Covalent Crosslinking of Graphene Quantum Dots by McMurry Deoxygenation Coupling

Graphene quantum dots were covalently crosslinked forming ensembles of a few hundred nanometers in size by McMurry deoxygenation coupling reactions of peripheral carbonyl functional moieties catalyzed by TiCl4 and Zn powders in refluxing THF, as evidenced by TEM, AFM, FTIR, Raman and XPS measurement...

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Bibliographic Details
Published in:Chemistry, an Asian journal an Asian journal, 2017-05, Vol.12 (9), p.973-977
Main Authors: Chen, Limei, Hu, Peiguang, Lu, Jia En, Chen, Shaowei
Format: Article
Language:English
Subjects:
Carbonyl powders
Chemical reactions
Chemistry
Coupling
covalent crosslinking
Crosslinking
Deoxygenation
Emission
Graphene
graphene quantum dots
McMurry deoxygenation coupling
oxygenated moiety
Photoluminescence
Quantum dots
Quinones
Refluxing
X ray photoelectron spectroscopy
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Summary:Graphene quantum dots were covalently crosslinked forming ensembles of a few hundred nanometers in size by McMurry deoxygenation coupling reactions of peripheral carbonyl functional moieties catalyzed by TiCl4 and Zn powders in refluxing THF, as evidenced by TEM, AFM, FTIR, Raman and XPS measurements. Photoluminescence measurements showed that after chemical coupling, the excitation and emission peaks blue‐shifted somewhat and the emission intensity increased markedly, likely due to the removal of oxygenated species where quinone‐like species are known to be effective electron acceptors and emission quenchers. Connecting the dots: Carbonyl moieties on graphene quantum dots (GQDs) are exploited as the active sites for covalent crosslinking of GQDs by McMurry deoxygenation coupling reactions, forming large ensembles that exhibit consistent photoluminescence properties, as revealed by microscopic and spectroscopic measurements.
ISSN:1861-4728
1861-471X
DOI:10.1002/asia.201700225