Sensor performance DPV test

The prepared sensor was scanned by differential pulse voltammetry (DPV) with a homemade portable sensor in a 0.1 mol/L KCl solution containing 5.0 mmol/L K₃Fe(CN₆). The peak current of the sensor at this time was recorded as I₀; after that, the above sensor was immersed into 0.01 mol/L PBS containing different concentrations of imidacloprid solution with pH = 7 After the inhibition was completed, the sensor was scanned by differential pulse voltammetry (DPV), and the peak current of sensor was recorded as I. The inhibition rate (I%) of the sensor was calculated according to the following formula.