FIELD: measurement technology; gas industry.
SUBSTANCE: use to determine the presence of low concentrations of the target gases. Essence of the invention lies in the fact that the method of selectively determining the concentration of gaseous mercaptic and / or amine-containing compounds using a gas sensor based on an organic field-effect transistor is characterized by the fact that measure the amount of current in the channel of an organic field-effect transistor as a function of time; calculate the value of the threshold voltage of the opening of the organic field-effect transistor and the mobility of charge carriers as a function of time according to the value of the current in the channel of the organic field-effect transistor as a function of time; calculate the value of the relative change in the mobility of charge carriers and the offset value of the threshold voltage of the opening of the organic field-effect transistor; determine the detected mercaptic and / or amine-containing compound by the values of the relative changes in the mobility of charge carriers and the offset of the threshold voltage of the opening of the organic field-effect transistor; determine the concentration of the detected mercaptic-containing compound by the magnitude of the relative change in the mobility of the charge carriers and / or the amine-containing compound by the offset value of the threshold voltage of opening of the organic field-effect transistor.
EFFECT: providing the possibility of creating a device for selective measurement of low concentrations (from 10 ppb to 1 ppm) independently of each other, mercaptic and / or amine-containing compounds in atmospheric air or gas mixtures.
5 cl, 8 dwg
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