Abstract
Herein, platinum nanoparticles-decorated molybdenum disulfide (PtNPs@MoS2) nanocomposite has been synthesized via a microwave-assisted hydrothermal method, which was characterized by transmission electron microscopy (TEM) and powder X-ray diffraction (XRD). This MoS2-based nanocomposite modified glass carbon electrode (PtNPs@MoS2/GCE) exhibited excellent electrocatalytic activity toward dopamine (DA) and uric acid (UA) due to their synergistic effect. Two well-defined oxidation peaks of DA and UA were obtained at PtNPs@MoS2/GCE with a large peak separation of 160 mV (DA-UA), suggesting that the modified electrode could individually or simultaneously analyze DA and AA. Under the optimal conditions, the peak currents of DA and UA were linearly dependent on their concentrations in the range of 0.5–150 and 5–1000 µmol/L with detection limit of 0.17 and 0.98 µmol/L, respectively. The proposed MoS2-based sensor can also be employed to examine DA and UA in real samples with satisfactory results. Therefore, the PtNPs@MoS2 nanocomposite might offer a good possibility for electrochemical sensing and other electrocatalytic applications.
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