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

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 hyd...

Full description

Saved in:
Bibliographic Details
Published in:Coatings (Basel) 2019, Vol.9 (7), p.423
Main Authors: Maksimova, Nadezhda K, Almaev, Aleksei V, Evgeniy Yu Sevastyanov, Potekaev, Aleksandr I, Chernikov, Evgeniy V, Sergeychenko, Nadezhda V, Korusenko, Petr M, Nesov, Sergey N
Format: Article
Language:English
Subjects:
Additives
Chemical sensors
Dioxides
Gases
Grain boundaries
Hydrogen
Magnetron sputtering
Metals
Nanostructure
Nuclear energy
Nuclear power plants
Palladium
Phase composition
Platinum
Rare earth elements
Recovery time
Response time
Sensors
Silver
Spectrum analysis
Thin films
Tin dioxide
Yttrium
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings9070423