▎ 摘　　要

NOVELTY - A zinc oxide nanotube/graphene composite film modified electrode preparing method involves dissolving polymer and zinc compounds in an organic solvent to form a mixed solution. The mixed solution is heated to obtain spinning precursor solution, which is subjected to electrostatic spinning to obtain polymer/salt compound composite nano-fiber precursor, which is oxidized to obtain zinc oxide nanotubes. The zinc oxide nanotubes are dissolved with graphene in solvent mixture by adding Nafion (RTM: Sulfonated tetrafluoroethylene based fluoropolymer-copolymer) and modified on an electrode. USE - Method for preparing zinc oxide nanotube/graphene composite film modified electrode that is utilized as sensing electrode in the determination of trace amounts of heavy metal lead ion concentration in water body (claimed). ADVANTAGE - The method enables preparing the electrode with good stability, large specific surface area, increased electrical conductivity, and sensitive response. DETAILED DESCRIPTION - A zinc oxide nanotube/graphene composite film modified electrode preparing method involves dissolving polymer and zinc compounds in an organic solvent to form a mixed solution. The mixed solution is heated to obtain spinning precursor solution, which is subjected to electrostatic spinning to obtain polymer/salt compound composite nano-fiber precursor. The composite nano-fiber precursor is oxidized in an air atmosphere to obtain zinc oxide nanotubes. The zinc oxide nanotubes are dissolved with graphene in solvent mixture by adding Nafion (RTM: Sulfonated tetrafluoroethylene based fluoropolymer-copolymer) to obtain suspension, The suspension is modified on an electrode to obtain zinc oxide nanotube/graphene composite film modified electrode according to ratio of 3:1-1:5.