期刊
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
卷 30, 期 3, 页码 266-272出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ppsc.201200091
关键词
graphene oxide; fluorinated graphite; superamphiphobic materials; surface wetting; chemical exfoliation; 2D nanomaterials
资金
- NSF-Eager fund [CMMI-1153648]
- DOD: Air Force Office of Scientific Research [FA9550-12-1-0035]
- NASA [NNX10AL39H]
- DOD: ONR [N000014-09-1-1066]
- US Army Medical Research [W81XWH-10-1-0434]
- NSF [CHE0947054]
- MD Anderson Research Trust
- NASA [130626, NNX10AL39H] Funding Source: Federal RePORTER
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1153648] Funding Source: National Science Foundation
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.
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