Chemical Properties of Cerium (III) Hexacyanoferrate (II/III) on Graphene Oxide Chemically Modified with a PAMAM Dendrimer and Application as a Sensor for l ‐Dopamine Detection

Abstract A novel functional platform comprising graphene oxide (GO) and a PAMAM dendrimer (GO‐PAMAM) is presented herein, subsequently modified with Ce(III) ions and potassium hexacyanoferrate (III) to form a complex incorporating hexacyanoferrate (II/III) redox species. The resulting hybrid material was characterized by different spectroscopic techniques such as X‐ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), and cyclic voltammetry studies. Electrochemical assessments, specifically cyclic voltammetry, demonstrated the suitability of the modified electrode for the electrocatalytic detection of l ‐dopamine. A linear response was observed from 2.0 × 10⁻⁶ to 4.0 × 10⁻⁵ mol L⁻¹. The limit of detection was 4.09 × 10⁻⁷ mol L⁻¹ with a standard deviation of ±3% ( n = 3), while amperometric sensitivity was determined as 195.28 mA/mol L⁻¹.