SENSITIVE ELEMENT OF THE SENSOR FOR DETERMINING CONCENTRATION OF ACIDS AND ALKALIS IN LIQUID OR GAS AND METHOD FOR ITS MANUFACTURE Russian patent published in 2024 - IPC G01N27/28 B82Y40/00 

FIELD: measurement.

SUBSTANCE: invention relates to gas and liquid analysis and analytical instrument making. Sensitive element of a gas and liquid sensor for detecting vapours of acids and alkalis, as well as acids and alkalis in aqueous solutions in the range of room temperatures, is made in the form of a plate containing interdigital contacts from a precious metal, at that, interdigital contacts are closed by means of whisker nanocrystals of silicon, decorated with spherical nanoparticles of molybdenum disulphide, and between whisker silicon nanocrystals and interdigital contacts there must be non-ohmic conductivity. Method for manufacturing the sensitive element of a gas and liquid sensor includes two stages. At step (i), an aqueous suspension of molybdenum disulphide nanostructures in the form of spherical nanoparticles with size of 10–150 nm and a concentration of spherical nanoparticles of not less than 1 mcg/ml is deposited on a vertical array of whisker silicon nanocrystals, then the created array is separated by ultrasonic treatment and transferred into the aqueous medium (ultrasound frequency is not less than 40 kHz). At step (ii), the finished aqueous suspension is dripped onto a plate with interdigital contacts with subsequent drying in normal conditions or nitrogen medium. Dimensions of the whisker nanocrystals are 50–500 nm in diameter and not less than 5 mcm in length in an amount of not less than 1,000 pieces, and the pitch of the interdigital contacts does not exceed the length of the whisker nanocrystals of silicon.

EFFECT: wider dynamic range of sensitivities of sensitive elements of sensors, ensuring operability of the sensitive element in vapour and liquid media.

14 cl, 4 dwg