▎ 摘　　要

NOVELTY - A composite material comprises a glassy carbon electrode, where a surface of the glassy carbon electrode is coated with nanometer tetroxide/titanium dioxide/nitrogen doped graphene/nano-gold composite material and adsorbed an organic ligand modified film. USE - Composite material for detecting lead ions. ADVANTAGE - The composite material can be prepared with high detection sensitivity, wide linear range, low detection limit, strong capacity and stable performance, in a cost-effective and rapid manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing a composite material.