Enhancement in the fluorescence of graphene quantum dots by hydrazine hydrate reduction |
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| Affiliation: | 1. Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;3. State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials, Department of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, PR China;1. Vin?a Institute of Nuclear Sciences, University of Belgrade, Mike Alasa 12-14, 11001 Belgrade, Serbia;2. Polymer Institute Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava, Slovak Republic;3. Department of Chemical and Pharmaceutical Sciences, INSTM, Center of Excellence for Nanostructured Materials (CENMAT), University of Trieste, via L. Giorgieri 1, 34127 Trieste, Italy;4. Istituto per lo Studio dei Materiali Nanostrutturati (ISMN-CNR), via Ugo La Malfa 153, I-90146 Palermo, Italy;5. School of Electrical Engineering, University of Belgrade, Bulevar kralja Aleksandra 73, 11120 Belgrade, Serbia;1. Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST), 34141, Daejeon, Republic of Korea;2. Department of Anesthesiology, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, 77030, TX, USA;1. Department of Physics, Dr H S Gour University, Sagar (MP), India;2. School of Studies in Physics, Jiwaji University, Gwalior (M.P.), India |
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| Abstract: | A simple and effective chemical method was reported to enhance the fluorescence of graphene quantum dots (GQDs). Specifically, water-soluble GQDs, prepared by solvothermal synthesis from graphene oxide, are chemically reduced by hydrazine hydrate to produce reduced GQDs (rGQDs). The results show that the hydrazine hydrate reduction not only decreases the O/C atomic ratio of GQDs, also changes the bonding type of N atoms. Such surface/edge chemical bond change of GQDs results in that as-made rGQDs exhibit more than two times fluorescence intensity as strong as that of the pristine GQDs. |
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