▎ 摘　　要

NOVELTY - A functional polyelectrolyte/graphene oxide multilayer film comprises polymer/inorganic hybrid multilayer film structural material, which is obtained by layer-by-layer self-assembly depositing branched polyethylenimine and functionalized modified graphene on surface of substrate. The branched polyethylenimine and functionalized modified graphene are self-assembled into multilayer film by electrostatic interaction and hydrogen bonding. The multilayer film structure comprises functional group capable of complexing with heavy metal ions. USE - Functional polyelectrolyte/graphene oxide multilayer film is useful as sensing coating for identifying and detecting trace heavy metal ions in water and preparing chemical sensor using quartz crystal microbalance technique (claimed). ADVANTAGE - The functional polyelectrolyte/graphene oxide multilayer film has high selectivity and excellent electrostatic effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of functional polyelectrolyte/graphene oxide multilayer film, which involves weighing small molecule (A), complexing group, amino group, 0.125-0.5 g/l graphene oxide, 82 mg 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride as catalyst and 49.2 mg N-hydroxysuccinimide, dispersing in 20 ml deionized water, immersing substrate in polyethylenimine aqueous solution and then washing using deionized water and drying.