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[ VOLUME 6 I ISSUE 2 I APRIL– JUNE 2019] E ISSN 2348 –1269, PRINT ISSN 2349-5138 electrode, CR-CdSe QDs electrode showing an enhanced electrocatalyic behavior of curucmin with increased in background current was due to the presence of CdSe QDs. An oxidation peak potential (Epa) at +0.23V and reduction peak (Epc) at +0.17V with the Ep of 60 mV/n representing the redox process of CR-CdSe QDs is reversible [25] which is expected to be equal to the value 56.5mV/n for a standard reversible system. Also the variation between the anodic peak current (ipa) and cathodic peak current (ipc) for a reversible redox couple is said to be ipa/ ipc = 1. Herein for the CR-CdSe QDs electrode showing ipa/ ipc =0.99, respectively. Fig.4. Cyclic voltammograms of various electrodes (a) Bare (b) CR functionalized CdSe QDs, (c) CR modified electrodes (Potential scan from -0.3 V to 0.8 V) in 0.1 M phosphate buffer solution (pH 7.02) at the scan rate of 50 mVs-1 3.3. Effect of scan rate In a CV experiment, by altering the scanning speed of the potential in both forward and reverse direction provides sufficient information about the electrochemical behavior of the curcumin functionalized CdSe QDs. Hence the CR-CdSe QDs modified electrode was subjected to CV analysis at different scan rate The electrode was scanned in the potential window from -0.2 V to 0.5 V. Figure 5 0.1 M phosphate buffer solution (pH 7.02). As the scan rate increases, the oxidation peak current also increases. Supporting the study, figure 5(ii) shows the graph plot corresponding to the oxidation peak current versus different scan rate shows a linear relationship at scan rate above 50 mVs-1. Thus the electrochemical oxidation of curcumin functionalized CdSe QDs is found to be surface confined process. range from 5 to 150 mVs-1. shows (i) the CV curve for CR-CdSe QDs modified electrode at different scan rate in Fig.5. (i) Cyclic voltammetric studies on effect of scan rate from 5 to 150 mVs-1 using CdSe QDs modified electrode (Potential scan from -0.2 V to 0.5 V) in 0.1 M phosphate buffer solution (pH 7.02). (ii) Corresponding linear plot. 3.4. Analysis of ascorbic acid The static analysis of ascorbic acid using cyclic voltammetry techniques was carried out under optimized condition. During CV scan with different concentration ascorbic acid, the cathodic peak corresponding to the oxidation of AA appeared at +0.0V. With the addition of 10 μL of 0.01M AA in 0.1 M phosphate buffer, the mediator peak shifted towards the lower potential. The CR-CdSe QDs mediator facilitates the oxidation of AA in the lower potential at +0.05V. As the concentration of AA increases in 0.1 M phosphate buffer solution with successive addition of 0.01M AA in 50 ml electrolyte, a steady increase in the anodic current was observed in the CV curve. From figure 6(i), showing the CV analysis for linear addition of 312 IJRAR- International Journal of Research and Analytical Reviews Research PaperPDF Image | Curucmin functionalized cadmium selenide quantum dots
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