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Sensors 2011, 11(9), 8611-8625; doi:10.3390/s110908611

Conductometric Sensors for Monitoring Degradation of Automotive Engine Oil

Department of Analytical Chemistry, University of Vienna, Waehringer Strasse 38, A-1090 Vienna, Austria
Dedicated to Professor Dr. Adolf Neckel on the occasion of his 85th birthday.
* Author to whom correspondence should be addressed.
Received: 16 July 2011 / Revised: 31 August 2011 / Accepted: 1 September 2011 / Published: 5 September 2011
(This article belongs to the Section Chemical Sensors)
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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.
Keywords: conductometric sensors; engine oil; imprinted polymers; carbon nanotubes; polyurethane conductometric sensors; engine oil; imprinted polymers; carbon nanotubes; polyurethane
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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

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