Electrochemical detection of Cu2 + using graphene–SnS nanocomposite modified electrode

In this paper, an electrochemical copper ion (Cu2 +) sensor was constructed based on a glass carbon electrode (GCE) modified with SnS nanosheets supported on graphene (Gr–SnS). The electrochemical behaviors towards Cu2 + were investigated by cyclic voltammetry and linear sweep voltammetry in 1.0 M acidity KCl solution with the pH at 4.5. After optimizing the proportion of SnS to Gr, the best proportion is 2:1. The electrochemical result shows that Gr–SnS nanocomposite modified electrode exhibits good electrochemical performance towards Cu2 + and the reduction peak current was proportional to the Cu2 + concentration in the range from 1.5 to 36.0 μM with a detection limit of 0.02 μM (S/N = 3). Besides, the Cu2 + sensor showed a good anti-interference performance, high stability and excellent regeneration capability.