Amperometric Non-Enzymatic Hydrogen Peroxide Sensor Based on Aligned Zinc Oxide Nanorods

Zinc oxide (ZnO) nanorods (NRs) have been synthesized via the hydrothermal process. The NRs were grown over a conductive glass substrate. A non-enzymatic electrochemical sensor for hydrogen peroxide (H(2)O(2)), based on the prepared ZnO NRs, was examined through the use of current-voltage measurements. The measured currents, as a function of H(2)O(2) concentrations ranging from 10 μM to 700 μM, revealed two distinct behaviours and good performance, with a lower detection limit (LOD) of 42 μM for the low range of H(2)O(2) concentrations (first region), and a LOD of 143.5 μM for the higher range of H(2)O(2) concentrations (second region). The prepared ZnO NRs show excellent electrocatalytic activity. This enables a measurable and stable output current. The results were correlated with the oxidation process of the H(2)O(2) and revealed a good performance for the ZnO NR non-enzymatic H(2)O(2) sensor.