Impact Electrochemistry: Detection of Graphene Nanosheets Labeled with Metal Nanoparticles through Oxygen Reduction Mediation

We have prepared Pt/Fe‐ and Fe‐nanoparticle‐labeled graphene sheets and demonstrate that these sheets can be detected by using impact electrochemistry through oxygen reduction mediation. Crash course: Graphene sheets can be detected upon impact at the electrode surface when they are labeled with catalytic Fe/Pt or Fe nanoparticles by using an indirect detection mode. Upon impact, these Fe/Pt‐ or Fe‐labeled graphene sheets catalyze oxygen reduction, which leads to a significant reduction in current (see picture).