High-ordered Langmuir-Blodgett films as a sensitive coatings for acoustic sensors
Ilya A. Gorbachev1, Andrey V. Smirnov1, Vladimir V. Kolesov1, Iren E. Kuznetsova1, 1Institute of Radioengineering and Electronics RAS, Moscow, Russia
Abstract
The work is devoted to studying sensor properties of Langmuir-Blodgett films of different compositions. A possibility of their application as a sensor coatings of different type acoustic wave sensors based was shown. The acoustic SAW sensor based on LB biofilm of phospholipid molecules with immobilized enzyme molecules of alcohol oxidase was created. As a result of the gas sensing properties of the formed coatings it was shown the LB films with alcohol oxidase enzyme have a response to ethanol vapors. The dependence of the amplitude response of the sensor was linear at the ethanol concentration in the total flow in the range of 10 to 70%. An acousto-electronic sensor of glucose based on waves in the plate was created. The sensor coating of the sensor was formed from the Langmuir-Blodgett film of DPPE phospholipid molecules with immobilized enzyme of glucoseoxidase. The created sensor was able to detect the glucose in its water solution in the concentration range of 0 to 1 mg/ml. The selective acousto-electronic SAW sensor of chloroform based on the LB films of lipid molecules was created. There were used a typical surfactant molecule of arachidic and stearic acid for creation of multilayer film coating that was sensitive to vapor of chemistry. The existence of the sensor response was connected with the high chemical affinity between chloroform and fatty acid molecules. It showed the possibility of creation of gas sensor without using specific molecules like enzymes or phthalocyanines.
This research was funded by the RUSSIAN SCIENCE FOUNDATION, grant number 23-79-10079
Speaker
Ilya A. Gorbachev
Institute of Radioengineering and Electronics RAS
Russia
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