Thermal stability of C-F/C-F2 bonds in fluorinated graphene detected by in-situ heating infrared spectroscopy

2021 
Thermal stability of fluorinated graphene (FG) plays an important role in its application and research, so it is necessary to conduct in-depth research on thermal stability of C-F bond in FG. Here, FG with different types and distributions of C-F/C(-F)2 bonds are synthesized, and the correlation between C-F/C(-F)2 bonds and thermal stability of these FG is monitored by in-situ heating infrared spectroscopy (in-situ FTIR). The stability of different types and distributions of C-F/C(-F)2 bonds in FG is determined and the temperatures at which these C-F/C(-F)2 bonds are eliminated have been located. In terms of C-F bonds in FG, the most stable kind is that in C(-F)2 of perfluorinated FG, followed by C-F bonds in perfluorinated FG. Thermal stability of isolated C-F bonds and C(-F)2 bonds adjacent to conjugated structure are the worst, which would be detached from FG at low temperature (≤82 °C). Furthermore, the evolution of conjugated structures in FG during thermal annealing is also affected by the types and distributions of C-F bonds.
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