GAS-SENSITIVE COMPOSITE AND METHOD OF ITS PRODUCTION Russian patent published in 2019 - IPC C08J5/24 B82B3/00 B82Y15/00 B82Y30/00 B82Y40/00 B32B17/04 

FIELD: electronic equipment.

SUBSTANCE: group of inventions relates to electronics and is intended to produce gas-sensitive material used in devices which convert concentration of detected impurity gas in air into an electrical signal. Gas-sensitive composite contains a nonconducting fibrous matrix and a nanostructured conducting material. Matrix is a membrane consisting of non-conducting fibers with average diameter of 2 mcm, average pore size of which is 5 mcm. Membrane is selected from glass-fiber or polymer filtration. Nanostructured material is a polymer composite deposited on the surface of fibers with a layer with thickness of less than 50 nm, which includes single-wall carbon nanotubes and polymer binder selected from polyvinyl alcohol, polyvinyl butyral or polycarbonate. Content of carbon nanotubes is 0.05–0.2 wt. %. To produce a gas-sensitive composite through a porous fibrous membrane, a stable dispersion of carbon nanotubes containing dissolved polymer binder is filtered. Dispersion is dried.

EFFECT: simplified method of producing gas-sensitive material; wider range of detectable gases, shorter response time owing to higher rate of diffusion of gases inside the material, high sensitivity of gas sensors.

4 cl, 3 dwg, 4 ex