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Open AccessArticle

(Ti,Sn) Solid Solution Based Gas Sensors for New Monitoring of Hydraulic Oil Degradation

1
Istituto di Scienze e Tecnologie per l’Energia e la Mobilità Sostenibili (CNR–STEMS), 44124 Ferrara, Italy
2
LABSON, Universitat Politecnica de Catalunya, 08222 Terrassa, Spain
3
Istituto di Scienze Applicate e Sistemi Intelligenti “E. Caianiello” (CNR-ISASI), Complesso Universitario di Monte S. Angelo, 80126 Napoli, Italy
4
Dipartimento di Chimica, Università di Torino, 10125 Torino, Italy
*
Authors to whom correspondence should be addressed.
Academic Editors: Stefano Lettieri and Michele Pavone
Materials 2021, 14(3), 605; https://doi.org/10.3390/ma14030605
Received: 30 December 2020 / Revised: 21 January 2021 / Accepted: 25 January 2021 / Published: 28 January 2021
(This article belongs to the Special Issue TiO2-Based Nanostructures, Composites and Hybrid Photocatalysts)
The proper operation of a fluid power system in terms of efficiency and reliability is directly related to the fluid state; therefore, the monitoring of fluid ageing in real time is fundamental to prevent machine failures. For this aim, an innovative methodology based on fluid vapor analysis through metal oxide (shortened: MOX) gas sensors has been developed. Two apparatuses were designed and realized: (i) a dedicated test bench to fast-age the fluid under controlled conditions; (ii) a laboratory MOX sensor system to test the headspace of the aged fluid samples. To prepare the set of MOX gas sensors suitable to detect the analytes’ concentrations in the fluid headspace, different functional materials were synthesized in the form of nanopowders, characterizing them by electron microscopy and X-ray diffraction. The powders were deposited through screen-printing technology, realizing thick-film gas sensors on which dynamical responses in the presence of the fluid headspace were obtained. It resulted that gas sensors based on solid solution TixSn1–xO2 with x = 0.9 and 0.5 offered the best responses toward the fluid headspace with lower response and recovery times. Furthermore, a decrease in the responses (for all sensors) with fluid ageing was observed. View Full-Text
Keywords: (Ti,Sn) solid solution; thick film gas sensors; hydraulic fluid ageing; mineral oil headspace analysis (Ti,Sn) solid solution; thick film gas sensors; hydraulic fluid ageing; mineral oil headspace analysis
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MDPI and ACS Style

Fioravanti, A.; Marani, P.; Massarotti, G.P.; Lettieri, S.; Morandi, S.; Carotta, M.C. (Ti,Sn) Solid Solution Based Gas Sensors for New Monitoring of Hydraulic Oil Degradation. Materials 2021, 14, 605. https://doi.org/10.3390/ma14030605

AMA Style

Fioravanti A, Marani P, Massarotti GP, Lettieri S, Morandi S, Carotta MC. (Ti,Sn) Solid Solution Based Gas Sensors for New Monitoring of Hydraulic Oil Degradation. Materials. 2021; 14(3):605. https://doi.org/10.3390/ma14030605

Chicago/Turabian Style

Fioravanti, Ambra; Marani, Pietro; Massarotti, Giorgio P.; Lettieri, Stefano; Morandi, Sara; Carotta, Maria C. 2021. "(Ti,Sn) Solid Solution Based Gas Sensors for New Monitoring of Hydraulic Oil Degradation" Materials 14, no. 3: 605. https://doi.org/10.3390/ma14030605

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