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Open AccessArticle

Conductometric Sensors for Monitoring Degradation of Automotive Engine Oil

Department of Analytical Chemistry, University of Vienna, Waehringer Strasse 38, A-1090 Vienna, Austria
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Author to whom correspondence should be addressed.
Dedicated to Professor Dr. Adolf Neckel on the occasion of his 85th birthday.
Sensors 2011, 11(9), 8611-8625; https://doi.org/10.3390/s110908611
Received: 16 July 2011 / Revised: 31 August 2011 / Accepted: 1 September 2011 / Published: 5 September 2011
(This article belongs to the Section Chemical Sensors)
Conductometric sensors have been fabricated by applying imprinted polymers as receptors for monitoring engine oil quality. Titania and silica layers are synthesized via the sol-gel technique and used as recognition materials for acidic components present in used lubricating oil. Thin-film gold electrodes forming an interdigitated structure are used as transducers to measure the conductance of polymer coatings. Optimization of layer composition is carried out by varying the precursors, e.g., dimethylaminopropyltrimethoxysilane (DMAPTMS), and aminopropyl-triethoxysilane (APTES). Characterization of these sensitive materials is performed by testing against oil oxidation products, e.g., carbonic acids. The results depict that imprinted aminopropyltriethoxysilane (APTES) polymer is a promising candidate for detecting the age of used lubricating oil. In the next strategy, polyurethane-nanotubes composite as sensitive material is synthesized, producing appreciable differentiation pattern between fresh and used oils at elevated temperature with enhanced sensitivity. View Full-Text
Keywords: conductometric sensors; engine oil; imprinted polymers; carbon nanotubes; polyurethane conductometric sensors; engine oil; imprinted polymers; carbon nanotubes; polyurethane
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MDPI and ACS Style

Latif, U.; Dickert, F.L. Conductometric Sensors for Monitoring Degradation of Automotive Engine Oil. Sensors 2011, 11, 8611-8625.

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