HUMIDITY SENSOR AND GAS ANALYTICAL MULTISENSOR CHIP BASED ON THE MAXENE STRUCTURE OF TWO-DIMENSIONAL TITANIUM-VANADIUM CARBIDE Russian patent published in 2023 - IPC G01N27/12 B82Y40/00 

FIELD: gas analysis.

SUBSTANCE: devices for detecting gas mixtures and methods for their manufacture. A method for manufacturing a gas sensor of a chemoresistive type is proposed, which includes preparing a suspension of a two-dimensional material based on titanium carbide, applying it to a dielectric substrate in the form of a layer so that the particles of the coating material form percolation paths between the electrodes, and boiling the coated substrate into a housing, containing the number of electrical leads not less than the number of measuring electrodes that are on the dielectric substrate or on the already formed coating, characterized in that as a two-dimensional material based on titanium carbide, maxene Ti_0.2V_1.8C composition is synthesized as follows: powders of titanium, vanadium, aluminum and graphite are mixed in a molar ratio of 0.2:1.8:1.2:0.8, potassium bromide powder is added to the mixture in a mass ratio of 1:1; the resulting mixture of powders is subjected to homogenization; then the mixture is dried at a temperature of 70°C until the mass loss stops and pressed into a billet, which is covered with potassium bromide powder and heat treated in a muffle furnace at a temperature of 1100°C to the formation of a triple precursor Ti_0.2V_1.8AlC after cooling, the resulting product is washed with hot distilled water, dried at a temperature of 120°C until the weight loss stops and treated with a mixture of concentrated hydrofluoric and hydrochloric acids at a temperature of 50°C, taken in a volume ratio of 3:2, until the formation of multilayer structures of titanium-vanadium carbide Ti_0.2V_1.8C which are then washed from by-products with distilled water and filled with a 12% aqueous solution of tetramethylammonium hydroxide N(CH₃)₄(OH) so that the concentration of Ti_0.2V_1.8C is 20 g/l in it, after which the reaction medium is subjected to ultrasonic treatment for 20 min, the precipitate is isolated and washed with distilled water, and then with absolute ethanol; to the resulting delaminated maxene Ti_0.2V_1.8C alcohol is added so that the concentration of maxene Ti_0.2V_1.8C is 10 g/l, the resulting mixture is homogenized in an ultrasonic bath for 15 minutes until a suspension is formed, a suspension of delaminated maxene Ti_0.2V_1.8C is applied to a dielectric substrate by microplotter printing; before the stage of boiling, the resulting coating is dried at a temperature of 70°C in vacuum until the mass loss stops.

EFFECT: creation of gas sensors of a chemoresistive type, sensitive to humidity, functioning at room temperature, based on two-dimensional titanium and vanadium carbide.

5 cl, 7 dwg, 2 ex