Fig. 3From: Simultaneous and sensitive determination of ascorbic acid, dopamine and uric acid via an electrochemical sensor based on PVP-graphene compositeCVs of different electrodes: a GCE, b PVP/GCE, c GR/GCE and d PVP-GR/GCE. Solution: 1.0 mM K3[Fe(CN)6] in 1.0 M KCl; Scan rate: 0.1 V s−1Back to article page