▎ 摘　　要

NOVELTY - Reductive graphene wrapped tricobalt tetraoxide composite nano fiber comprises reductive grapahene and tricobalt tetraoxide. The amount of reductive grapheme based on the composite nano fiber is 1-10%. USE - The reductive graphene wrapped tricobalt tetraoxide composite nano fiber is useful as a gas-sensitive material in gas sensors, lithium battery electrode material, catalyst and magnetic materials (claimed). ADVANTAGE - The composite nanofiber has stable chemical properties, high ammonia gas sensing characteristics and high conductivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the reductive graphene wrapped tricobalt tetraoxide composite nano fiber, comprising (a) dispersing 0.02-1.6 pts. wt. graphene oxide in 0.06-8 pts. wt. dimethylformamide, ultrasonically processing in an ultrasonic machine to obtain graphene oxide dispersion liquid, (b) dissolving 6-60 parts cobalt nitrate hexahydrate in 15-150 parts ethanol to obtain solution A, dissolving 6-60 parts polyvinylpyrrolidone in 15-150 parts ethanol to obtain solution B, magnetically stirring solutions A and B until clear, (c) adding graphene oxide dispersion liquid of the step (a) into cobalt nitrate containing mixed solution, magnetically stirring to obtain electrospinning precursor solution, (d) adding the precursor solution into a needle head connected to 18-25 kV direct current voltage, taking out the electrospinning precursor via a syringe pump, placing an aluminum foil at the needle point to collect generated nano fiber product, and carrying out secondary sintering.