Size Effect of Graphene Quantum Dots on Photoluminescence |
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| Authors: | Ziyi Liu Fei Li Yi Luo Ming Li Guanghui Hu Xianjuan Pu Tao Tang Jianfeng Wen Xinyu Li Weitao Li |
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| Affiliation: | 1.College of Science, Guilin University of Technology, Guilin 541004, China; (Z.L.); (F.L.); (Y.L.); (G.H.); (T.T.); (J.W.); (X.L.);2.Shanghai Applied Radiation Institute, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China;3.Textile and Garment Industry of Research Institute, Zhongyuan University of Technology, Zhengzhou 450007, China |
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| Abstract: | High-photoluminescence (PL) graphene quantum dots (GQDs) were synthesized by a simple one-pot hydrothermal process, then separated by dialysis bags of different molecular weights. Four separated GQDs of varying sizes were obtained and displayed different PL intensities. With the decreasing size of separated GQDs, the intensity of the emission peak becomes much stronger. Finally, the GQDs of the smallest size revealed the most energetic PL intensity in four separated GQDs. The PL energy of all the separated GQDs shifted slightly, supported by density functional theory calculations. |
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| Keywords: | graphene quantum dots size effect photoluminescence |
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