Hydrothermal synthesis of PEGylated carbon quantum dots
Abstract
In this study, the hydrothermal method was used for the synthesis of carbon quantum dots, (CQDs) from pineapple (Ananas Comosus L), which were functionalized with polyethylene glycol (PEG), varying the mass of PEG and the pH of the solution. The nanoparticles obtained have optical properties, with absorbances within the ultraviolet range at wavelengths between 200 and 300 nm in all samples and present another absorbance signal that begins at 300 nm and extends towards the visible in the CQDs without polymer. Photostuning properties in colors from cyan to and green, at different wavelengths. In photoluminescence, the samples were excited at 440 nm, with emissions between 514 and 537 nm depending on the samples. In addition, CQDs present oxygenated organic C-O groups, which allow surface modification. On the other hand, the protonation and deprotonation of the CQDs was increased by varying the pH, analyzing its effect on the CQDs-PEG conjugation. From the absorbance data, the energy gap (Egap) was determined by determining an increase of 0.4 eV in the Egap of the particles when modifying the surface. These results show that CQDs and PEG-CQDs present efficient changes in their optical and electronic properties, making them promising candidates for innovative applications as fluorescent markers.
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References
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