Highly Sensitive and Selective Determination of Dopamine in the Presence of Ascorbic Acid Using Gold Nanoparticles‐Decorated MoS₂ Nanosheets Modified Electrode

Herein, a novel nanocomposite has been synthesized by molybdenum disulfide (MoS 2 ) nanosheets and gold nanoparticles (AuNPs) via a microwave‐assisted hydrothermal method, which possesses the specific features of both MoS 2 and AuNPs. The AuNPs@MoS 2 nanocomposite modified electrode exhibits excellent electrocatalytic activity toward dopamine (DA). Its oxidation peak current shows a linear dependence over the DA concentration in the range from 0.1 to 200 µM, with a detection limit of 80 nM ( S / N =3). More importantly, the AuNPs@MoS 2 ‐based sensor can detect DA in the presence of a large excess of ascorbic acid. The AuNPs@MoS 2 ‐based sensor shows good sensitivity, reproducibility and selectivity, suggesting that the AuNPs@MoS 2 nanocomposite is a promising candidate in electrochemical sensing and other electrocatalytic applications.