Macroporous flower-like graphene-nanosheet clusters used for electrochemical determination of dopamine

Well-defined flower-like graphene-nanosheet clusters (f-RGO) have been facilely and cost-effectively fabricated by electrochemical method on the surface of a glassy carbon electrode (GCE). The obtained f-RGO was directly used for the detection of dopamine (DA) via cyclic voltammetry (CV) and differential pulse voltammetry (DPV) technique. The structure of f-RGO was confirmed by scanning electron microscopy (SEM). It is observed that the f-RGO exhibits typical flower-like interconnected macroporous architecture, which contributes much to the high performance toward DA detection as compared with that of the layer-stacking RGO. For f-RGO, DPV measurement gives a wide liner range from 5 μM to 70 μM and 100 μM to 600 μM, respectively, and a good detection limit of 3 μM (S/N = 3) for the determination of DA. Moreover, the determination of DA with f-RGO is highly selective and reproducible, with a relative standard deviation of 3.0%.