for restoring exhaust graphene-based chemi-resistors used for NO<sub>2</sub> 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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2014-10-01
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| Series: | Journal of Sensors and Sensor Systems |
| Online Access: | http://www.j-sens-sens-syst.net/3/241/2014/jsss-3-241-2014.pdf |
| Summary: | We present the development of a simple and fast method for restoring exhaust
graphene-based chemi-resistors used for NO<sub>2</sub> 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<sub>2</sub>.
Starting from this hypothesis and from the observation that NO<sub>2</sub> 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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| ISSN: | 2194-8771 2194-878X |