Electrochemical behaviour of monolayer and bilayer graphene

TL;DR

This study investigates the electrochemical properties of monolayer and bilayer graphene flakes, revealing differences in charge transfer rates and demonstrating their potential as microelectrodes.

Contribution

It provides a comparative analysis of electrochemical behavior between monolayer and multilayer graphene using optical and Raman characterization.

Findings

Monolayer graphene exhibits higher charge transfer rate constants.

Both graphene types show quasi-reversible electrochemical behavior.

Methodology enables precise electrochemical characterization of graphene flakes.

Abstract

Results of a study on the electrochemical properties of exfoliated single and multilayer graphene flakes are presented. Graphene flakes were deposited on silicon/silicon oxide wafers to enable fast and accurate characterization by optical microscopy and Raman spectroscopy. Conductive silver paint and silver wires were used to fabricate contacts; epoxy resin was employed as masking coating in order to expose a stable, well defined area of graphene. Both multilayer and monolayer graphene microelectrodes showed quasi-reversible behavior during voltammetric measurements in potassium ferricyanide. However, the standard heterogeneous charge transfer rate constant, k{\deg}, was estimated to be higher for mono-layer graphene flakes.