Electrochemical sensors for dopamine using graphene-cobalt(II) complex modified glassy carbon electrode by adsorptive voltammetry

[co(bdmpzm)2(ncs)2] (bdmpzm=bis(3,5-dimethylpyrazol-1-yl)methane) was dispersed in graphene oxide (gox). composite gox-[co(bdmpzm)2(ncs)2] was deposited on a glassy carbon electrode (gce) and reduced at -1.0 by 60 s. the modified electrode rgox-[co(bdmpzm)2(ncs)2]/gce allowed the oxidation for dopamine (da) at 0.41 v our results showed reversible and sensitive process,(δv 0.09 v) compared with the electrode without modified in buffer phosphate solution ph 3.0. the detection limit (3σ/b) for dopamine was 0.11 μmol l-1 and the rsd was 3.0%. the presence of uric acid and ascorbic acid did not interfere with the signal for dopamine. © 2016 by cee (center of excellence in electrochemistry).