Modification of CuO Nanorods on SPCE for EIS Measurement of Organophosphate Pesticides

With tunable properties and stability, nonenzymatic pesticide sensors have the potential to be a robust sensing platform for pesticide analysis. In this letter, we successfully modified a screen-printed carbon electrode with copper oxide nanorods through electrochemical deposition and anodization. The fabricated sensor is then tested for its performance in repeatability and reproducibility using cyclic voltammetry. Consequently, electrochemical impedance spectroscopy is used to evaluate organophosphate pesticide sensing capability. The sensor shows great repeatability and reproducibility with a low relative standard deviation (<5%). From the experiment, the sensor has the ability to detect organophosphate pesticides down to 0.247 parts per billion and shows high sensitivity using electrochemical impedance spectroscopy. This demonstrates that the CuO nanorods-modified screen-printed carbon electrode electrochemical sensors are a promising system for in-situ residual pesticide testing.