Fluorescence Intensity Response of Fumed Silica Films with Immobilized 7-hydroxy-4-methylcoumarin to Acetone Microconcentrations in Air

The spectral-fluorescence properties of the 7-hydroxy-4-methylcoumarin (Cou4) dye dissolved in ethanol and immobilized in the fumed silica (A-380 aerosil) sorbent in the form of films and their changes upon interaction with acetone molecules have been investigated. The dependence of the change in fluorescence intensity of such film samples on the concentrations of acetone and ethanol in the air in the 3–15 ppm range has been determined. The obtained results indicate the possibility of using the films for the sensory determination of acetone in the air selectively to simple alcohols (ethanol), particularly, for non-invasive diagnosis of diabetes by analyzing the exhaled human air.