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[VOLUME 6 I ISSUE 2 I APRIL – JUNE 2019] e ISSN 2348 –1269, Print ISSN 2349-5138 http://ijrar.com/ Cosmos Impact Factor 4.236 size can't be defined. Figure. 3(c) is the TEM image of CdSe QDs (scal bar- 50 nm) without curcumin functionalization. As the CdSe QDs particles are clearly visible with the each particle size ranges from 6 to 8 nm. Figure. 3(d) is the SAED pattern for CR-CdSe QDs where multi-centric ring appeared for the core-shell broadening of diffuse halo rings was due to decrease in the inter-atomic spacing. Fig.3. HR-TEM image of CR-CdSe QDs (a, b) and CdSe QDs without curcumin functionalization (c). SAD pattern for CR-CdSe QDs (d), (inset) higher magnified image, and (e) respective EDS spectra. 0.1 M phosphate buffer solution (pH 7.02) at the scan rate of 50 mVs-1. Figure 4 shows the CV curve for all three electrodes, was (a) corresponding to the unmodified PIGE electrode. A straight line CV curve with minimum background current was observed for the bare electrode. For curcumin (c), and curcumin functionalized CdSe QDs modified electrode (b). A well defined redox peak corresponding to the two electron/two proton redox couple for the quinone and hydroquinone conversion of curcumin was observed. Compared with CR Research Paper IJRAR- International Journal of Research and Analytical Reviews 311 3.2. Morphological Characterization of CR-CdSe QDs and CdSe QDs To understand the morphology of the quantum dots HR-TEM measurement was carried out for the CdSe QDs materials with and without functionalizing curcumin. Figure.3 shows the (a) 50 nm scale bar TEM image of curcumin functionalized CdSe QDs where QDs are capped within the spherical shaped curcumin clusters and (b) 20 nm scale bar TEM image of CR-CdSe QDs, where particles of CdSe exist in the core and curcumin as the shell. As the CdSe QDs particles are confined inside the curcumin, exact particle like structure. The diffraction patterned shows multiple and Figure. 3(e) is the corresponding EDS spectrum peaks confirming the presence of elements such as Cd, Se, C and O for CR-CdSe QDs. 3.3.Electrochemical Characterization The cyclic voltammetric measurement for unmodified bare electrode, curcumin modified electrode and curcumin functionalized CdSe QDs modified electrodes were carried out inPDF Image | Curucmin functionalized cadmium selenide quantum dots
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