A Study On Multiwalled Carbon Nanotubes @ Poly ( P Phenylenediamine )

768 Words Dec 17th, 2015 4 Pages
In this study, multiwalled carbon nanotubes@poly(p-phenylenediamine)-prussian blue (MWCNTs@PpPD-PB) nanocomposites were synthesized and used for the nonenzymatic electrochemical detection of hydrogen peroxide (H2O2). The PpPD layer also helps the MWCNTs to be dispersed in the water together with the PB formation and fixing on the surface of the MWCNTs. Moreover, PpPD, a conductive polymer, increases the electronic conductivity and stability of MWCNTs. By combining the selectivity and catalytic capacity of PB for H2O2, a synergistic effect was observed for the H2O2 detection. The morphology and chemical composition of the MWCNTs@PpPD-PB nanocomposites were characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, and X-ray diffraction. A facile electrochemical H2O2 sensor based on the MWCNTs@PpPD-PB modifed glassy carbon electrode (GCE/MWCNTs@PpPD-PB) was prepared by the drop-casting method. Its electrochemical behavior was investigated using electrochemical impedence spectroscopy, cyclic voltammetry, and amperometry. The modified electrode exhibited a good electrocatalytic response for the reduction of H2O2 in acidic solution (pH 2.7). The proposed sensor exhibited a linear behavior in the concentration range from 0.005 mM to 2.225 mM for H2O2 with a high sensitivity and detection limit of 583.6 μAmM-1cm-2 and 0.95 μM (S/N = 3) at an applied potential of +0.15 V (vs. Ag/AgCl). The sensor showed excellent selectivity, reproducibility, and…

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