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In this work, a novel method for electrode modification based on inkjet-printing of electrochemically synthesized graphene-PEDOT:PSS (GP-PEDOT:PSS) nanocomposite is reported for the first time. GP-PEDOT:PSS dispersed solution is prepared for use as an ink by one-step electrolytic exfoliation from a graphite electrode. GP-PEDOT:PSS layers are then printed on screen printed carbon electrodes (SPCEs) by a commercial inkjet material printer and their electrochemical behaviors are characterized towards three most common electroactive analytes including hydrogen peroxide (H2O2), nicotinamide adenine dinucleotide (NAD/NADH) and ferri/ferro cyanide (Fe(CN)6 redox couples. It is found that the oxidation signals for H2O2, NADH and K2Fe(CN)6 of PEDOT:PSS modified and GPPEDOT:PSS modified SPCEs are ~2-4 and ~3-13 times higher than those of unmodified SPCE, respectively. In addition, excellent analytical features with relatively wide dynamic ranges, high sensitivities and low detection limits have been achieved. Therefore, the inkjet-printed GPPEDOT:PSS electrode is a promising candidate for advanced electrochemical sensing applications.

P2.1.3 Inkjet-printed graphene-PEDOT:PSS modified on screen printed carbon electrode for sensing applications