Development of 4-aminophenol sensor based on Co-MoS2 nanomaterials decorated on glassy carbon electrode using electrochemical technique

The present research discusses the incorporation of cobalt (7.5 and 10 wt%) in exfoliated MoS₂ nanosheets via hydrothermal route. Phase purity and crystal structure of prepared Co doped MoS₂ were confirmed with XRD. To observe the attached functional groups and presence of Mo-O characteristic peak, FTIR was used. Optical properties, surface morphology and agglomeration of layers were visualized through UV/Visible spectroscopy, FESEM and HR-TEM, respectively. In this study, sensitive 4-aminophenol (4-AP) sensor was fabricated with Co-MoS₂ nanomaterials (NMs) decorated on glassy carbon electrode (GCE) using electrochemical approach. The parameters of developed 4-AP sensor were systematically calculated from the calibration curve by using current versus concentration. The sensor probe response was found linear over 0.1 nM to 0.01 mM, which is known as linear dynamic range (LDR). The slope of LDR was used to calculate the sensitivity of the proposed sensor, which was measured by considering the active surface area of GCE (0.0316 cm²). It was found to be 43.0127 µAµM-¹cm⁻². The limit of detection (LOD; 93.48 ± 4.67 pM) of the 4-AP sensor was evaluated from the slope of the calibration curve. Other sensor parameters, such as reproducibility, repeatability, response time, validity, and stability of the fabricated sensor were found to be outstanding. The 4-AP sensor constituting Co-MoS₂ NMs deposited on GCE developed by employing an electrochemical approach was perceived to be an efficient sensor for real-time analysis of environmental and extracted samples.