Electrodeposited Anisotropic Pt Nanoarrays for Broad-Range Electrochemical Biosensing

Hydrogen peroxide-mediated electrochemical biosensors often suffer from signal saturation at elevated analyte concentrations, which limits their usable linear range.Here, we report morphology-engineered platinum nanoarray (PtNA) biointerfaces formed on a commercial carbon screen-printed electrode (SPE) by controlled electrodeposition.The resulting electrode is hereafter denoted as PtNA/Carbon SPE.By tuning deposition potential and time, anisotropic Pt nanoarray-like architectures with increased electrochemically accessible surface area were obtained.Electrochemical impedance spectroscopy under the ferri/ferrocyanide probe condition indicated very low apparent charge-transfer resistance, while the amperometric results were consistent with a contribution from concentration-dependent utilization of