Prior to each experiment, the GC working electrode underwent a series of preparation steps. It was polished with a 0.3 µm and then 0.04 μm Al 2 O 3 slurry (PRESI) and then subjected to sonication in water and then in acetonitrile, for 2 minutes in each solvent. The electrode was then rinsed with acetonitrile. Electrochemical grafting was performed in a three-electrode cell containing 2 mL of a 0.1 M nBu4NPF6 solution in acetonitrile, with a concentration of 10 -3 M of dC12TEMPO. The grafting potential was then applied to generate aryl radicals from diazoniums. After deposition of the organic layers, the functionalized GC electrodes were washed with CH3CN, sonicated in pure CH3CN, then in CH2Cl2 for 2 minutes in each solvent. The modified electrodes were then immersed in a CH2Cl2 solution containing 40 mM of 2,6-lutidine for 2 minutes under stirring. Afterward, the modified electrodes were subjected to ultrasonic treatment in CH2Cl2 to eliminate any triggered base molecule within the attached organic layer. The surface coverage of TEMPO groups was estimated by analyzing cyclic voltammograms obtained in a 0.1 M nBu4NPF6/dichloromethane solution. The surface coverage (Γ) was calculated using the formula Γ = Q/nFS, where Q is the charge estimated by integrating the oxidation peak on the cyclic voltammogram, n = 1 is the number of electrons involved, F = 96485 C.mol -1 is the Faraday constant, and S = 0.07 cm 2 is the surface area of the electrode. All experiments were performed at room temperature, at approximately 293 K.