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Hydrogen peroxide (H 2 O 2 ) as a crucial signal molecule plays a vital part in the growth and development of various cells under normal physiological conditions. The development of H 2 O 2 sensors has received great research interest because of the importance of H 2 O 2 in biological systems and its practical applications in other fields. In this study, a H 2 O 2 electrochemical sensor was constructed based on chalcogenide molybdenum disulfide-gold-silver nanocomposite (MoS 2 -Au-Ag). Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive spectroscopy (EDS) were utilized to characterize the nanocomposites, and the electrochemical performances of the obtained sensor were assessed by two electrochemical detection methods: cyclic voltammetry and chronoamperometry. The results showed that the MoS 2 -Au-Ag-modified glassy carbon electrode (GCE) has higher sensitivity (405.24 µA mM -1 cm -2 ), wider linear detection range (0.05-20 mM) and satisfactory repeatability and stability. Moreover, the prepared sensor was able to detect the H 2 O 2 discharge from living tumor cells. Therefore, this study offers a platform for the early diagnosis of cancer and other applications in the fields of biology and biomedicine.

sensors

An Electrochemical Sensor Based on Chalcogenide Molybdenum Disulfide-Gold-Silver Nanocomposite for Detection of Hydrogen Peroxide Released by Cancer Cells