▎ 摘　　要

NOVELTY - Preparing palladium/single-layer carboxyl graphene oxide composite film electrode, involves (a) using organic acid to activate single-layer oxidation graphene obtaining single-layer carboxyl graphene oxide under strong alkali condition, (b) dispersing the single layer carboxyl graphene oxide in the deionized water, (c) obtaining black aqueous solution, and dropping the black aqueous solution on the conductive substrate to dry to obtain the working electrode, (d) adding the palladium chloride aqueous solution into the PBS solution with pH of 7 to mix uniformly to obtain the mixed system, inserting working electrode into the mixed system, (e) combining the reference electrode and the indicating electrode, (f) performing constant potential reduction reaction in the electrochemical working station, and (g) attaching palladium/single-layer carboxyl graphene oxide composite film on conductive substrate to obtain the palladium/single-layer carboxyl graphene oxide composite film electrode. USE - Method for preparing palladium/single-layer carboxyl graphene oxide composite film electrode used in detecting hydrazine fuel (claimed). ADVANTAGE - The composite film has high electrode detection efficiency, low detection limit and good electrochemical detection performance, i.e. used for fast electrochemical detection of metadimethyl hydrazine. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a palladium/single-layer carboxyl graphene oxide composite film electrode obtained by the preparation method.