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Silver nanoparticles were prepared by chemical reduction of acetaldehyde gas in the absence of protective gas, and Ag/FePO4 nanocomposites were synthesised by modified silver mirror reaction at a gas-liquid interface. A hydrogen peroxide (H2O2) electrochemical sensor was constructed through immobilizing Ag/FePO4 nanocomposites on gold (Au) electrode. The morphology and composition of the nanocomposites were characterized by transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS). The electrochemical investigations of the sensor indicated that it exhibited excellent analytical performance with a wide linear range from 3.0×10−5 to 1.1×10−2 mol⋅L−1 and a low detection limit of 4.7 μmol⋅L −1 at a signal-to-noise ratio of 3. Meanwhile, it also showed acceptable reproducibility and anti-interference ability. This study may provide a new method for the synthesis of highly dispersed metal nanoparticles which might be used in other related fields.

Synthesis of silver nanoparticles-decorated FePO4 nanosphere at a gas-liquid interface for the electrochemical detection of Hydrogen peroxide