▎ 摘　　要

In this paper, we report the application ofBougainvillea glabraflower extract as a green-reducing agent for the reduction of chemically prepared graphene oxide (GO). The removal of oxygen-containing functional groups after reduction of GO was due to the presence of phenolic compounds in the flower extract ofBougainvillea glabra. Towards the sensing of Pb2+, a simple drop-casting technique was adopted to fabricate the sensing element by modifying the surface of screen-printed carbon electrode (SPCE) with rGO-nafion nanocomposite. Differential pulse voltammetry was employed as an electroanalytical technique to study the sensing capability of the proposed electrode for different concentrations of Pb2+. The fabricated SPCE exhibited a low limit of detection of 0.05 nM toward Pb(2+)with an improved sensitivity of 25.273 mu A nM(-1)over a linear range of 0.05-8.67 nM.