Journal
RSC ADVANCES
Volume 2, Issue 7, Pages 2717-2720Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ra20182h
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Funding
- National Science Foundation of China [50973039, 21074048]
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In this article, graphene quantum dots (GQDs) with tunable surface chemistry (increasing oxidation degree) were prepared by an efficient two-step method. The GQDs have tunable fluorescence induced by the degree of surface oxidation, fine solubility, high stability and applicable up-conversion photoluminescence (PL). The PL mechanism was investigated based on the surface structure and PL behaviors. More importantly, the GQDs have acid-base response property and can be applied as pH sensors.
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