The Polymer Tribology Group of the State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences has made a series of progress in the research and preparation of Fluorinated Graphene.
As a new derivative of graphene, fluorinated graphene not only maintains the high-strength performance of graphene, but also brings new interface and physicochemical properties such as reduced surface energy, enhanced hydrophobicity and widened band gap due to the introduction of fluorine atoms . At the same time, fluorinated graphene is resistant to high temperatures and chemically stable, showing properties similar to polytetrafluoroethylene, which is called "two-dimensional Teflon". These unique properties of fluorinated graphene have broad application prospects in the fields of interfaces, new nanoelectronic devices, and lubricating materials.
At present, the conventional method for synthesizing fluorinated graphene is to use fluorinating agents such as XeF2 to fluorinate graphene prepared by micromechanical exfoliation or chemical vapor deposition. However, the use of expensive and highly toxic fluorinated reagents greatly limits the widespread application of this method. With the support of the "Hundred Talents Program" of the Chinese Academy of Sciences, the National Natural Science Foundation of China and the Gansu Outstanding Youth Fund Project, the research team of Researcher Wang Jinqing of the State Key Laboratory of Solid Lubrication conducted a series of research work in the synthesis of fluorinated graphene, and achieved good results Research results.
The research team used commercial fluorinated graphite as raw material, and used inexpensive N-methylpyrrolidone as intercalation reagent. Through simple heat and ultrasonic treatment, it achieved the preparation of higher quality fluorinated graphene. The researchers found that ultrasound has a regulating effect on the fluorine content in fluorinated graphene. At the same time, some physicochemical properties of fluorinated graphene were systematically studied. Related research results were published in the recently published Journal of Materials Chemistry (2012, 22, 16950-16956).
At the same time, the research team also used graphene oxide and hydrogen fluoride as raw materials, and also achieved the preparation of high-quality fluorinated graphene with adjustable fluorination through hydrothermal reaction. The conductivity and band gap properties of the obtained fluorinated graphene were studied, and a possible fluorination reaction mechanism was proposed by Raman spectroscopy analysis. Related research results will be published in the recently published Carbon (DOI: 10.1016 / j.carbon.2012.07.026).
Schematic diagram of the process of preparing fluorinated graphene by peeling method
TEM, HR-TEM, EDX and SAED diagrams of the obtained fluorinated graphene
(ad) XPS full spectrum and C1s spectrum of graphene oxide, hydrothermally reduced graphene and hydrothermal fluorinated graphene; (e) XRD of graphene oxide, hydrothermally reduced graphene and hydrothermal fluorinated graphene Figure.
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