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An electrochemically active composite film which contains multi-walled carbon nanotubes (MWCNTs)?incorporated with naphthol green B (NGB) was synthesized on glassy carbon, gold and indium tin?oxide electrodes by potentiodynamic method. The presence of MWCNTs in the composite (MWCNTs-NGB) film modified electrodes mediates redox reaction of FeIII/II present in NGB, whereas no redox?reaction of NGB occurred at the bare electrode. The electrochemical impedance spectroscopy studies?revealed that NGB and MWCNTs present in MWCNTs-NGB composite film enhances electron?shuttling between the reactant and electrode surface. The surface morphology of the MWCNTs and?MWCNTs-NGB were studied using atomic force microscopy, which revealed that NGB incorporated?and covered the MWCNTs on the modified electrode. The MWCNTs-NGB composite film exhibits?promising enhanced electrocatalysis towards S2O8
2. The response of S2O8?2 at MWCNTs and?MWCNTs-NGB composite films was measured using both cyclic voltammetry and i–t curve?techniques. The linear concentration range of S2O8?2 determination at MWCNTs-NGB composite film?was from 15.9 mM to 7.1 mM. The sensitivity of MWCNTs-NGB composite film towards S2O8
2 was?301.9 mA mM1 cm2, and the limit of detection was 6.9 mM. These above values are better than the?values obtained at MWCNTs film.