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Reference type: Journal
Authors: Latif U, Rohrer A, Lieberzeit PA, Dickert FL
Article Title: QCM gas phase detection with ceramic materials-VOCs and oil vapors.
Publication date: 2011
Journal: Analytical and Bioanalytical Chemistry
Volume: 400
Issue: (8)
Page numbers: 2457-2462.
DOI: 10.1007/s00216-011-4684-1
Alternative URL: http://www.springerlink.com/content/p1483083020312h0/

Abstract: Titanate sol-gel layers imprinted with carbonic acids were used as sensitive layers on quartz crystal microbalance. These functionalized ceramics enable us detection of volatile organic compounds such as ethanol, n-propanol, n-butanol, n-hexane, n-heptane, n-/iso-octane, and n-decane. Variation of the precursors (i.e., tetrabutoxy titanium, tetrapropoxy titanium, tetraethoxy titanium) allows us to tune the sensitivity of the material by a factor of 7. Sensitivity as a function of precursors leads to selective inclusion of n-butanol vapors down to 1ppm. The selectivity of materials is optimized to differentiate between isomers, e.g., n- and iso-octane. The results can be rationalized by correlating the sensor effects of hydrocarbons with the Wiener index. A mass-sensitive sensor based on titanate layer was also developed for monitoring emanation of degraded engine oil. Heating the sensor by a meander avoids vapor condensation. Thus, a continuously working oil quality sensor was designed
Template and target information: ethanol, n-propanol, n-butanol, n-hexane, n-heptane, n-octane, iso-octane, n-decane
Author keywords: sensors, Titanate sol-gel layers, quartz crystal microbalance (QCM), Volatile organic compounds (VOCs)

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