▎ 摘　　要

NOVELTY - Polyaniline-graphene capsule with three-dimensional hollow hybrid structure, is claimed. The graphene capsule has a hollow opening structure, and the polyaniline nanoparticles are polymerized in situ on the inner and outer surfaces of the graphene capsule and form pi - pi bond conjugate with the graphene capsule, and the particle diameter of the polyaniline nanoparticles is 18-40 nm. USE - The polyaniline-graphene capsule is useful as gas-sensitive material in a gas-sensitive sensor (claimed). ADVANTAGE - The polyaniline-graphene capsule: has hollow open capsule structure, and its curved portion has more heterocyclic structures i.e. five-membered rings and seven-membered rings, and can form pi - pi bond conjugate with polyaniline, makes polyaniline not simple adhering to the inner and outer surfaces of the graphene capsule, forms a strong chemical bond, achieves selective surface growth of polyaniline, makes the three-dimensional hollow hybrid structure more stable and facilitates carrier transport, and which is beneficial to the fast gas response and increased sensitivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparation of the polyaniline-graphene capsule with three-dimensional hollow hybrid structure comprising (1) using chemical vapor deposition method to prepare graphene capsules using nano zinc oxide particles as a template and acetylene as a carbon source; (2) dispersing the graphene capsules prepared in step (1) in deionized water and uniformly disperse them with ultrasound, placing the resulting dispersion in an ice bath at 0-5 degrees C, the concentration of the graphene capsules in the dispersion is 5-90 mg/l; (3) adding the aniline monomer to the dispersion in step (2) under an ice bath condition of 0-5 degrees C, for 30-60 minutes under magnetic stirring conditions to obtain the mixed solution A; where, the concentration of the aniline monomer in the mixed liquid A is 0.1-0.2 mol/l; (4) dropwise adding hydrochloric acid to the mixed solution after the reaction in step (3), magnetically stirring for 30-60 minutes under an ice bath at 0-5 degrees C to obtain mixed solution B, the volume concentration of hydrochloric acid in the mixed solution B is 83-166 ml/l; (5) adding ammonium persulfate to the mixed solution after the reaction in step (4), and magnetically stirring for 10-30 hours in an ice bath at 0-5 degrees C to obtain the mixed solution C, where, the concentration of ammonium persulfate in the mixed solution C is 0.01-0.02 mol/l; (6) separating the mixed solution after the reaction in step (5), and washing and drying the obtained product to obtain the polyaniline-graphene capsule with three-dimensional hollow hybrid structure.