▎ 摘　　要

NOVELTY - A nano graphene-carbon nanotube-ionic liquid composite film is prepared by overlapping multiple graphene sheets, where the nano graphene-carbon nanotube-ionic liquid composite film thickness is 4000-6000 nm, the distance between the two adjacent graphene sheets is 20-50 nm, the adjacent graphene sheets are dispersed with carbon nanotube and ionic liquid, and the ionic liquid is 1-butyl-3-methylimidazolium tetrafluoroborate or 1-butyl-3-methylimidazolium hexafluorophosphate. USE - Nano graphene-carbon nanotube-ionic liquid composite film for use in enzyme-free hydrogen peroxide electrochemical sensor, that is utilized in detecting heavy metal ion (all claimed), and for nano electric catalytic and biological sensor field. ADVANTAGE - The nano graphene-carbon nanotube-ionic liquid composite film can be prepared with high specific surface area, high detection sensitivity and better electrochemical activity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing a nano graphene-carbon nanotube-ionic liquid composite film.