Highly sensitive and selective dopamine biosensor based on 3,4,9,10-perylene tetracarboxylic acid functionalized graphene sheets/multi-wall carbon nanotubes/ionic liquid composite film modified electrode

► The work developed a highly sensitive and selective biosensor for the determination of dopamine. ► A disposable electrode based on functionalized graphene sheets/MCNTs/IL was proposed. ► The method was successfully applied to the determination of Dopamine Hydrochloride Injection. ► The modified electrode shows high sensitivity, excellent reproducibility and stability.