A selective and sensitive sensor based on highly dispersed cobalt porphyrin-Co3O4-graphene oxide nanocomposites for the detection of methyl parathion

Abstract

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 π–π 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 × 10−7 M to 2.0 × 10−5 M), low detection limit (1.1 × 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.