مشخصات پژوهش

In this study, a copper-printed circuit board (Cu-PCB) was utilized as a working electrode for an ethanol electrochemical sensor. The performance of the electrode was enhanced by modifying it with nickel-copper alloy oxides’ (NiO/CuO) nanopar- ticles. The preparation of the NiO/CuO-PCB electrode involved two main steps. First, a Cu/Ni alloy was deposited onto the surface of the Cu-PCB electrode through 8 chronopotentiometric cycles, resulting in the Ni/Cu-PCB electrode. In the second step, this alloy layer was converted into Cu/Ni alloy oxides by performing 40 consecutive cycles using the cyclic voltammetry (CV) method, leading to the creation of the NiO/CuO-PCB electrode. The morphological and structural characteristics, as well as the elemental composition of the modifed substrate, were analyzed using various characterization techniques, includ- ing feld-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray difrac- tion (XRD). The electrocatalytic properties and electrochemical behavior of the NiO/CuO-PCB electrode were thoroughly examined. The sensor's electrocatalytic performance for ethanol detection was assessed using both CV and amperometric methods. The limit of detection (LOD), limit of quantifcation (LOQ), and sensitivity for ethanol measurement via the CV technique were found to be 74 μM, 247 μM, and 8.916 mA M− 1 , respectively, while the amperometric technique yielded an LOD of 61 μM, LOQ of 203 μM, and sensitivity of 8.693 mA M− 1 . The sensor demonstrated a response in the concentration range of 1.8 to 2000 mM for ethanol detection. It was successfully applied to analyze ethanol content in alcoholic beverages.