Synthesis of Single-Crystalline Hexagonal Graphene Quantum Dots from Solution Chemistry

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Graphene-based carbon nanostructures with nanometer dimensions have been of great interest due to the existence of a bandgap. So-far, well-ordered edge structure and uniformly synthesized graphene quantum dots (GQDs) with a hexagonal single-crystalline structure have not been directly observed owing to the limited precision of current synthesis approaches. Herein, we report on a novel approach not just for the synthesis of the size-controlled single-crystalline GQDs with hexagonal shape but also for a new discovery on constructing 2D and 3D graphene single crystal structures from n-glucose via catalytic solution chemistry. With size-controlled single-crystalline GQDs, we elucidated the crucial role of edge states on luminescence from the correlation between their crystalline size and exciton lifetime. Furthermore, blue-emissive single-crystalline GQDs were used as an emitter on light-emitting diodes and exhibit stable deep-blue emission regardless of the voltage and doping level.
Publisher
AMER CHEMICAL SOC
Issue Date
2019-08
Language
English
Article Type
Article
Citation

NANO LETTERS, v.19, no.8, pp.5437 - 5442

ISSN
1530-6984
DOI
10.1021/acs.nanolett.9b01940
URI
http://hdl.handle.net/10203/266621
Appears in Collection
CBE-Journal Papers(저널논문)
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