研究目的
Investigating the nitrogen (N) doping process of fluorinated graphene (FG) under the assistance of defluorination to understand the detailed reaction pathways and to achieve advanced graphene-based materials for energy and biological areas.
研究成果
The study demonstrated that fluorinated graphene (FG) possesses a higher and more effective reactivity with ammonia, enabling efficient nitrogen doping at relatively low temperatures with the assistance of defluorination. The dissociation and migration of C-F bonds facilitate the doping process by promoting the transformation of nitrogen atoms into pyridinic-N or graphitic-N in the graphene skeleton. This provides a feasible route for the synthesis of nitrogen-doped graphene materials with high doping levels.
研究不足
The study focuses on the nitrogen doping process of fluorinated graphene under the assistance of defluorination, which may not be directly applicable to other doping processes or materials. The experimental conditions and materials used may also limit the generalizability of the findings.
1：Experimental Design and Method Selection:
The study used modified in situ fourier transform infrared spectroscopy (i-FTIR) to monitor the nitrogen doping process of FG under the assistance of defluorination. Density functional theory (DFT) computations were also performed to explore the reduction and doping mechanisms.
2：Sample Selection and Data Sources:
Fluorinated graphene (FG) was prepared by direct fluorination of reduced graphene oxide (RGO) with F2/N2 mixed gas. Nitrogen doping of FG was carried out by annealing FGs in an NH3 atmosphere at various temperatures.
3：List of Experimental Equipment and Materials:
Equipment included a scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, Fourier transform infrared (FTIR) spectrometer, and a horizontal tube furnace. Materials included RGO, F2/N2 mixed gas, and ammonia gas.
4：Experimental Procedures and Operational Workflow:
FG was synthesized and then subjected to nitrogen doping at temperatures ranging from room temperature to 600 °C. The process was monitored using i-FTIR, and the products were characterized using SEM, TEM, XPS, Raman spectroscopy, and FTIR.
5：Data Analysis Methods:
The data were analyzed using DFT calculations to explore the reaction pathways and mechanisms of nitrogen doping assisted by defluorination.
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