ag nanoparticles decorated fe3o4/chitosan nanocomposite: synthesis, characterization and application toward electrochemical sensing of hydrogen peroxide

We studied a rapid, sensitive and selective amperometric sensor for determination of hydrogen peroxide by electrodeposited ag nps on a modified glassy carbon electrode (gce). the modified gce was constructed through a step by step modification of magnetic chitosan functional composite (fe3o4–ch) and high-dispersed silver nanoparticles on the surface. the resulted ag@fe3o4–ch was characterized by various analytical methods including fourier transform infrared spectroscopy, x-ray diffraction, transmission electron microscopy, scanning electron microscopy and cyclic voltammetry. the proposed sensor employed ag@fe3o4–ch/gce as the working electrode with a linear current response to the hydrogen peroxide concentration in a wide range from 0.01 to 400 µm with a low limit of detection (lod = 0.0038 µm, s/n = 3). the proposed sensor showed superior reproductivity, sensitivity and selectivity for the detection of hydrogen peroxide in environmental and clinical samples.