▎ 摘　　要

NOVELTY - A three-dimensional graphene-metal oxide composite sensing film modified electrode comprises a substrate electrode, where the substrate electrode is a metal wire electrode and the surface is modified by a hydrothermal reaction to form a composite sensing film in situ. The composite sensing film is a three-dimensional porous structure of graphene-metal oxide composite composed of a three-dimensional graphene skeleton and metal oxide nanoparticles uniformly dispersed on the surface. The composite sensing film is formed by a precursor solution containing graphene oxide and a metal salt, which is assembled in situ on the surface of the metal wire electrode by hydrothermal reaction. USE - Three-dimensional graphene-metal oxide composite sensing film modified electrode. ADVANTAGE - The composite sensing film has excellent micro surface structure in simple manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing a graphene-metal oxide composite sensing film modified electrode, which involves pre-treating a surface of the metal wire electrode, ultrasonically dispersing graphene oxide into pure water to prepare an aqueous solution of graphene oxide at a concentration of 1-10 mg/mL, weighing 10-100 mg of metal salt and dissolving ultrasonically into 10 mL of the aqueous graphene oxide solution, adding ammonia water to the aqueous solution and ultra-sonicating to prepare a precursor solution, placing the pretreated metal wire electrode in a glass capillary sealed at one end and injecting the precursor solution into the capillary tube and closing the other end of the capillary tube, placing the closed capillary tube in an oven and reacting hydrothermally at 120-180 degrees C for 12-36 hours, natural cooling, taking out the metal wire electrode from the capillary tube and forming composite sensing film on the surface of the metal wire electrode to prepare the composite sensing film modified electrode after freeze-drying. A composite sensing film is formed on the surface of the metal wire electrode to prepare the composite sensing film modified electrode.