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Electrospray printing of graphene layers for chemiresistive gas sensors

reduced graphene oxide
electrospray
deposition pattern
chemiresistive sensor
air pollutants
Sergio Masa, Mª José Mena, Esther Hontañón; Jesús Lozano, Siamak Eqtesadi, Adolfo Narros
Proceedings of the 7th International Electronic Conference on Sensors and Applications, ECSA-7, 15-30 November 2020, online; Engineering Proceedings, 2(1):66 (12pp), 2020
https://doi.org/10.3390/ecsa-7-08203

In this work we investigate the electrospray technique for the preparation of graphene layers for use in chemiresistive gas sensors. A dispersion of reduced graphene oxide (rGO) in isopropanol (0.1 mg/mL) is electrosprayed and the rGO flakes are deposited onto a polymeric substrate with printed interdigitated electrodes. The surface area of the substrate covered with rGO is mainly determined by the distance between the needle and the substrate, while the rGO deposition pattern strongly depends on the flowrate and the applied voltage. Homogeneous layers of rGO are obtained in stable cone-jet regime, and the room temperature detection behavior of the sensors towards NO2, O3 and CO is assessed. The sensors were not capable of detecting CO (up to 5 ppm), but they detected 0.2 ppm NO2 and 0.05 ppm O3. The results are encouraging regarding the use of electrospray for production of low-cost and low-power consumption gas sensors based on graphene for air quality applications.

Funding: This research was funded by Program Interreg-Sudoe of the European Union (EU) under Grant Agreement SEO2/P1/E569—Project NanoSen-AQM (www.nanosenaqm.eu).

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