Synthesis, structural and optical properties of gold nanoparticle-graphene-selenocysteine composite bismuth ultrathin film electrode and its application to Pb(II) and Cd(II) determination

Abstract

The transparency of the gold nanoparticle-graphene-selenocysteine composite is 90–98% in the visible range. The optical and transport energy gaps were estimated as 1.15 eV and 2.25 eV respectively. A new electrochemical method using gold nanoparticle-graphene-selenocysteine modified bismuth film glassy carbon electrode, was applied to improve the performance of the simultaneous determining trace cadmium and lead in square wave anodic stripping voltammetry with a detection limit of 0.08, and 0.05 ppb for metal ions, with a high correlation coefficient of 0.9811 and 0.99, respectively. Finally, the gold nanoparticle-graphene-selenocysteine modified bismuth film glassy carbon electrode was successfully applied for the determination of cadmium, and lead in environmental samples and the results were successful.