Graphene oxide for gas detection under standard humidity conditions

Year: 2015

Authors: Donarelli M., Prezioso S., Perrozzi F., Giancaterini L., Cantalini C., Treossi E., Palermo V., Santucci S., Ottaviano L.

Autors Affiliation: ‎Univ Aquila, Dept Phys & Chem Sci, I-67100 Laquila, Italy; Univ Aquila, Dept Ind & Informat Engn & Econ, I-67100 Laquila, Italy; CNR ISOF, I-40129 Bologna, Italy; MIST ER Lab, I-40129 Bologna, Italy; Univ Aquila, Dept Phys & Chem Sci, Gc LNGS INFN, I-67100 Laquila, Italy; UOS LAquila, CNR SPIN, I-67100 Laquila, Italy; Univ Brescia, CNR INO Brescia & Sensor Lab, Dept Informat Engn, I-25123 Brescia, Italy

Abstract: Graphene oxide (GO) synthesis is the easiest way to functionalize graphene, preserving the high graphene surface to volume ratio. Therefore, GO is a promising candidate for gas sensing applications. In this paper, an easy-to-fabricate and high sensitivity GO-based gas sensor is proposed. The device is fabricated by drop-casting a solution of GO flakes dispersed in water on a prepatterned Si3N4 substrate with 30 mu m spaced Pt electrodes. The sensing material has been studied using scanning electron microscopy and x-ray photoelectron spectroscopy. The large lateral dimensions of the flakes (tens of microns) allow single GO flake to bridge adjacent electrodes. The high quality of the synthesized flakes results in the gas sensor high sensitivity to and low detection limit (20 ppb) of NO2. The gas sensor response to NO2 has been studied in various relative humidity environments and it is demonstrated not to be affected by the presence of water vapor. Finally, the gas sensor responses to acetone, toluene, ethanol, and ammonia are reported.

Journal/Review: 2D MATERIALS

Volume: 2 (3)      Pages from: 035018-1  to: 035018-9

KeyWords: graphene oxide; gas sensor; NO2; relative humidity; cross-sensitivity
DOI: 10.1088/2053-1583/2/3/035018

Citations: 45
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