Flower-like Bi2S3 nanostructures grown on nitrogen-doped reduced graphene oxide for electrochemical determination of hydrogen peroxide.

This paper reports a facile solvothermal method for the synthesis of Bi 2 S 3 flower-like nanostructures grown in situ on a nitrogen-doped reduced graphene oxide (Bi 2 S 3 @N-G) surface. Thiourea was used as the nitrogen source and reducing agent for graphene oxide. The surface morphology of the as-prepared Bi 2 S 3 @N-G composites was analyzed by field emission scanning electron microscopy and transmission electron microscopy. The crystalline structure and surface chemical states were examined by X-ray diffraction and X-ray photoelectron spectroscopy, respectively. The as-prepared Bi 2 S 3 @N-G composite was deposited on a glassy carbon (GC) electrode, and the modified electrode was employed for the electrocatalytic detection of H 2 O 2 . The calculated diffusion coefficient and catalytic rate constant of the Bi 2 S 3 @N-G modified electrode were 4.9 × 10 −6  cm 2  s −1 and 5671 M −1  s −1 , respectively. The Bi 2 S 3 @N-G/GC electrode demonstrated a wide concentration range for H 2 O 2 , from 10 to 42,960 μM, with a sensitivity of 0.1535 μA μM −1 and an obtained limit of detection of 1.9 μM. [ABSTRACT FROM AUTHOR]