One-pot synthesis of α-Fe_2O_3 nanoparticles-decorated reduced graphene oxide for efficient nonenzymatic H_2O_2 biosensor

摘要

Hematite nanoparticles (α-Fe_2O_3) are successfully decorated on the reduced graphene oxide (rGO) sheets through a simple, one-step, hydrothermal method without addition of other reducing agents. The α-Fe_2O_3/rGO hybrid was characterized by scanning electron micrographs, X-ray diffraction, X-ray photo-electron spectroscopy, and Raman spectroscopy. This α-Fe_2O_3/rGO hybrid has been successfully applied in the catalytic performance toward the reduction of H_2O_2. The nonenzymatic sensor demonstrates a linear relationship over a wide concentration range of 5.0-4495.0 μM (R=0.9998), a low detection limit of 1.0 μM, and a high sensitivity of 126.9 μAcm~(-2)mM~(-1) to the detection of H_2O_2.