A facile electrochemical sensor based on well-dispersed graphene-molybdenum disulfide modified electrode for highly sensitive detection of dopamine

A dopamine electrochemical sensor was easily fabricated by modifying the glassy carbon electrode with well-dispersed graphene and molybdenum disulfide hybrids. Graphene had the ability to enhance the electrochemical response intensity and molybdenum disulfide served as an amplification element when added to the graphene layer. The modification activity was investigated with the electrochemical impedance spectroscopy technique. A highly sensitive electrochemical method was developed to detect dopamine based on the strong enhancement effect of graphene-molybdenum disulfide. The oxidation peak currents varied linearly with the addition of dopamine over the range from 5.0 × 10− 8 to 1.0 × 10− 5 mol L− 1, and the lower detection limit was 7.13 × 10− 9 mol L− 1 (S/N = 3). This work demonstrated a simple, efficient design for a chemical sensor that employs graphene-molybdenum disulfide for dopamine detection.