P2O5 Assisted Green Synthesis of Multicolor Fluorescent Water Soluble Carbon Dots
| Autor: | Dipak Gorakh Babar, Sabyasachi Sarkar, Kumud Malika Tripathi, Sumit Kumar Sonkar |
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| Rok vydání: | 2014 |
| Předmět: |
Spectrophotometry
Infrared Passivation Surface Properties Kinetics Inorganic chemistry Carbohydrates Biomedical Engineering Lactose Bioengineering Nitric Oxide Spectrum Analysis Raman Photochemistry chemistry.chemical_compound symbols.namesake Microscopy Electron Transmission Nitric acid Spectrophotometry medicine General Materials Science Biomass Coloring Agents Maltose Fluorescent Dyes medicine.diagnostic_test Water Green Chemistry Technology Equipment Design General Chemistry Phosphorus Compounds Condensed Matter Physics Fluorescence Carbon Glucose Microscopy Fluorescence Carboxylation chemistry symbols Raman spectroscopy Visible spectrum |
| Zdroj: | Journal of Nanoscience and Nanotechnology. 14:2334-2342 |
| ISSN: | 1533-4880 |
| DOI: | 10.1166/jnn.2014.8487 |
| Popis: | A low cost synthesis of multicolor fluorescent carbon dots (C-dots) from edible sugars is described here. Common sugars like dextrose, lactose or maltose in aqueous medium gets dehydrated using phosphorus pentoxide (P2O5). The reaction is facile and completed within few minutes to form insoluble carbon (C-dots) mostly having the graphitic (G-band, Raman) sp2 hybridized carbon atoms (C-atoms). This insoluble carbon on oxidative treatment with nitric acid produced disordered sp3 (D-band retaining G-band, Raman) hybridized C-atoms, originated from the graphitic pool with sp2 hybridized C-atoms. This high density assimilation of self passivated "surfacial defects" become emissive during electronic transitions. Surfacial defects due to high degree of electrophilic carboxylation create the water soluble version of multicolor fluorescent C-dots as "water soluble fluorescent carbon dots" (wsFCDs). wsFCDs being itself self-passivated imposes the tunable multicolor emission throughout the visible spectrum without having any external coating and surface passivation and could be used as multicolor fluorescent probe especially in the emerging field of optical bio-imaging. |
| Databáze: | OpenAIRE |
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