To demonstrate the synergistic effect of the MWCNTs@PpPD-PB nanocomposites, cyclic voltammetry (CV) was used for characterizing the electrochemical properties of the composites modified GCE in N2 saturated 0.1 M KCl (pH2.7) aqueous solution at a scan rate of 50 mVs-1. Fig. 5 shows the CVs of the pristine GCE, GCE/MWCNTs, GCE/MWCNTs@PpPD, GCE/MWCNTs-PB, and GCE/MWCNTs@PpPD-PB in the absence of H2O2. The reversible pair of redox peaks are observed for MWCNTs-PB (Fig. 5(d)) and MWCNTs@PpPD-PB modified GCE (Fig. 5(e)), whereas no redox pair peaks are indicated to pristine GCE (Fig. 5(a)), MWCNTs (Fig. 5(b)) and MWCNTs@PpPD modified GCE (Fig. 5(c)).
A pair of well-developed redox waves corresponded to the interconversion between PB and PW. Between the observed redox peaks, the peak current of MWCNTs@PpPD-PB modified GCE is much larger than its MWCNTs-PB modified GCE, probably because of high electrical conductivity of the coated pPD polymer on the MWCNTs. After …show more content…
10(B) shows the calibration curve of the reduction peak currents vs. the concentration of H2O2. As shown, it presents the linear response region of MWCNTs-PB (Fig. 10(B) (a)) and MWCNTs@PpPD-PB (Fig. 10(B) (b)). The result of MWCNTs-PB modified GCE is similar to that of a previously reported study [67]. Fig. 10(B) (b) shows a linear response range from 0.005 mM to 2.225 mM with a correlation coefficient of 0.9993, and the sensitivity of the sensor was 583.6 µA mM-1 cm-2, which was much higher than that of the previous study estimated from GCE/MWCNTs-PB and GCE/MWCNTs/Ppy/PB. Moreover, the limit of detection of GCE/MWCNTs@PpPD-PB was calculated as 0.95 µM with a signal-to-noise ratio of 3. Table 1 summarizes the electrochemical characteristics of various modified electrodes containing PB for sensing H2O2, indicating that GCE/MWCNTs@PpPD-PB has high sensitivity and a wide linear range in comparison to those of other reported modified electrodes, proving improved electrical conductivity and good
A pair of well-developed redox waves corresponded to the interconversion between PB and PW. Between the observed redox peaks, the peak current of MWCNTs@PpPD-PB modified GCE is much larger than its MWCNTs-PB modified GCE, probably because of high electrical conductivity of the coated pPD polymer on the MWCNTs. After …show more content…
10(B) shows the calibration curve of the reduction peak currents vs. the concentration of H2O2. As shown, it presents the linear response region of MWCNTs-PB (Fig. 10(B) (a)) and MWCNTs@PpPD-PB (Fig. 10(B) (b)). The result of MWCNTs-PB modified GCE is similar to that of a previously reported study [67]. Fig. 10(B) (b) shows a linear response range from 0.005 mM to 2.225 mM with a correlation coefficient of 0.9993, and the sensitivity of the sensor was 583.6 µA mM-1 cm-2, which was much higher than that of the previous study estimated from GCE/MWCNTs-PB and GCE/MWCNTs/Ppy/PB. Moreover, the limit of detection of GCE/MWCNTs@PpPD-PB was calculated as 0.95 µM with a signal-to-noise ratio of 3. Table 1 summarizes the electrochemical characteristics of various modified electrodes containing PB for sensing H2O2, indicating that GCE/MWCNTs@PpPD-PB has high sensitivity and a wide linear range in comparison to those of other reported modified electrodes, proving improved electrical conductivity and good