Fabrication of an electrochemical l-cysteine sensor based on graphene nanosheets decorated manganese oxide nanocomposite modified glassy carbon electrode

摘要

The graphene nanosheets/manganese oxide nanoparticles modified glassy carbon electrode (GC/GNSs/MnOx) was simply prepared by casting a thin film of GNSs on the GC electrode surface, followed by performing electrodeposition of MnOx at applied constant potential. The GC/GNSs/MnOx modified electrode shows high catalytic activity toward oxidation of L-cysteine. Hydrodynamic amperometry determination of L-cysteine gave linear responses over a concentration range up to 120μM with a detection limit of 75nM and sensitivity of 27nAμM~(-1). The GC/GNSs/MnOx electrode appears to be a highly efficient platform for the development of sensitive, stable and reproducible L-cysteine electrochemical sensors.