Nowadays, gas sensors play a vital role in a plethora of applications. However, there are still some important shortcomings, such as the scarce selectivity and sensitivity, especially at low operating temperatures. Herein, we report the successful sensing achieved by tailoring the chemoresistive materials comprised of graphene oxide (GO) sheets well-integrated in a three- dimensional network of n-type metal oxide semiconductors (MOS). Thanks to the synergistic effect between GO and MOS under UV light, we obtained a very good sensitivity (down to 100 ppb) towards different volatile organic compounds (VOCs, i.e., ethanol, acetone, ethylbenzene, toluene) even at room temperature. Moreover, the best performing sensor (SnO2/GO 32:1) resulted in being highly selective towards polar compounds, such as acetone.

Disclosing the Sensitivity and Selectivity of Metal Oxide/Graphene Oxide-Based Chemoresistors towards VOCs / E. Pargoletti, A. Tricoli, M. Longhi, G.L. Chiarello, G. Cappelletti. - In: ENGINEERING PROCEEDINGS. - ISSN 2673-4591. - 6(2021 May 19), pp. 18.1-18.4. ((Intervento presentato al 8. convegno International Symposium on Sensor Science tenutosi a online nel 2021 [10.3390/I3S2021Dresden-10163].

Disclosing the Sensitivity and Selectivity of Metal Oxide/Graphene Oxide-Based Chemoresistors towards VOCs

E. Pargoletti;M. Longhi;G. L. Chiarello;G. Cappelletti
2021-05-19

Abstract

Nowadays, gas sensors play a vital role in a plethora of applications. However, there are still some important shortcomings, such as the scarce selectivity and sensitivity, especially at low operating temperatures. Herein, we report the successful sensing achieved by tailoring the chemoresistive materials comprised of graphene oxide (GO) sheets well-integrated in a three- dimensional network of n-type metal oxide semiconductors (MOS). Thanks to the synergistic effect between GO and MOS under UV light, we obtained a very good sensitivity (down to 100 ppb) towards different volatile organic compounds (VOCs, i.e., ethanol, acetone, ethylbenzene, toluene) even at room temperature. Moreover, the best performing sensor (SnO2/GO 32:1) resulted in being highly selective towards polar compounds, such as acetone.
Settore CHIM/02 - Chimica Fisica
Settore CHIM/01 - Chimica Analitica
ENGINEERING PROCEEDINGS
http://hdl.handle.net/2434/866172
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/866170
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