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Keywords:

  • Electrochemical sensors;
  • Manganese oxide nanoparticles;
  • Graphene nanosheets;
  • L-Cysteine

Abstract

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 120 µM with a detection limit of 75 nM and sensitivity of 27 nA µM−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.