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Ultrasonic chemical sensor for detection of vapors of some volatile organic compounds

Balcerzak A., Zhavnerko G.

Molecular and Quantum Acoustics

2007

Vol. 28

7-12

The reaction of the organic monomolecular Langmuir-Blodgett layer, deposited on the sensor delay line using surface acoustic wave, on the presence of vapors of some volatile organic compounds from groups of aliphatic and aromatic hydrocarbons, in air has been investigated. The chemical composition of this layer is an equimolar mixture of 5-[[1,3-dioxo-3- [4- (1-oxooctadecyl) phenyl] propyl] amino] – 1,3 – benzenedicarboxylic acid (DA) and cetylamine (CA). Time of sensor reaction is less than 2 seconds. The reaction of the sensor on the hydrocarbon vapors in air is reversible. Decrease of the differential frequency after contact with the vapor-air mixture and decrease of this frequency in time are different for various hydrocarbons; a length of the chain is important for aliphatic hydrocarbons and a presence or not of side chains – for aromatic ones.

Langmuir-blodgett layer as chemosensitive element of ultrasonic chemical sensor

Balcerzak A., Zhavnerko G.

Molecular and Quantum Acoustics

2006

Vol. 27

17-24

The Langmuir-Blodgett layer deposited on one channel of the bi-channel sensor delay line is proposed as chemosensitive element of a ultrasonic chemical sensor. Chemical composition of this layer is an equimolar mixture of 5-[[1,3-dioxo-3- [4- (1-oxooctadecyl) phenyl] propyl] amino] - 1,3 - benzenedicarboxylic acid (DA) and cetylamine (CA). The thickness of this layer is equal to dimension of one molecule. The chemical sensitivity of this layer to some mixtures of air with vapor of volatile organic compounds has been investigated.