Journal
CARBON
Volume 81, Issue -, Pages 514-524Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2014.09.084
Keywords
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Funding
- International Cooperation of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)-Korean Government's Ministry of Knowledge Economy [20128510010050]
- National Research Foundation of Korea-Korean Government [2012R1A2A2A01047543]
- GRC project of KI for the NanoCentury
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We report a microwave sequential bottom-up route to produce green and blue luminescent graphene quantum dots (g-GQDs and b-GQDs) with size-tunable and switchable functionalities by tailoring the diameter size and functional groups via microwave carbonization and aromatization processes from acetylacetone as a starting organic solvent. The b-GQDs as the final product show only one emission peak at 433 nm and pH-independent blue luminescence, because two-step microwave irradiation could reduce the size and the oxygen-functional groups of the g-GQDs as an intermediate product. Also, the b-GQDs provide an exemplar enzyme-free platform for hydrogen peroxide detection through the electrochemical sensing due to much higher electron density and electron donating properties. In contrast, the g-GQDs show two different switchable photoluminescent emissions at similar to 460 nm (P1) and similar to 500 nm (P2): the P1 emission with sky-blue fluorescence originates from randomly conjugated oxygen-functional groups on the basal plane and/or edge of the g-GQDs and the P2 emission with green fluorescence results from quasi-molecular fluorophores formed by the electronic coupling of carboxylic acid groups. (C) 2014 Elsevier Ltd.All rights reserved.
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