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Disclosing the Sensitivity and Selectivity of Metal Oxide/Graphene Oxide-based Chemoresistors Towards VOCs
* 1, 2 , 3 , 1, 2 , 1, 2 , 1, 2
1  Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milan, Italy
2  Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali (INSTM), Via Giusti 9, 50121 Firenze, Italy
3  Nanotechnology Research Laboratory, Faculty of Engineering, University of Sydney, Sydney, NSW 2006, Australia

Published: 19 May 2021 by MDPI in 8th International Symposium on Sensor Science session Chemical Sensors
https://doi.org/10.3390/I3S2021Dresden-10163 (registering DOI)
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 highly selective towards polar compounds, such as acetone.

Keywords: gas sensors; metal oxide; graphene oxide; volatile organic compounds; sensitivity; selectivity; temperature; light
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