A novel Cu-Cu2O hetero-structure for ultrasensitive detection of dopamine

Abstract

Herein, Cu-Cu2O heterostructure were grown in situ on the surface of Cu nanoplates by chemical etching at room temperature. A novel dopamine (DA) electrochemical sensor based on Cu-Cu2O/glass carbon electrode (Cu-Cu2O/GCE) was constructed. The Cu-Cu2O/GCE sensor showed a wide linear range of 0.001 mM to 2 mM and a low limit of detection (LOD) of 7.1 nM (S/N = 3) for DA. The improved performance of the Cu-Cu2O/GCE is attributed to the special void structure which increases the catalytic active sites and electrochemical active surface areas (ECSA). Besides, the optimization of Cu2O and Cu ratio effectively regulates the electron configuration of the Cu-Cu2O heterojunction. The Cu-Cu2O/GCE sensor also showed good reproducibility, stability, and excellent anti-interference ability.