▎ 摘　　要

A novel electrochemical sensor was fabricated using reduced graphene oxide (RGO) and Ag nanoparticle composite (RGO-Ag). The nanocomposite was synthesized via a facial simple one-pot hydrothermal method. The synthesized nanocomposite was characterized by a series techniques. The synthesized RGO-Ag nanocomposite has been used as an electrode modifier. The fabricated electrode was used for sensitive and selective determination of 4-NP. The proposed sensor exhibited a linear dependence on 4-NP concentration range from 1 to 500 mu M with a low detection limit of 0.114 mu M. In addition, our proposed 4-NP sensor also exhibited an outstanding stability, reproducibility and anti-interference property.