One step controllable electrochemical deposition of silver hexacyanoferrate nanoparticles/multi-wall carbon nanotubes/Nafion modified electrode for the sensing of phenol

A novel silver hexacyanoferrate nanoparticles (AgHCFNPs) were synthesized through one step controllable electrochemical deposition. An AgHCFNPs/multi-wall carbon nanotubes (MWNTs)/Nafion modified glassy carbon electrode (GCE) was fabricated. Scanning electron microscopy (SEM) and electrochemical methods were used to characterize the AgHCFNPs/MWNTs/Nafion/GCE. The SEM images showed that the AgHCFNPs was evenly immobilized on MWNTs. The size of AgHCFNPs was examined around 100 nm. The AgHCFNPs/MWNTs/Nafion/GCE was used for the determination of phenol in 0.1 M KH2PO4—0.1 M K2HPO4 buffer solution (pH 8.0). Under the optimal conditions, the current response of phenol increased linearly with its concentration from 0.6 to 60.0 µM, and the limit of detection was found to be 0.2 µM. The practical application of the present modified electrode was demonstrated by measuring the concentration of phenol in real water samples.