Controlling assembly-induced single layer RGO to achieve highly sensitive electrochemical detection of Pb(II) via synergistic enhancement

Abstract In this work, the preparation of a single-layer nanocomposite electrode material with good electron transfer through controlled assembly was studied, and it was used for high-sensitivity electrochemical detection of Pb2+. Mechanism studies have found that single-layer graphene nanostructures bring significant advantages to electron transfer along RhB/RGO nanocomposite electrode material. This solving the main obstacle of low electron transfer caused by aggregation in electroanalysis. Moreover, since RhB has good metal ion adsorption capacity, it helps to enhance the interfacial adhesion between graphene and target metal ions. Through the synergistic enhancement of RhB and RGO, RhB/RGO shows high sensitivity in Pb2+ trace analysis. The detection limit is 10 nM, and the linear correlation coefficient is 0.9999. RhB/RGO/GCE sensors have been used to detect Pb2+ in environmental water. In addition, the competitive relationship between the active binding site and the electron transfer resistance (Rct) in the detection of Pb2+ was studied. This provides a reference for the design of electrode materials in the future.