Investigation of ionic liquid effect on the electrocatalytic performance of manganese/multi-walled carbon nanotubes nanohybrid for paracetamol oxidation

Ionic liquids (ILs) are kinds of important solvents with unique properties of good ionic conductivity, high viscosity, low toxicity, negligible vapor pressure, high chemical and thermal stability ]1[. Hence, it has been widely applied in electrochemistry. On the other hand, carbon nanotubes (CNTs) have been receiving considerable attention in various areas due to their unique mechanical, electrical and chemical properties [2]. Due to non-covalent (π-π) interactions between the loop of imidazole IL and the π electron of CNTs, combination of IL and CNTs could provide an outstanding synergistic increase presentation like good electronic and ionic conductivity, high electro chemical stability, and good biocompatibility ]3[. Herein, Mn-MWCNTs nanohybrid was prepared by mixing a suspension of MWCNTs and Mn(OAc)2 followed by reduction with hydrazine monohydrate in alkaline solution. Then, a homogenous mixture of the hybrid, paraffin oil, graphite powder and IL was used for construction of a novel electrochemical sensor for determination of paracetamol at phosphate buffer solution (pH=7.0). The obtained results showed that on the Mn-MWCNT/IL/CPE, the oxidation peak potential shifted to more negative directions with a higher oxidation peak current than that the CPE attributing to the presence of IL as the binder/modifier due to higher conductivity, fast electron transfer rate, good anti-fouling properties, intrinsic catalytic ability and adsorptive behavior.