Enhanced fluorescence properties of carbon dots in polymer films
| Autor: | Yamin Liu, Zhi Ling Hou, Gregory E. LeCroy, Ya-Ping Sun, Barbara A. Harruff-Miller, Halidan Maimaiti, K. A. Shiral Fernando, William K. Lewis, Ping Wang, Christopher E. Bunker |
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| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Vinyl alcohol Aqueous solution Materials science Analytical chemistry Nanoparticle chemistry.chemical_element 02 engineering and technology General Chemistry Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Fluorescence Article 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering Materials Chemistry Surface modification 0210 nano-technology Carbon Ethylenedioxy |
| Zdroj: | Journal of Materials Chemistry C. 4:6967-6974 |
| ISSN: | 2050-7534 2050-7526 |
| DOI: | 10.1039/c6tc01932c |
| Popis: | Carbon dots of small carbon nanoparticles surface-functionalized with 2,2′-(ethylenedioxy)bis(ethylamine) (EDA) were synthesized, and the as-synthesized sample was separated on an aqueous gel column to obtain fractions of the EDA–carbon dots with different fluorescence quantum yields. As already discussed in the literature, the variations in fluorescence performance among the fractions were attributed to the different levels and/or effectiveness of the surface functionalization–passivation in the carbon dots. These fractions, as well as carbon nanoparticles without any deliberate surface functionalization, were dispersed into poly(vinyl alcohol) (PVA) for composite films. In the PVA film matrix, the carbon dots and nanoparticles exhibited much enhanced fluorescence emissions in comparison with their corresponding aqueous solutions. The increased fluorescence quantum yields in the films were determined quantitatively by using a specifically designed and constructed film sample holder in the emission spectrometer. The observed fluorescence decays of the EDA–carbon dots in the films and in the solution were essentially the same, suggesting that the significant enhancement in fluorescence quantum yields from the solution to films is static in nature. Mechanistic implications of the results, including a rationalization in terms of the compression effect on the surface passivation layer (similar to a soft corona) in carbon dots when embedded in the more restrictive film environment resulting in more favorable radiative recombinations of the carbon particle surface-trapped electrons and holes, and also potential technological applications of the brightly fluorescent composite films are highlighted and discussed. |
| Databáze: | OpenAIRE |
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