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To achieve highly sensitive nonenzymatic detection of H 2 O 2 , a novel electrochemical sensor based on Fe 3 O 4 –Ag nanocomposites was developed. Nanocomposites were synthesized by reducing [Ag(NH 3 ) 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 H 2 O 2  within a wide linear range of 0.5 μM to 4.0 mM, sensitivity of 135.4 μA mM −1  cm −2  and low detection limit of 0.2 μM ( S / N  = 3). Additionally, the sensor exhibits good anti–interference ability, stability and repeatability. These results show that the Fe 3 O 4 –Ag nanocomposite is a promising electrocatalytic material for sensors construction.

Synthesis of Fe 3 O 4 –Ag nanocomposites and their application to enzymeless hydrogen peroxide detection