Journal
NANOSCALE
Volume 6, Issue 13, Pages 7410-7415Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr01482k
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Funding
- National Natural Science Foundation of China [21375020, 21305017]
- Program for New Century Excellent Talents in Chinese University [NCET-10-0019]
- National Basic Research Program of China [2010CB732400]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1116]
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Six coal samples of different ranks have been used to prepare single-layer graphene quantum dots (S-GQDs). After chemical oxidation and a series of centrifugation separation, every coal could be treated into two fractions, namely, Coal(A) and Coal(B). According to the characterization results of TEM, AFM, XRD, Raman and FTIR, Coal(A) was revealed to be mainly composed of S-GQDs, which have an average height of about 0.5 nm and an average plane dimension of about 10 nm. The obtained S-GQDs showed excitation-dependent fluorescence and excellent electrochemiluminescence. Coal(B) was found to be some other carbon-based nanomaterials (CNMs), including agglomerated GQDs, graphene oxide, carbon quantum dots and agglomerated carbon nanocrystals. Generally, low-ranked coals might be more suitable for the preparation of S-GQDs. The production yield of S-GQDs from the six investigated coals decreased from 56.30% to 14.66% when the coal rank increased gradually. In contrast, high-ranked coals had high production yield of Coal(B) and might be more suitable for preparing other CNMs that were contained in Coal(B), although those CNMs were difficult to separate from each other in our experiment.
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