In a recent study, the construction of immunosensors based on graphite-epoxy with RIgG incorporated into the composite matrix is presented. To improve the electrochemical properties of the immunocomposite electrodes, electrochemical impedance spectroscopy and cyclic voltammetry were used for characterization and optimization. The optimal proportion of the transducer material (graphite-epoxy ratio) was determined to be between 16% and 17% with a constant amount of RIgG. The optimal composition range provides high electron-transfer rate, high signal-to-noise ratio, and suitable sensitivity.