Abstract:
Detection of chemical compounds has always been a significant concern since it covers a wide range of areas ranging from environmental control to clinical diagnosis. With the advancement of nanotechnology, using carbon nanomaterials in the sensing field has improved the sensors' signal response. Standard analytical techniques characterized the as-prepared materials (pristine and nanocomposites). Here, we synthesized composites of MoS2 and CuPc of different ratios 1:0.5, 1:1, and 1:2. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV) were used to characterize and evaluate the performance of the prepared nanosensors. The characteristics of the as-prepared nanosensors, like accuracy, reproducibility, repeatability, selectivity, linear range, the limit of detection (LoD), the limit of quantification (LoQ), and sensitivity, were also evaluated. The respective values of LoD, LoQ, and sensitivity for the concentration studies with CV for the linear range 1-300 μM is 4.70 μM, 15.68 μM and 0.21 μA μM-1 cm-2, and for the linear range 350-1000 μM is 11 μM, 36.6 μM and 0.091 μA μM-1 cm-2, respectively. For the DPV, the values of LoD, LoQ, and sensitivity with the linear range 1-200 μM is 8.21 μM, 27 μM, and 0.06 μA μM-1 cm-2, and for linear range 200-800 μM is 3.13 μM, 10.45 μM and 0.19 μA μM-1 cm-2, respectively. But here, MoS2 as a pristine compound gave more electrochemical response towards dopamine sensing. In the first half with the linear range 1-300 μM, the value of LoD, LoQ, and sensitivity with CV for MoS2 is 22.1 μM, 73.8 μM and 0.12 μA μM-1 cm-2, and for the linear range 500-1000 μM is 22.5 μM, 75 μM and 0.12 μA μM-1 cm-2, respectively and with DPV and linear range1-300 μM is 0.4 μM, 1.36 μM and 0.07 μA μM-1 cm-2 and for the linear range 500-1000 μM is 0.48 μM, 1.6 μM and 0.06 μA μM-1 cm-2, respectively.
