▎ 摘　　要

NOVELTY - Reduced graphene oxide/ alpha -ferric oxide-based heterostructure complex acetone sensor, comprises an alumina ceramic tube whose outer surface is set with two separate annular gold electrodes, where the gold ring electrode and alumina ceramic tube outer surface is uniformly coated with a sensitive material film, and the alumina ceramic tube inner surface is set with nickel-cadmium alloy coil. The sensitive material is reduced graphene oxide/ alpha -ferric oxide heterostructure complex. USE - The sensor is useful for detecting acetone in micro-environment. ADVANTAGE - The method is simple and suitable for mass production. DETAILED DESCRIPTION - Reduced graphene oxide/ alpha -ferric oxide-based heterostructure complex acetone sensor, comprises an alumina ceramic tube whose outer surface is set with two separate annular gold electrodes, where the gold ring electrode and alumina ceramic tube outer surface is uniformly coated with a sensitive material film, and the alumina ceramic tube inner surface is set with nickel-cadmium alloy coil. The sensitive material is reduced graphene oxide/ alpha -ferric oxide heterostructure complex. The preparation of reduced graphene oxide/ alpha -ferric oxide heterostructure complex powder comprises: (a) adding 15-20 ml deionized water into 12 mg lyophilized graphene oxide powder, ultrasonicating for 45-60 minutes to obtain a homogeneous transparent solution, dissolving 4.054 g ferric chloride hexahydrate and 1-1.5 g hexamethylenetetramine in 15-20 ml ethanol by stirring constantly, then mixing the two solutions, stirring for 15-20 minutes to obtain homogeneous solution; and (b) placing the mixed solution under hot water at 160-180 degrees C for 12-15 hours to reduce graphene oxide to reduced graphene oxide and alpha -ferric oxide crystal complex, then cooling to room temperature, centrifuging at high-speed to obtain a precipitate, sequentially washing the precipitate with deionized water and ethanol for many times, drying under vacuum at 80-90 degrees C for 16-24 hours, calcining under vacuum at 200-250 degrees C for 2-3 hours, carrying out thermal gravimetric analysis and testing to obtain 1-1.5% complex powder. An INDEPENDENT CLAIM is also included for preparing reduced graphene oxide/ alpha -ferric oxide-based heterostructure complex acetone sensor, comprising: (i) mixing the reduced graphene oxide/ alpha -ferric oxide heterostructure complex powder and deionized water in a mass ratio of 2-5:1, then grinding to obtain paste slurry, uniformly coating the slurry on outer surface of the two annular gold electrode alumina ceramic tube surface to obtain 10-30 mu m thickness sensitive material film, where the sensitive material completely covers the annular gold electrode; and (ii) baking under infrared lamp for 30-45 minutes to dry the sensitive material, then calcining the alumina ceramic tube at 150-200 degrees C for 2-3 hours, where the resistance value is 30-40 Omega through the alumina ceramic tube internal heating wire, passing the device to hot gas sensor, then welding and packaging.