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Sensors & Transducers



Vol. 246, Issue 7, November 2020, pp. 71-78
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Graphene-Tin Oxide Composite Nanofibers for Low Temperature Detection of NO 2 and O 3



1, * Sergio MASA, 2 Diego ROBÉS, 1 Esther HONTAÑÓN, 3 Jesús LOZANO,
​ 4 Siamak EQTESADI and 2 Adolfo NARROS



1 Spanish National Research Council, Dept. of Sensors and Ultrasonic Systems, C/Serrano 144, Madrid, 28006, Spain

2 Polytechnic University of Madrid, Dept. of Chemical Industrial and Environmental Engineering, C/José Gutiérrez Abascal 2, Madrid, 28006, Spain

3 University of Extremadura, Dept. of Electrical, Electronic and Automation Engineering, Av. de Elvas s/n, Badajoz, 06006, Spain

4 Abalonyx AS, Forskningsveien 1, 0373, Oslo, Norway

* E-mail: sergio.masa@csic.es



Received: 28 September 2020 /Accepted: 9 November 2020 /Published: 30 November 2020





Abstract: In this work we investigate the detection performance of nanofibers of tin oxide (SnO 2 ) towards sub-0.1 ppm nitrogen oxide (NO 2 ) and ozone (O 3 ) in air. It is found that SnO 2 nanofibers are more sensitive to O 3 than to NO 2 . and the optimal working temperature differs significantly between the two gases: 200 0 C (NO 2 ) and 350 0 C (O 3 ). SnO 2 nanofibers loaded with reduced graphene oxide (rGO) show higher sensitivity than nanofibers of pure SnO 2 at low temperatures and the optimal working temperature diminishes by around 150 0 C for the two gases. The air humidity does not modify the optimum working temperature of rGO-loaded SnO 2 nanofibers but it affects their sensitivity at temperatures below 150 0 C. Irradiation with UV light is a promising method to activate gas desorption from rGO-loaded SnO 2 nanofibers so that this material could be used in chemiresistive sensors for low temperature detection of air pollutants.


Keywords: Tin oxide nanofibers, Reduced graphene oxide, Electrospinning, UV irradiation, Air pollution.

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