▎ 摘　　要

A new type of graphene-Co3O4 functionalized porphyrin was synthesized and used for selective and sensitive detection of methyl parathion (MP). Co3O4 nanoparticles were firstly modified onto graphene oxide sheets and the porphyrin/Co3O4/graphene nanocomposites were then synthesized by self-assembly decoration of anion porphyrin on Co3O4-modified graphene sheets by pi-pi stacking. By dexterously controlling the electrochemical reduction variables and optimizing the electrode preparation parameters, with the satisfactory conductivity, strong adsorption toward MP, the developed novel sensor fabricated with the as-synthesized nano-assembly for determination of MP shows some satisfactory properties such as a wide linear concentration range (from 4.0 x 10(-7) M to 2.0 x 10(-5) M), low detection limit (1.1 x 10(-8) M), favorable repeatability, long-time storage stability, and satisfactory anti-interference ability. It also had high precision for the real sample analysis, which indicated the good perspective for field application.