Single-, Few-, and Multilayer Graphene Not Exhibiting Significant Advantages over Graphite Microparticles in Electroanalysis

摘要

This report compares the electroanalytical performancesnof single- (G-SL), few- (G-FL), and multilayer graphenen(G-ML), graphite microparticles, and edge-plane pyrolyticngraphite electrodes in terms of sensitivity, linearity, andnrepeatability. We show that in the case of differential pulsenvoltammetric (DPV) detection of ascorbic acid, the sensitivitynof a G-SL electrode is about 30% greater than thatnof G-ML and about 40% greater than graphite microparticles.nHowever, in the case of DPV determination of uricnacid, sensitivity is practically the same for all (G-SL, G-FL,nand G-ML) and, importantly, the graphite microparticlesndo provide higher sensitivity than graphenes do for thisnanalyte. Graphenes also do not provide a significantnadvantage in terms of repeatability. We pose the questionnof whether the efforts leading to the bulk method ofnproducing single-layer graphene are justified for electroanalyticalnapplications.