Facile Synthesis of Yttrium-Doped Cadmium Sulfide Nanocrystals for the Simultaneous Electrochemical Sensing of Dopamine, Uric Acid, Xanthine, and Hypoxanthine

Yttrium-doped cadmium sulfide (Y-CdS) nanocrystals were synthesized by a co-precipitation method. The electrochemical behavior of the modified electrode, Y-CdS/glassy carbon electrode, was explored by voltammetric and electrochemical impedance studies. The electrochemical performance of the modified electrode demonstrated a remarkable enhancement in peak current for the oxidation of dopamine and was also used for the simultaneous determination of dopamine, uric acid, xanthine, and hypoxanthine, which exhibit a linear response for all these biomolecules. The modified electrode also demonstrated long-term stability, good reproducibility and successfully applied to the determination of dopamine in real samples, enabling rapid detection in practical applications.