▎ 摘　　要

NOVELTY - Metal-organic framework (MOFs)/graphene oxide (GO) composite gas-sensitive material is prepared by attaching spherical copper (isonicotinate ion)2 (Cu(INA)2) particles to graphene oxide surface with a sheet-like structure, and modifying by cyclic voltammetry and reducing graphene oxide to obtain MOFs/GO composite ammonia gas sensitive material. USE - Metal-organic framework/graphene oxide composite gas-sensitive material for detecting the concentration of ammonia gas (claimed). ADVANTAGE - The composite material exhibits good gas-sensitive sensing performance to the low-concentration ammonia gas. The method enables preparing material in simple, easy, less time consumable, and large-scale production manner with good detection effect of low-concentration ammonia gas. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a method for preparing the metal-organic framework/graphene oxide composite gas-sensitive material, which involves dispersing the graphene oxide in the mixed solution of ethanol/water; dissolving the copper nitrate and isonicotinic acid in the mixed solution of ethanol/water, stirring to make it completely dissolved, and adding the mixed solution of graphene oxide ethanol/water after ultrasonic dispersion, mixing uniformly and ultrasonically processing, reacting at 80 degrees C for 24 hours constant temperature condition, naturally cooling to room temperature, washing the filtered product for 3 times by ethanol and water, and activating for 12 hours under the vacuum condition to obtain MOF/GO composite material; coating a layer of MOF/GO composite material on the surface of the gas-sensitive sensing element to obtain the gas-sensitive sensor; putting the gas sensor in the buffer solution, using three-electrode system, cyclic voltammetry to reduce the GO into reduced graphene oxide, and obtaining composite gas-sensitive material for detecting ammonia gas; and (2) use of MOFs/GO composite gas-sensitive material for detecting the concentration of ammonia gas.