Based on previous studies, two hypotheses can account for the reduced surface concentration observed in electroactive-rich dC12TEMPO grafting solutions: -Radical scavenging: TEMPO in its radical form (-N-O•) acts as a scavenger for the aryl radicals generated during the electroreduction of aryldiazonium salts. This scavenging reduces the concentration of aryl radicals available to react with the electrode surface, thereby hindering the grafting process.