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Journal of Materials Chemistry C Vol - 4 Issue - 19

Journal of Materials Chemistry C Vol - 4 Issue - 9

Journal of Materials Chemistry C Vol - 4 Issue - 8

Journal of Materials Chemistry C Vol - 4 Issue - 7

Journal of Materials Chemistry C Vol - 4 Issue - 6

Journal of Materials Chemistry C Vol - 4 Issue - 5

Journal of Materials Chemistry C Vol -3

Journal of Materials Chemistry C Vol -2

Journal of Materials Chemistry C Vol -1

Enhanced fluorescence properties of carbon dots in polymer films

Content Provider	Royal Society of Chemistry (RSC)
Author	Sun, Ya-Ping LeCroy, Gregory E. Liu, Yamin Fernando, K. A. Shiral Hou, Zhi-Ling Harruff-Miller, Barbara A. Lewis, William K. Wang, Ping Maimaiti, Halidan Bunker, Christopher E.
Copyright Year	2016
Abstract	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.
Starting Page	6967
Ending Page	6974
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507526
Volume Number	4
Issue Number	29
Journal	Journal of Materials Chemistry C
DOI	10.1039/c6tc01932c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	PVA Carbon black Ethylamine Electronic design automation Fluorescence Quantum tunnelling Carbon Vinyl alcohol Composite material Spectrometer Passivation (chemistry) Corona discharge
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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