Optical and structural characterization of zinc-functionalized niacin-derived carbon quantum dots
Abstract
We comprehensively investigate niacin-derived carbon quantum dots (CQDs) synthesized via hydrothermal treatment, comparing samples with (Zn-CQDs) and without (NCQDs) zinc functionalization. We utilized UV-Vis and fluorescence spectroscopy to characterize their optical properties, revealing enhanced and sharper π-π* transitions in Zn-CQDs and significantly higher fluorescence intensity across the visible spectrum compared to NCQDs. Fourier Transform Infrared (FTIR) spectroscopy identified crucial surface functional groups, including O−H and C=O, and specifically confirmed Zn−O bonding in the functionalized samples. These spectroscopic analyses confirm the successful formation of carbon nanostructures and the effective functionalization by zinc, which notably improves the CQDs' optical performance and colloidal stability. The findings underscore the potential of zinc functionalization to tune CQD properties for various optical applications.
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