Carbon Spheres Wrapped with Molybdenum Disulfide Nanostructure for Sensitive Electrochemical Sensing of 4-aminophenol

As a novel nanomaterial after graphene, molybdenum disulfide (MoS2) has potential applications in electrochemical sensing and other fields, while the low electric conductivity of MoS2 limits its application significantly. In this paper, carbon spheres (CSs) wrapped with molybdenum disulfide (CSs@MoS2) novel nanostructure was successfully prepared via a green hydrothermal method and then used for firstly electrochemical sensing of 4-aminophenol (4-AP, one toxic pollutant). The morphology and structure of CSs@MoS2 were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy and electrochemical impedance spectroscopy. As an electrochemical sensor, CSs@MoS2 nanohybrids modified electrode exhibits excellent electrochemical sensing performance toward 4-AP analysis owing to the synergetic advantages of MoS2 and CSs. Under the optimized conditions, the detection limit of 4-AP obtained in this work is 3 nM and the linear range is 0.01–18.00 μM.