▎ 摘　　要

NOVELTY - Graphite as electrode is connected with positive and negative power supplies and inserted in electrolyte, and direct current is applied and preliminary electrolysis is carried out, to obtain graphite sheet. The electrolyte is placed in oxygen-free environment, microwave treated and ultrasonically stripped. The electrolyte is centrifuged, and graphene is separated, washed and vacuum dried. Mesoporous indium oxide nanoparticles and graphene are added to deionized water, filtered and dried, to obtain graphene-indium oxide mesoporous nanocomposite material. USE - Preparation of graphene-indium oxide mesoporous nanocomposite material used for gas sensor. ADVANTAGE - The method enables preparation of graphene-indium oxide mesoporous nanocomposite material with low energy consumption by environmentally-friendly, economical and simple method. The graphene-indium oxide mesoporous nanocomposite material has excellent gas sensitivity. DETAILED DESCRIPTION - Two pieces of graphite as electrode are connected with positive and negative power supplies. The electrode is inserted in electrolyte, and direct current is applied and preliminary electrolysis is carried out. Pulse voltage is applied to electrolyte solution and electrolyzed, to obtain graphite sheet. The electrolyte is placed in oxygen-free environment, microwave treated, ultrasonically stripped, and the graphene sheet is separated to obtain graphene. The electrolyte is centrifuged, and graphene is separated, washed with ethanol and vacuum dried. Mesoporous indium oxide nanoparticles and graphene are added to deionized water, ultrasonically processed, uniformly distributed, filtered and dried in vacuum environment, to obtain graphene-indium oxide mesoporous nanocomposite material.