"One-Step Synthesis of Nitrogen-Doped Carbonized Polymer Dots"

Autores: Rafaella F. Fernandes, Giordano T. Paganoto, Marcia L.A. Temperini.

Instituições: USP.

Autor apresentador: Rafaella F. Fernandes.

Resumo: The present work's primary motivation is to develop a simple and efficient experimental method for low-cost preparation of fluorescent nanomaterial from the amide-containing -glucan by using the carbonization method at low temperatures and through a less time-consuming process. The presence of large amounts of oxygenous functionality was confirmed by FTIR and Raman spectroscopies, whereas TEM illustrated the structures and the distribution of these quasi-spherical carbon dots. Thus bio-based fluorescent carbonized polymer dots were reported for the first time through a simple and effective route without using any particular apparatus or reagents.

The fluorescent carbon dots have been synthesized from various carbon precursors such as glucose, citric acid, urea, ascorbic acid, sucrose, and glycerol using some common hydrothermal approach microwave-assisted reactions. However, the need for multi-step preparations and post-treatment with surface passivating agents to improve the water solubility and luminescent properties of carbon dots can limit their applicability. Thus, the production of carbon dots from renewable and inexpensive bio-precursors by greener methods can be considered a challenging but worthy concept.

Fluorescent carbonized polymer dots are an emerging class of nanomaterials made from carbon sources hailed as potential non-toxic replacements to traditional semiconductor quantum dots. This is particularly true in live imaging and drug delivery due to their water solubility, low toxicity, and photo- and chemical stability. Carbohydrates are readily available chiral biomolecules in nature that offer an attractive and cheap starting material from which to synthesize fluorescent carbon dots with distinct features and interesting applications.

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