Carbon Paste Electrode Modified with Carbon Nanotubes and Poly(3-Aminophenol) for Voltammetric Determination of Paracetamol

摘要

In this research, carbon paste electrode (CPE) was modified with carbon nanotube (CNT) and poly(3- aminophenol) and the modified electrode was used for voltammetric determination of paracetamol.The CNT used to modify CPE was synthesized using spray pyrolysis technique and characterizedusing Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and EnergyDispersive X-Ray (EDX) techniques. Modification of CPE was conducted firstly by dispersing CNTon the surface of CPE from its N,N-Dimethil fomamide (DMF) suspension and then CNT was trappedin poly(3-aminophenol) through electropolymerization of 3-aminophenol on the surface of CPE.Characterization of the modified electrode was conducted with squarewave voltammetry (SWV)technique. Oxidation peak of paracetamol was 450 mV vs Ag/AgCl(3 M NaCl). Oxidation current ofparacetamol obtained with the modified CPE was significantly higher than that obtained with bare-5 -4 CPE. The best calibration curve for paracetamol was in the concentration range of 10 M 10 Mwith limit of detection (3 of 1,1 M. Results of paracetamol determination in real sample with themodified electrode were in good agreement with those of HPLC method.