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Structure characterization and functionalization of fluorescent Carbon Dots

AutorVallán, Lorenzo; Benito, Ana M. ; Urriolabeitia, Esteban P. ; Maser, Wolfgang K.
Fecha de publicación2016
CitaciónNanoteC16 (2016)
ResumenCarbon Dots (CDs), since their discovery in 2004, are receiving considerable attention in the fields of optoelectronic devices, sensors and biological labelling. CDs are small carbon nanoparticles below the size of 10 nm that show a very strong photoluminescence emission.Compared to the semiconductor nanocrystals, which have raised serious health and environmental concerns, CDs present a safe, green and cheaper alternative, especially regarding the biomedical application. In fact CDs show good biocompatibility and an adequate functionalization of the surface enables the cellular uptake, opening the door to their use in optical imaging techniques and, with a further step, as drug carriers for therapeutic applications. The preparation of biocompatible nanoprobes can be achieved modifying the chemical groups present on the CDs surface. For this reason the comprehension of the CDs¿ chemical structure turns out to be of great importance in order to plan a well-designed synthetic strategy. CDs can be synthetized starting from several oxygen-rich carbon sources, such us polysaccharides (top-down approach) or organic molecules (bottom-up approach). Among many different synthetic methods4, pyrolysis, hydrothermal treatment and microwave irradiation offer an easy and suitable procedure to obtain CDs. In the current work nitrogen-doped CDs are synthetized in a one-pot microwave assisted reaction, from a water solution of citric acid and ethylendiamine. The as-prepared highly fluorescent CDs were characterized employing several powerful techniques for the structure determination, such as H1NMR, C13NMR, IR, XPS and Elemental Analysis. Further functionalization on the different available surface groups of the CDs was performed, and the products were characterized.
DescripciónResumen del póster presentado a la NanoteC16: Carbon Nanoscience and Nanotechnology Conference, celebrada en Dublín (Irlanda) del 31 de agosto al 3 de septiembre de 2016.
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