In this study, an oxide layer was formed by CV on a sensor IDEs by sweeping to a sufficiently high positive potential usually around 1.2 V (vs. Ag/AgCl). The electrode was subsequently swept cathodically, back to the initial potential, and the position of the oxide reduction peak minima was recorded. This process was iterated across various pH values using different buffers to establish the linearity of the technique. Fig. represents overlays of CVs scans of the gold oxide reduction peaks acquired at a sensor IDEs immersed in different buffer solution across the pH range from 5 to 8. The sensor IDEs was subjected to a scanning range from -0.1 to 1.2 V. In each case, three repeated scans were conducted to ascertain reproducibility. Notably, the reduction potential of the gold oxide was observed to move anodically with a decrease in pH in agreement with simulations. The decrease in current intensity is simply because the CV voltage window was kept constant and since the whole CV moves anodically, less gold oxide is produced within this window at lower pHs. The potential minima values of the oxide peaks for various pH levels were found to be reproducible across multiple scans, as validated by the minimal error bars in the calibration depicted in Fig. , which was fitted using a linear regression method. The graph demonstrated outstanding linearity with an R 2 value of 0.997 and a super Nernstian response of -71.4 mV.pH -1 (n = 3). This unequivocally suggests that the potential of the gold oxide can be effectively employed as a pH monitoring method throughout the duration of these experiments. The observed super Nernstian response may be attributed to the presence of a gold multilayer, a phenomenon seen in other metal oxides like ruthenium and iridium when employed as pH probes . It is worth noting that for prolonged durations, the dissolution of gold from the electrode could potentially constrain the effectiveness of this approach. Fig. shows the pH control experiments, in which the initial pH value of 7.5 (black curve) was chemically prepared and scanned by CV method whereas the pH 5.5 (red curve) was controlled from initial pH by applying a constant potential of 1.66 V at the protonator IDEs. As the pH control was activated, the gold oxide reduction potential moved anodically, indicating an anticipated decrease in pH.