▎ 摘　　要

A nanocomposites of silver nanoparticles (Ag NPs)-polydopamine (PDA)-reduced graphene oxide (rGO) were synthesized at a gas/liquid interface. The gas/liquid interface will be appeared when the volatilized methyl aldehyde gas dissolved in to the solution and the Ag NPs will be formed by using CH2O as the reductant. Then, the nanocomposites were modified on a glassy carbon electrode (GCE) to construct a hydrogen peroxide (H2O2) sensor. The morphology and composition of the nanocomposites were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and fourier transform infrared spectroscopy (FTIR). The electrochemical investigation of the sensor reveals that it showed excellent catalytic property towards H2O2. The responses have a wide concentration range linear of 0.03-16 mM and 16-60 mM, the corresponding sensitivity of 28.1 mu A mM(-1) cm(-2), 40.27 mu A mM(-1) cm(-2), and a detection limit of 10 mu M at a signal-to-noise ratio (SNR) of 3. Furthermore, the sensor also exhibited good anti-interference, long-term stability and repeatability for H2O2 sensing. The present work offered a general platform for the synthesis of uniform distribution metal nanoparticles that might be extended to other fields.