Electrochemical Detection with Platinum Decorated Carbon Nanomaterials

Here we performed amperometric detection of hydrogen peroxide (H2O2) using single‐walled carbon nanotubes (SWNTs), chemically converted graphene (CCG), and sulfonated CCG (CCG‐S) decorated with Pt nanoparticles (NPs). Although all three systems demonstrated similar detection limits for H2O2, compared to the other two nanomaterials, Pt‐SWNTs provided a higher sensitivity with only half of the Pt amount. This result was consistent with cyclic voltammetry, electrochemical impedance spectroscopy, and field‐effect transistor measurements. We attribute the higher sensitivity of Pt‐SWNTs to both the surface roughness of the electrode and the intimate contact between Pt NPs and one‐dimensional nanostructures (SWNTs) versus two‐dimensional nanostructures (graphene).