SUMMARY
Graphene/polymer composite thin film electrodes have many important applications, but it is still difficult to fabricate them because of poor processability of graphene. This paper presents the primary results on using 3D printing technique for thin film electrode preparation from graphene-based composite ink. The printing ink was synthesized from graphene oxide, polyvinyl alcohol (PVA) as a binder and stabilizer, and ascorbic acid (AA) as a reducing agent. The measured zeta potential value showed that PVA can make GO ink more stable, the absolute value of zeta potential increased from 10.1 mV (without PVA) to 31.4 mV (with 12 wt. % PVA). The thin film electrodes can be easily printed using GO/PVA/AA composite ink, and GO has been reduced by AA that showed clearly on the voltammograms recorded in 5mM K3[Fe(CN)6]/K4[Fe(CN)6] solution. The best electrochemical properties of printed electrodes were obtained in the case of composite ink prepared with wt/wt ratio GO:PVA:AA = 80:12:8. The cyclic voltammetric results demonstrate also the linear relationship between anodic and cathodic signals of redox couple [Fe(CN)6]4-/K3[Fe(CN)6]3- and square root of scan rate that indicates well a reversible redox reaction on the electrode surface. The thin film printed from GO/PVA/AA composite ink can be used as electrode materials for diverse applications in electrochemistry.