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Effect of Additives Ag and Rare‐Earth Elements Y and Sc on the Properties of Hydrogen Sensors Based on Thin SnO2 Films during Long‐Term Testing

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Laboratory of Semiconductor Devices, Kuznetsov Siberian Physical Technical Institute, Tomsk State University, 634050 Tomsk, Russia
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Laboratory of Functional Electronics, Tomsk State University, 634050 Tomsk, Russia
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Laboratory of Nanomaterials and Heterostructures, Omsk Scientific Center of Siberian Branch, Russian Academy of Sciences, 644024 Omsk, Russia
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Department of Solid State Electronics, St. Petersburg State University, 198504 Saint Petersburg, Russia
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(7), 423; https://doi.org/10.3390/coatings9070423
Received: 29 May 2019 / Revised: 24 June 2019 / Accepted: 1 July 2019 / Published: 2 July 2019
(This article belongs to the Special Issue Thin Film Gas Sensors)
The paper presents the results of an investigation of the nanostructure, elements, and phase composition of thin (100–140 nm) tin dioxide films obtained via magnetron sputtering and containing Ag, Y, Sc, Ag + Y, and Ag + Sc additives in the volume. Electrical and gas‐sensitive characteristics of hydrogen sensors based on these films with dispersed Pt/Pd layers deposited on the surface were studied. The additives had a significant effect on the nanostructure of the films, the density of oxygen adsorption sites on the surface of tin dioxide, the band bending at the grain boundaries of tin dioxide, the resistance values in pure air, and the responses to hydrogen in the concentration range of 50–2000 ppm. During the long‐term tests of most of the samples studied, there was an increase in the resistance of the sensors in clean air and in the response to hydrogen. It has been established that the joint introduction of Ag + Y into the volume of films prevents the increase in the resistance and response. For these sensors based on thin films of Pt/Pd/SnO2:Sb, Ag, Y the responses to 100 and 1000 ppm of H2 are 25 and 575, correspondingly, the response time at exposure to 100 and 1000 ppm of H2 are 10 and 90 s, the recovery time at exposure to 100 and 1000 ppm of H2 17 and 125 s. Possible mechanisms of the effect of additives on the properties of sensors and the stability of their parameters during long‐term operation were considered. View Full-Text
Keywords: hydrogen sensor; thin film; tin dioxide; silver; rare‐earth elements; stability hydrogen sensor; thin film; tin dioxide; silver; rare‐earth elements; stability
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MDPI and ACS Style

Maksimova, N.K.; Almaev, A.V.; Sevastyanov, E.Y.; Potekaev, A.I.; Chernikov, E.V.; Sergeychenko, N.V.; Korusenko, P.M.; Nesov, S.N. Effect of Additives Ag and Rare‐Earth Elements Y and Sc on the Properties of Hydrogen Sensors Based on Thin SnO2 Films during Long‐Term Testing. Coatings 2019, 9, 423. https://doi.org/10.3390/coatings9070423

AMA Style

Maksimova NK, Almaev AV, Sevastyanov EY, Potekaev AI, Chernikov EV, Sergeychenko NV, Korusenko PM, Nesov SN. Effect of Additives Ag and Rare‐Earth Elements Y and Sc on the Properties of Hydrogen Sensors Based on Thin SnO2 Films during Long‐Term Testing. Coatings. 2019; 9(7):423. https://doi.org/10.3390/coatings9070423

Chicago/Turabian Style

Maksimova, Nadezhda K., Aleksei V. Almaev, Evgeniy Yu. Sevastyanov, Aleksandr I. Potekaev, Evgeniy V. Chernikov, Nadezhda V. Sergeychenko, Petr M. Korusenko, and Sergey N. Nesov. 2019. "Effect of Additives Ag and Rare‐Earth Elements Y and Sc on the Properties of Hydrogen Sensors Based on Thin SnO2 Films during Long‐Term Testing" Coatings 9, no. 7: 423. https://doi.org/10.3390/coatings9070423

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