Enhancing electrochemical sensitivity of screen printed carbon electrode by inkjet printed graphene-PEDOT/PSS Layers

In this study, graphene-PEDOT/PSS is inkjet printed on screen printed carbon paste electrode (SCE) to enhance the electrochemical sensitivity of the electrode. The graphene-PEDOT/PSS dispersed solution was prepared for used as an ink by electrochemical synthesis. A graphene-PEDOT/PSS layer was printed on a SCE by Dimatrix material inkjet printer and its electrochemical behaviors were characterized toward standard salbutamol solution. It is found that the oxidation peak amplitudes of PEDOT:PSS modified and graphene-PEDOT/PSS modified SCE electrodes are approximately 30 and 150 times higher than that of unmodified SCE electrode, respectively. In addition, good analytical features with wide dynamic working range of more than 500 μM and low detection limit (3S/N) of 1.25 μM are achieved. Thus, graphene-PEDOT/PSS is a promising electrochemical sensing material and inkjet printing technique is a practical method for application of advanced electrode materials for electrochemical sensing applications.