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Radek Zbořil – One of the best experts on this subject based on the ideXlab platform.

  • Chemistry, properties, and applications of fluoroGraphene
    Applied Materials Today, 2017
    Co-Authors: Demetrios D. Chronopoulos, Radek Zbořil, Aristides Bakandritsos, Martin Pykal, Michal Otyepka
    Abstract:

    FluoroGraphene, formally a two-dimensional stoichiometric Graphene derivative, attracted remarkable attention of the scientific community due to its extraordinary physical and chemical properties. We overview the strategies for the preparation of fluorinated Graphene derivatives, based on top-down and bottom-up approaches. The physical and chemical properties of fluoroGraphene, which is considered as one of the thinnest insulators with a wide electronic band gap, are presented. Special attention is paid to the rapidly developing chemistry of fluoroGraphene, which was advanced in the last few years. The unusually high reactivity of fluoroGraphene, which can be chemically considered perfluorinated hydrocarbon, enables facile and scalable access to a wide portfolio of Graphene derivatives, such as Graphene acid, cyanoGraphene and allyl-Graphene. Finally, we summarize the so far reported applications of fluoroGraphene and fluorinated Graphenes, spanning from sensing and bioimaging to separation, electronics and energy technologies.

  • Halogenated Graphenes: Rapidly growing family of Graphene derivatives
    ACS Nano, 2013
    Co-Authors: František Karlický, Kasibhatta Kumara Ramanatha Datta, Michal Otyepka, Radek Zbořil
    Abstract:

    Graphene derivatives containing covalently bound halogens (Graphene halides) represent promising two-dimensional systems having interesting physical and chemical properties. The attachment of halogen atoms to sp(2) carbons changes the hybridization state to sp(3), which has a principal impact on electronic properties and local structure of the material. The fully fluorinated Graphene derivative, fluoroGraphene (Graphene fluoride, C1F1), is the thinnest insulator and the only stable stoichiometric Graphene halide (C1X1). In this review, we discuss structural properties, syntheses, chemistry, stabilities, and electronic properties of fluoroGraphene and other partially fluorinated, chlorinated, and brominated Graphenes. Remarkable optical, mechanical, vibrational, thermodynamic, and conductivity properties of Graphene halides are also explored as well as the properties of rare structures including multilayered fluorinated Graphenes, iodine-doped Graphene, and mixed Graphene halides. Finally, patterned halogenation is presented as an interesting approach for generating materials with applications in the field of Graphene-based electronic devices.

  • Graphene fluoride: A stable stoichiometric Graphene derivative and its chemical conversion to Graphene
    Small, 2010
    Co-Authors: Radek Zbořil, František Karlický, Athanasios B. Bourlinos, Theodore A. Steriotis, Athanasios K. Stubos, Vasilios Georgakilas, Klára Šafářová, Dalibor Jančík, Christos Trapalis, Michal Otyepka
    Abstract:

    Stoichoimetric Graphene fluoride monolayers are obtained in a single step by the liquid-phase exfoliation of graphite fluoride with sulfolane. Comparative quantum-mechanical calculations reveal that Graphene fluoride is the most thermodynamically stable of five studied hypothetical Graphene derivatives; graphane, Graphene fluoride, bromide, chloride, and iodide. The Graphene fluoride is transformed into Graphene via Graphene iodide, a spontaneously decomposing intermediate. The calculated bandgaps of Graphene halides vary from zero for Graphene bromide to 3.1 eV for Graphene fluoride. It is possible to design the electronic properties of such two-dimensional crystals.

Michal Otyepka – One of the best experts on this subject based on the ideXlab platform.

  • Chemistry, properties, and applications of fluoroGraphene
    Applied Materials Today, 2017
    Co-Authors: Demetrios D. Chronopoulos, Radek Zbořil, Aristides Bakandritsos, Martin Pykal, Michal Otyepka
    Abstract:

    FluoroGraphene, formally a two-dimensional stoichiometric Graphene derivative, attracted remarkable attention of the scientific community due to its extraordinary physical and chemical properties. We overview the strategies for the preparation of fluorinated Graphene derivatives, based on top-down and bottom-up approaches. The physical and chemical properties of fluoroGraphene, which is considered as one of the thinnest insulators with a wide electronic band gap, are presented. Special attention is paid to the rapidly developing chemistry of fluoroGraphene, which was advanced in the last few years. The unusually high reactivity of fluoroGraphene, which can be chemically considered perfluorinated hydrocarbon, enables facile and scalable access to a wide portfolio of Graphene derivatives, such as Graphene acid, cyanoGraphene and allyl-Graphene. Finally, we summarize the so far reported applications of fluoroGraphene and fluorinated Graphenes, spanning from sensing and bioimaging to separation, electronics and energy technologies.

  • Halogenated Graphenes: rapidly growing family of Graphene derivatives.
    ACS Nano, 2013
    Co-Authors: František Karlický, Michal Otyepka, K. K. R. Datta, Radek Zbořil
    Abstract:

    Graphene derivatives containing covalently bound halogens (Graphene halides) represent promising two-dimensional systems having interesting physical and chemical properties. The attachment of halogen atoms to sp2 carbons changes the hybridization state to sp3, which has a principal impact on electronic properties and local structure of the material. The fully fluorinated Graphene derivative, fluoroGraphene (Graphene fluoride, C1F1), is the thinnest insulator and the only stable stoichiometric Graphene halide (C1X1). In this review, we discuss structural properties, syntheses, chemistry, stabilities, and electronic properties of fluoroGraphene and other partially fluorinated, chlorinated, and brominated Graphenes. Remarkable optical, mechanical, vibrational, thermodynamic, and conductivity properties of Graphene halides are also explored as well as the properties of rare structures including multilayered fluorinated Graphenes, iodine-doped Graphene, and mixed Graphene halides. Finally, patterned halogenati…

  • Halogenated Graphenes: Rapidly growing family of Graphene derivatives
    ACS Nano, 2013
    Co-Authors: František Karlický, Kasibhatta Kumara Ramanatha Datta, Michal Otyepka, Radek Zbořil
    Abstract:

    Graphene derivatives containing covalently bound halogens (Graphene halides) represent promising two-dimensional systems having interesting physical and chemical properties. The attachment of halogen atoms to sp(2) carbons changes the hybridization state to sp(3), which has a principal impact on electronic properties and local structure of the material. The fully fluorinated Graphene derivative, fluoroGraphene (Graphene fluoride, C1F1), is the thinnest insulator and the only stable stoichiometric Graphene halide (C1X1). In this review, we discuss structural properties, syntheses, chemistry, stabilities, and electronic properties of fluoroGraphene and other partially fluorinated, chlorinated, and brominated Graphenes. Remarkable optical, mechanical, vibrational, thermodynamic, and conductivity properties of Graphene halides are also explored as well as the properties of rare structures including multilayered fluorinated Graphenes, iodine-doped Graphene, and mixed Graphene halides. Finally, patterned halogenation is presented as an interesting approach for generating materials with applications in the field of Graphene-based electronic devices.

Y Bu – One of the best experts on this subject based on the ideXlab platform.

  • highly efficient photocatalytic performance of Graphene zno quasi shell core composite material
    ACS Applied Materials & Interfaces, 2013
    Co-Authors: Y Bu, Z Chen, Weibing Li
    Abstract:

    In the present paper, the Graphene–ZnO composite with quasi-shell–core structure was successfully prepared using a one-step wet chemical method. The photocatalytic Rhodamine B degradation property and the photoelectrochemical performance of the Graphene–ZnO quasi-shell–core composite are dependent on the amount of Graphene oxide that is added. When the amount of Graphene oxide added is 10 mg, the Graphene–ZnO quasi-shell–core composite possesses the optimal photocatalytic degradation efficiency and the best photoelectrochemical performance. An efficient interfacial electric field is established on the interface between the Graphene and ZnO, which significantly improves the separation efficiency of the photogenerated electron–hole pairs and thus dramatically increases its photoelectrochemical performance. In addition to the excellent photocatalytic and photoelectrochemical properties, the electron migration ability of the grephene–ZnO quasi-shell–core composite is significantly enhanced due to the Graphene…

  • Highly efficient photocatalytic performance of Graphene-ZnO quasi-shell-core composite material
    ACS Appl Mater Interfaces, 2013
    Co-Authors: Y Bu, Z Chen, Wei Li, B. Hou
    Abstract:

    In the present paper, the Graphene-ZnO composite with quasi-shell-core structure was successfully prepared using a one-step wet chemical method. The photocatalytic Rhodamine B degradation property and the photoelectrochemical performance of the Graphene-ZnO quasi-shell-core composite are dependent on the amount of Graphene oxide that is added. When the amount of Graphene oxide added is 10 mg, the Graphene-ZnO quasi-shell-core composite possesses the optimal photocatalytic degradation efficiency and the best photoelectrochemical performance. An efficient interfacial electric field is established on the interface between the Graphene and ZnO, which significantly improves the separation efficiency of the photogenerated electron-hole pairs and thus dramatically increases its photoelectrochemical performance. In addition to the excellent photocatalytic and photoelectrochemical properties, the electron migration ability of the grephene-ZnO quasi-shell-core composite is significantly enhanced due to the Graphene coating on ZnO surface; therefore, this material has great potential for application as a substrate material to accept electrons in dye solar cell and in narrow bandgap semiconductor quantum dot sensitized solar cells.