Preparation of Prussian blue@Pt nanoparticles/carbon nanotubes composite material for efficient determination of H2O2

In this study, the fabrication of an efficient amperometric hydrogen peroxide sensor with favorable properties is presented. Prussian blue (PB) was catalytically synthesized by Pt nanoparticles (Ptnano) from ferric ferricyanide aqueous solution to form PB@Ptnano hybrid, and it was confirmed by transmission electron microscope (TEM) and optical spectra. The electrochemical behavior of PB@Ptnano was highly improved through its integration with poly(diallyldimethylammonium chloride) modified carbon nanotubes (PCNTs). The obtained PB@Ptnano/PCNTs composite was used to modify the glassy carbon (GC) electrode, developing an electrochemical sensor for detecting H2O2. In the optimized operational conditions (E = 0.1 V, pH 2.0), the response time and detection limit (S/N = 3) of this sensor were determined to be below 2 s and 0.15 μM, respectively. Compared with the PB@Ptnano sensing system, the determination by the PB@Ptnano/PCNTs sensor was much more improved, with a wider linear range, a lower limit of detection, and a higher sensitivity. Interference study and operational stability of the sensor were investigated, meanwhile, influence of the amount of PB@Ptnano upon the sensor sensitivity was also discussed.