Direct Electrochemistry and Electrocatalysis of Myoglobin with Copper Benzenetricarboxylate Metal-Organic Frameworks@ Nitrogen-Doped Graphene Composite Modified Electrode

摘要

A novel nanohybrid material based on copper benzenetricarboxylate metal-organic framework (CuBTC) and nitrogen-doped graphene (NG) was used to immobilize myoglobin (Mb) with its biosensingability checked. The surface images of the modifiers on the electrode were characterized by SEM.Spectroscopic results demonstrated that Mb kept its native structure in the composite film. Directelectrochemistry of Mb on Cu-BTC@NG modified electrode was checked by cyclic voltammetry witha pair of well-defined redox peaks observed. The peak-to-peak separation of 0.082 V and the formalpeak potential of -0.187 V were calculated, corresponding to the realization of direct electrode transferof Mb. Electrochemical investigations of Mb modified electrode were studied in detail. The modifiedelectrode showed good sensitivity and wide linear range to the analysis of trichloroacetic acid andsodium nitrite. All the results demonstrated that is hybrid matrix exhibited a fast electron transferpathway for the electron transfer of Mb.