1. Novel Synthesis of Slightly Fluorinated Graphene Quantum Dots with Luminescent and Paramagnetic Properties through Thermal Cutting of Fluorinated Graphene.
- Author
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Feng, Qian, Xiao, Wenqing, Liu, Yuan, Zheng, Yongping, Lin, Yuda, Li, Jiaxin, Ye, Qingying, and Huang, Zhigao
- Subjects
GRAPHITE fluorides ,QUANTUM dots ,PHOTOLUMINESCENCE ,PARAMAGNETIC materials ,ADATOMS - Abstract
A novel approach has been developed to synthesize slightly fluorinated graphene quantum dots (GQDs-F) through thermal cutting of highly fluorinated graphene. The fluorinated graphene with substantial structure defects is fragile and is readily attacked. The direct evaporation of abundant CF
n (n = 2, 3) groups near structure defects lead to the loss of adjacent skelton C atoms, and the fluorinated graphene can be thermally cut into GQDs-F with a relatively uniform nanosize in pyrolysis at 810 K. The GQDs-F with a low F/C atomic ratio of ca. 0.03 exhibit excitation wavelength-dependent properties with multicolor photoluminescence (PL) from blue to green. At the same time, F adatoms that are most likely located at the edges of GQDs-F have a high efficiency of introducing paramagnetic centres, and GQDs-F show a strong paramagnetism because of sp3 -type defects and magnetic zigzag edges. The graphene quantum dots with such multimodal capabilities should have great applied value in material science. [ABSTRACT FROM AUTHOR]- Published
- 2018
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