A facile one-step synthesis of prussian blue/polyaniline/graphene oxide nanocomposites for electrochemical sensing of hydrogen peroxide

• Prussian blue/polyaniline/graphene oxide (PB/PANI/GO) nanocomposites were synthesized through a facile one-step approach.
• In the process, aniline acted as both the precursor of PANI and the reductant for FeCl3–K3[Fe(CN)6], making polymerization of aniline and anchoring of PB nanoparticles on PANI/GO occur simultaneously.
• PB/PANI/GO nanocomposites were employed to fabricate H2O2 sensor.
• This sensor exhibited remarkable catalytic performance for H2O2 detection.

Prussian blue/polyaniline/graphene oxide (PB/PANI/GO) nanocomposites were synthesized and used for electrochemical sensing of hydrogen peroxide (H2O2). PB/PANI/GO nanocomposites were synthesized through a facile one-step approach, where aniline acted as both the precursor of PANI and the reductant for FeCl3–K3[Fe(CN)6], therefore making polymerization of aniline and anchoring of PB nanoparticles on PANI/GO occur simultaneously. Then, the nanocomposites were characterized by transmission electron microscopy (TEM), X-ray diffraction spectroscopy (XRD), fourier transform infrared spectroscopy (FTIR) and electrochemical techniques. The results indicated that PB nanoparticles with the size of about 4.0 nm were homogeneously distributed on the surface of PANI/GO, which made the sensor based on PB/PANI/GO exhibit an excellent performance toward H2O2 detection with a wide linear range of 5.0 μM to 1.275 mM, a sensitivity of 60.16 μA mM−1 cm−2 and a low detection limit of 1.9 μM (S/N = 3).