Nanocomposites SnO2/SiO2 for CO Gas Sensors: Microstructure and Reactivity in the Interaction with the Gas Phase Full article
Journal |
Materials
ISSN: 1996-1944 |
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Output data | Year: 2019, Volume: 12, Number: 7, Article number : 1096, Pages count : 14 DOI: 10.3390/ma12071096 | ||||||
Tags | nanocomposites; tin dioxide; silicon dioxide; hydrothermal synthesis; gas sensor; carbon monoxide; humidity; active surface groups | ||||||
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Funding (1)
1 | The Ministry of Education and Science of the Russian Federation | 14.613.21.0075 (RFMEFI61317X0075) (АААА-А17-117120750029-3) |
Abstract:
Nanocomposites SnO2/SiO2 with a silicon content of [Si]/([Sn] + [Si]) = 3/86 mol.% were obtained by the hydrothermal method. The composition and microstructure of the samples were characterized by EDX, XRD, HRTEM and single-point Brunauer-Emmet-Teller (BET) methods. The surface sites were investigated using thermal analysis, FTIR and XPS. It is shown that the insertion of silicon dioxide up to the value of [Si]/([Sn] + [Si]) = 19 mol.% stabilizes the growth of SnO2 nanoparticles during high-temperature annealing, which makes it possible to obtain sensor materials operating stably at different temperature conditions. The sensor properties of SnO2 and SnO2/SiO2 nanocomposites were studied by in situ conductivity measurements in the presence of 10–200 ppm CO in dry and humid air in the temperature range of 150–400 °C. It was found that SnO2/SiO2 nanocomposites are more sensitive to CO in humid air as compared to pure SnO2, and the sample with silicon content [Si]/([Sn] + [Si]) = 13 mol.% is resistant to changes in relative air humidity (RH = 4%–65%) in the whole temperature range, which makes it a promising sensor material for detecting CO in real conditions. The results are discussed in terms of the changes in the composition of surface-active groups, which alters the reactivity of the obtained materials.
Cite:
Gulevich D.
, Rumyantseva M.
, Gerasimov E.
, Marikutsa A.
, Krivetskiy V.
, Shatalova T.
, Khmelevsky N.
, Gaskov A.
Nanocomposites SnO2/SiO2 for CO Gas Sensors: Microstructure and Reactivity in the Interaction with the Gas Phase
Materials. 2019. V.12. N7. 1096 :1-14. DOI: 10.3390/ma12071096 WOS Scopus РИНЦ
Nanocomposites SnO2/SiO2 for CO Gas Sensors: Microstructure and Reactivity in the Interaction with the Gas Phase
Materials. 2019. V.12. N7. 1096 :1-14. DOI: 10.3390/ma12071096 WOS Scopus РИНЦ
Files:
Full text from publisher
Dates:
Submitted: | Mar 15, 2019 |
Accepted: | Mar 29, 2019 |
Published online: | Apr 2, 2019 |
Published print: | Apr 10, 2019 |
Identifiers:
Web of science | WOS:000465500700095 |
Scopus | 2-s2.0-85065648774 |
Elibrary | 38732841 |
Chemical Abstracts | 2019:2394359 |
PMID | 30987046 |
OpenAlex | W2926167639 |