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• W1965628548 endingPage "2236" @default.
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• W1965628548 abstract "Quartz crystal microbalance (QCM) gas sensors based on the alternate adsorption of TiO2 and polyacrilic acid (PAA) were developed for the sensitive detection of amine odors. Individual TiO2 gel layers could be regularly assembled with a thickness of ∼0.3 nm by the gas-phase surface sol−gel process (GSSG). The thickness of the poly(acrylic acid) (PAA) layer is dependent on its molecular weight, showing different thicknesses of ∼0.4 nm for PAA25 (Mw 250 000) and 0.6−0.8 nm for PAA400 (Mw 4 000 000). The QCM sensors showed a linear response to ammonia in the concentration range 0.3−15 ppm, depending on the deposition cycle of the alternate TiO2/PAA layer. The ammonia binding is based on the acid−base interaction to the free carboxylic acid groups of PAA and the limit of detection (LOD) of the 20-cycle TiO2/PAA400 film was estimated to be 0.1 ppm when exposed to ammonia. The sensor response was very fast and stable in a wide relative humidity (rH) range of 30−70%, showing almost the same frequency changes at a given concentration of ammonia. Sensitivity to n-butylamine and ammonia was higher than to pyridine, which is owing to the difference of molecular weight and basicity of the amine analytes. The alternate TiO2/PAA400 films have a highly effective ability to capture amine odors, and the ambient ammonia concentration of 15 ppm could be condensed up to ∼20 000 ppm inside the films." @default.
• W1965628548 created "2016-06-24" @default.
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• W1965628548 date "2010-02-19" @default.
• W1965628548 modified "2023-09-25" @default.
• W1965628548 title "Nanoassembled Thin Film Gas Sensors. III. Sensitive Detection of Amine Odors Using TiO₂/Poly(acrylic acid) Ultrathin Film Quartz Crystal Microbalance Sensors" @default.
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• W1965628548 doi "https://doi.org/10.1021/ac901813q" @default.
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