(a) Molecular structure of (A) curcumin, and curcumin boron complexes, (b) BCMoxo, and (c) BCtCM dye molecules, and (B) energy levels of the dye molecules with respect to ZnO NPs.
The SEM image showing ZnO NPs. Left inset is the high resolution SEM image of single ZnO NPs and right inset is the XRD pattern of the ZnO NPs.
The UV-visible solution absorption spectra of (a) BCMoxo dye and its coupling with subsequent addition of ZnO NPs, (b) BCtCM dye molecules interaction with subsequent addition of ZnO NPs, (c) and (d) confirms the respective BCMoxo and BCtCM dyes coupling with ZnO NPs, and the absorption of ZnO NPs in acetonitrile solvent, and (e) presents the UV-visible delta values of BCMoxo (525 nm), BCtCM (518 nm) dyes, and ZnO NCs tail absorption (600 nm), respectively.
(a) UV-visible absorption of BCMoxo and BCtCM dyes on ZnO NPs film. (b) Water contact angle measurement of ZnO NPs film (24.73°), BCMoxo dye molecules on ZnO NPs film (24.42°), and BCtCM dye molecules on ZnO NPs film (37.19°), respectively.
PL spectra of (a) various dyes, (b) BCMoxo dye molecules coupling with subsequent addition of ZnO NPs, inset shows the noncoupling behavior of ZnO NPs and BCMoxo dye molecules, and (c) BCtCM dye molecules interaction with subsequent addition of ZnO NPs, inset shows the coupling-quenching behavior due to ZnO NPs and BCMoxo dye molecules interaction.
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