A novel Cu–Cu2O junction structure for the ultrasensitive detection of dopamine.

In this study, a Cu–Cu₂O junction structure was grown in situ on the surface of Cu plates via chemical etching at room temperature. A novel dopamine (DA) electrochemical sensor based on Cu–Cu₂O/glassy carbon electrode (Cu–Cu₂O/GCE) was constructed. The Cu–Cu₂O/GCE sensor exhibited a wide linear range of 0.03–2.45 mM and a low limit of detection of 7.1 nM (S/N = 3) for DA. The enhanced performance was due to the unique void structure, which increased catalytic active sites and electrochemical active surface areas. Moreover, the optimization of the Cu₂O–to–Cu ratio allowed for the effective regulation of the electron configuration of the Cu–Cu₂O junction structure. The Cu–Cu₂O/GCE sensor also exhibited good reproducibility, stability, and anti-interference ability. [ABSTRACT FROM AUTHOR]