Poly(Diphenylamine) with Multi-walled Carbon Nanotube Composite Film Modified Electrode for the Determination of Phenol

摘要

In this study I report the electrochemical oxidation of phenol at a poly diphenylamine (PDPA)- multi- walled carbon nanotube (MWCNT) composite film modified glassy carbon electrode (GCE). PDPAwas polymerized on the MWCNT modified GCE by cyclic voltammetry (CV) in 0.1 M H2SO4. Thesurface morphology of PDPA-MWCNT was studied using scanning electron microscope (SEM). Theinterfacial electron transfer phenomenon at the modified electrode was studied using electrochemicalimpedance spectroscopy (EIS). The PDPA-MWCNT composite film showed good electrocatalyticbehavior towards the oxidation of phenol in pH 7. Phenol showed a well defined anodic peak at 0.65 V(vs. Ag/AgCl electrode). The MWCNT in PDPA-MWCNT film enhanced the anodic peak current by8.48 and 2.36 times than that of MWCNT/GCE and PDPA/GCE electrode. The peak current increasedlinearly with phenol concentration. The amperometric determination of phenol at the composite filmmodified electrode showed linear range from 9.8 to 80 M. This result shows that the proposedcomposite electrode may be developed for potential application in real sample analysis.