Journal
JOURNAL OF APPLIED PHYSICS
Volume 116, Issue 24, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4904958
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Funding
- National Natural Science Foundation of China [11304197, 61370042, 11474201, 61234005]
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We report a facile hydrothermal synthesis of intrinsic fluorescent graphene quantum dots (GQDs) with two-dimensional morphology. This synthesis uses glucose, concentrate sulfuric acid, and deionized water as reagents. Concentrated sulfuric acid is found to play a key role in controlling the transformation of as-prepared hydrothermal products from amorphous carbon nanodots to well-crystallized GQDs. These GQDs show typical absorption characteristic for graphene, and have nearly excitation-independent ultraviolet and blue intrinsic emissions. Temperature-dependent PL measurements have demonstrated strong electron-electron scattering and electron-phonon interactions, suggesting a similar temperature behavior of GQDs to inorganic semiconductor quantum dots. According to optical studies, the ultraviolet emission is found to originate from the recombination of electron-hole pairs localized in the C-C bonds, while the blue emission is from the electron transition of sp(2) domains. (C) 2014 AIP Publishing LLC.
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