Synthesis of Fe3O4-Ag nanocomposites and their application to enzymeless hydrogen peroxide detection

To achieve highly sensitive nonenzymatic detection of H2O2, a novel electrochemical sensor based on Fe3O4-Ag nanocomposites was developed. Nanocomposites were synthesized by reducing [Ag(NH3)(2)](+) at the gas/liquid interface in the presence of silver seeds and confirmed by transmission electron microscopy and X-ray diffractometry. Electrochemical investigations indicate that the sensor is able to detect H2O2 within a wide linear range of 0.5 mu M to 4.0 mM, sensitivity of 135.4 mu A mM(-1) cm(-2) and low detection limit of 0.2 mu M (S/N = 3). Additionally, the sensor exhibits good anti-interference ability, stability and repeatability. These results show that the Fe3O4-Ag nanocomposite is a promising electrocatalytic material for sensors construction. (C) 2015 Institute of Chemistry, Slovak Academy of Sciences