▎ 摘　　要

NOVELTY - Gas-sensitive composite material includes graphene and small organic molecules attached to the graphene, where the small organic molecules are attached to the graphene through supramolecular action. The small organic molecules have redox properties. USE - Gas-sensitive composite material used in gas-sensitive electrode of sensing device (all claimed). ADVANTAGE - The material can realize fast response to a certain concentration of oxidizing gas at room temperature, with high sensitivity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing a gas-sensitive composite material, which involves dissolving graphene oxide in a solvent to prepare a graphene oxide dispersion; mixing graphene oxide dispersion liquid with small organic molecules and a pH regulator to obtain a first mixed liquid, and the small organic molecules have redox properties, and first mixed liquid is alkaline; adding a reducing agent to the first mixed liquid to perform a reduction reaction to obtain a second mixed liquid; and performing solid-liquid separation on the second mixed liquid to prepare a gas-sensitive composite material; and (2) a gas-sensitive electrode, which includes gas-sensitive coating is provided on the gas-sensitive electrode, and the material of the gas-sensitive coating comprises the gas-sensitive composite material.