Electrochemical collision of single graphene oxide sheets at ultramicroelectrodes and its usage as substrate for Pt nanoparticle deposition

Abstract

AbstractRevealing the physiochemical properties of individual graphene oxide (GO) sheets is highly desired for both fundamental research interests and practical applications, especially for their surface functionalization and modification toward hybrid composites with high performance. Herein, we report three different strategies including surface blockage, capacitive charging, and electrochemical reduction to detect and study single GO sheets using single‐entity electrochemical methods. The size, surface charge, dielectric, and electrochemical features of single GO sheets can then be revealed and quantified from the transient current signals. Moreover, the adsorbed GO can confine the electrode surface for metal deposition and produce single Pt nanoparticles, as indicated by the discrete reductive spikes shown in the deposition processes.