Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 20, Issue 2, Pages -Publisher
SPRINGER
DOI: 10.1007/s11051-018-4123-8
Keywords
Graphene quantum dot; Electrochemiluminescence; Surface chemistry; Photoluminescence; Quantum confinement
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Funding
- National Natural Science Foundation of China [21361009, 21275003, 21465010, 21175033]
- Open Funds of the Shandong Province Key Laboratory of Detection Technology for Tumor Markers [KLDTTM2017-1]
- Doctoral Scientific Research Foundation of Hubei Minzu University [MY2015B019]
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Solvothermal synthesis was employed to tune the surface states of graphene quantum dots (GQDs). Two series of GQDs with the particle sizes from 2.6 to 4.5 nm were prepared as follows: (I) GQDs with the same size but different oxygen degrees; (II) GQDs with different core sizes but the similar surface chemistry. Both the large sizes and the high surface oxidation degrees led to the redshift photoluminescence (PL) of GQDs. Electrochemiluminescence (ECL) spectra from two series of GQDs were all in accordance with their PL spectra, respectively, which provided good evidence for the conjugated structures in GQDs responsible for PL.
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