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Piezoelectric sensor sensitive to nitrobenzene based on a cyclohexanone-formaldehyde coating

โœ Scribed by Krzysztof Ren

Book ID
102987101
Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
585 KB
Volume
286
Category
Article
ISSN
0003-2670

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โœฆ Synopsis

This paper presents the construction and analytic properties of a piezoelectric sensor with a cyclohexanone-formaldehyde polymer coating. The sensor was constructed on the basis of a quartz resonator with a resonance frequency of 9 MHz by coating its surface with polymer layers changing the resonance frequency by 10 kHz. The sensor is highly sensitive to aromatic nitro-compounds. Its sensitivity to nitrobenzene vapour is 0.73 Hz/pg 1-l (4 Hz/ppm). An attempt was made to assess the type of intermolecular interactions which determine the sensitivity of the sensor. The sensor was used to determine nitrobenzene in air and results were compared to those obtained from measurements performed by gas chromatography.

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โœ F. Benmakroha; J.F. Alder ๐Ÿ“‚ Article ๐Ÿ“… 1995 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 470 KB

Isotherms for water, nitrobenzene and 2-nitrotoluene adsorbed onto a platinum/lead coated 15 MHz AT-cut piezoelectric crystal are reported. Both the nitrobenzene and 2-nitrotoluene isotherms were BDDT type 1 (Langmuir) in shape, as were the water isotherms, and showed predictable behaviour over temp