Synthesis And Hydrogen Peroxide Electrochemical Biosensor Application Of Graphene/Graphene-like-based Hybrids

This article contains four sections.In the first part,the molybdenum disulfide nanoflowers and molybdenum disulfide-platinum nanoparticles hybrids with special structure were prepared by one-step method.In addition,the reaction conditions such as the reaction temperature,the reaction time and the concentration of the reducing agent in the reaction were regulated.And then the composites with good structure and good dispersibility of platinum nanoparticles were prepared.Finally,the morphology and structure of the products were characterized.In the second section,it was found that the modified electrode of molybdenum disulfide-platinum nanoparticle composite had good electrical sensing performance to hydrogen peroxide by electrochemical detection of the modified glassy carbon electrode.The biosensor showed a wide linear range,low detection limit,high selectivity and long term stability.In the third part,porous three-dimensional graphene-molybdenum disulfide quantum dots composites with special structure were prepared by the combination of mechanical exfoliation method,solvent method,Hummer's modification method and freeze-drying method.In addition,in order to explore the effect of reaction time on the special structure of the composites,we carried out four groups of comparative tests with reaction times of 1 h,1.5 h,2 h and 2.5 h,respectively.It was found that the reaction time played a key role in the structure of the composites.We further characterized the prepared composites with various test techniques.In the final section,we prepared the porous three-dimensional graphene-molybdenum disulfide quantum dot composites for the preparation of hydrogen peroxide electrochemical biosensors.The results showed that the H2O2 biosensor had a wide linear range(0.01 to 5.75 mM,R = 0.9934),a low detection limit(1.83 ?M,S/N = 3),good selectivity and long-term stability.