▎ 摘　　要

NOVELTY - The method involves using high-temperature hydrolysis to make ferroferric oxide to have a microsphere structure. The ferroferric oxide microspheres is positively charged. The graphene oxide and ferroferric oxide microspheres are mixed, so that ferroferric oxide microspheres are wrapped by graphene oxide to form a three-dimensional core-housing structure composite material. The obtained composite material on the interdigital electrode substrate of the gas sensor is smeared. The chemical used in the positively charged treatment is polyethyleneimine. USE - Method for preparing gas-sensitive material with core-housing structure. ADVANTAGE - The composite gas-sensitive material with a core-housing structure has better sensitivity to gas, is detected under the condition of very low gas concentration, and has a good detection effect.