title: Tuning of fluorine content in graphene: towards large-scale production of stoichiometric fluorographene.
abstract: The availability of well-defined modified graphene derivatives such as fluorographene, graphane, thiographene or hydroxygraphene is of pivotal importance for tuning the resulting material properties in numerous potential applications. A series of fluorinated graphene with various contents of fluorine was synthesized by a simple fluorination procedure in an autoclave with a nitrogen/fluorine atmosphere at different exposure times and temperatures. To investigate the composition, structure and properties all samples were characterized in detail by a number of analytical techniques such as SEM, XRD, EDS, AFM, STEM, combustible elemental analysis, STA, XPS, Raman spectroscopy, UV-VIS spectroscopy and cyclic voltammetry. The fully fluorinated graphene with the overall stoichiometry C1F1.05 had a bright white color indicating a significant change of band-gap. In comparison to other samples such a high concentration of fluorine led to the occurrence of exotic thermal behavior, strong luminescence in the visible spectral region and also the unique super-hydrophobic behavior observed on the material surface. The described tunable fluorination should pave the way to fluorographene based devices with tailored properties.
authors.affiliation: Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic. zdenek.sofer@vscht.cz.
authors.forename: Vlastimil
authors.initials: V
authors.lastname: Mazánek
authors.forename: Ondřej
authors.initials: O
authors.lastname: Jankovský
authors.forename: Jan
authors.initials: J
authors.lastname: Luxa
authors.forename: David
authors.initials: D
authors.lastname: Sedmidubský
authors.forename: Zbyněk
authors.initials: Z
authors.lastname: Janoušek
authors.forename: Filip
authors.initials: F
authors.lastname: Šembera
authors.forename: Martin
authors.initials: M
authors.lastname: Mikulics
authors.forename: Zdeněk
authors.initials: Z
authors.lastname: Sofer