Synthesis of Fluorinated Graphene Oxide and its Amphiphobic Properties
Synthesis of Fluorinated Graphene Oxide and its Amphiphobic Properties
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DOI：
10.1002/ppsc.201200091
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发表时间：
2013-03-01
影响因子：
2.7
通讯作者：
Ajayan, P. M.
中科院分区：
文献类型：
--
作者：
Mathkar, Akshay;Narayanan, T. N.;Ajayan, P. M.
与极性有机部分键合的富含官能化的基面使得氧化石墨烯（GO）天生亲水。在此，报道了通过氧化氟化石墨的基面来合成氟化氧化石墨烯的方法，从而允许GO的可调疏水性。氟以共价键合到石墨碳上的叔烷基氟的形式存在，并且使用魔角自旋（MAS）13 C NMR作为主要工具，提出了具有显著不同氟含量的两种类型的合成的氟化氧化石墨烯（FIGH）的化学结构。CF键的低表面能极大地影响GO的润湿行为，导致其高度氟化形式的两亲性。溶液加工的简易性使得能够制造喷涂在各种多孔/无孔基材上的油墨。这些涂层对表面张力低至59 dyn/cm的溶剂保持两亲性，从而绕过现有的平版印刷方法来创建类似的表面。氟化GO和制造具有可调润湿性的石墨烯基表面的方法打开了通向独特的、可获得的碳基双疏涂层的道路。
The richly functionalized basal plane bonded to polar organic moieties makes graphene oxide (GO) innately hydrophilic. Here, a methodology to synthesize fluorinated graphene oxide by oxidizing the basal plane of fluorinated graphite, allowing for tunable hydrophobicity of GO, is reported. Fluorine exists as tertiary alkyl fluorides covalently bonded to graphitic carbons, and using magic-angle spinning (MAS) 13C NMR as a primary tool chemical structures for the two types of synthesized fluorinated graphene oxides (FGOs) with significantly different fluorine contents are proposed. The low surface energy of the CF bond drastically affects GO's wetting behavior, leading to amphiphobicity in its highly fluorinated form. Ease of solution processing enables the fabrication of inks that are spray-painted on various porous/non-porous substrates. These coatings maintain amphiphobicity for solvents with surface tensions down to 59 dyn/cm, thus bypassing existing lithographic means to create similar surfaces. The approach towards fluorinating GO and fabricating graphene-based surfaces with tunable wettability opens the path towards unique, accessible, carbon-based amphiphobic coatings.