Flexible Graphene Films via the Filtration of Water-Soluble Noncovalent Functionalized Graphene Sheets

Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China.
Journal of the American Chemical Society (Impact Factor: 12.11). 06/2008; 130(18):5856-7. DOI: 10.1021/ja800745y
Source: PubMed


Flexible graphene films were prepared by the filtration of water-soluble noncovalently functionalized graphene sheets with pyrenebutyrate. The work presented here will not only open a new way for preparing water-soluble graphene dispersions but also provide a general route for fabricating conducting films based on graphene.

98 Reads
  • Source
    • "The scope of this work is to propose a novel carbon-based shielding solution, combining the high electrical conductivity characterizing papers produced from worm-like EG, with the superior mechanical performance of GNP-papers obtained from exfoliated EG [31]. The developed material, which is flexible, and freestanding, is produced by vacuum filtration of homogenous colloidal suspension of MLGs, without the use of sequential alcohol and oxidative acid treatments, as described in previous work on graphene-based material for EM shielding [17] [38]. In fact, we produce MLGs through thermo-chemical exfoliation of GICs and by subsequent liquid-phase exfoliation by tip sonication of the resulting EG. "
    [Show abstract] [Hide abstract]
    ABSTRACT: A graphene-based porous paper made of multilayer graphene (MLG) microsheets is developed for application as a flexible electrically conducting shielding material at radio frequency. The production process is based on the thermal expansion of a graphite intercalated compound, the successive liquid-phase exfoliation of the resulting expanded graphite in a proper solvent, and finally the vacuum filtration of the MLG-suspension using a nanoporous alumina membrane. Enhancement of the electrical conductivity and electromagnetic shielding properties of the MLG paper is achieved by gentle annealing at 250 °C overnight, and by mechanical compression at 5 MPa. The obtained results show that the developed MLG papers are characterized by an electrical conductivity up to 1443.2 S/cm, porosity around 43%, high flexibility, shielding effectiveness up to 55 dB at 18 GHz with a thickness of 18 μm. Numerical simulations are performed in order to understand the main factors contributing to the shielding performance of the new material.
    Carbon 08/2015; 89. DOI:10.1016/j.carbon.2015.03.043 · 6.20 Impact Factor
  • Source
    • "This makes it a perfect candidate material for creating photovoltaic solar devices. In particular, graphene-based solar cells are the most reputable because of their remarkable performances as transparent electrodes [6] [7] [8], counter-electrodes [9], electron acceptors [10] [11], hole collectors,[12] and photoactive promoters [13] [14] make them promising solutions for fast-response and energy efficient applications. "
    [Show abstract] [Hide abstract]
    ABSTRACT: A solar cell based on vertically aligned silicon p–i–n, core–shell–shell, nanowires interfacing with graphene film is proposed to exploit the benefits of short carrier collection lengths of radial p–i–n junction nanowires and transparency of graphene. A physical device model incorporated with optical characteristics taking into account all recombination processes is established to optimize its electrical performance by modifying nanowires density, filling ratio and thickness. Also, the dependence of the proposed structure to temperature variations and the number of graphene layers on its performance is investigated.
    Solar Energy Materials and Solar Cells 06/2015; 137. DOI:10.1016/j.solmat.2015.01.032 · 5.34 Impact Factor
  • Source
    • "The GO was synthesized by chemical exfoliation of flake graphite through a modified Hummers' method [21] [22]. Briefly, 3 g graphite powder, 1.5 g NaNO 3 and 75 mL H 2 SO 4 were sequentially added to a three-necked round-bottomed flask placed in an ice bath under stirring. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Graphene oxide-deposited carbon fiber (GO-CF) was obtained by introducing GO onto CF surface through electrophoretic deposition method. GO-CF was found to be more effective than CF in providing electromagnetic interference shielding of cement-based composites. With 0.4 wt.% GO-CF and a shield thickness of 5 mm, a shielding effectiveness of 34 dB was attained at X-band region (8.2–12.4 GHz), which had a 31% increase than that of CF/cement (26 dB) in the same mass fraction. The GO-CF is believed a promising filler of cement-based composites for high electromagnetic interference shielding.
    Construction and Building Materials 06/2015; 84. DOI:10.1016/j.conbuildmat.2015.03.050 · 2.30 Impact Factor
Show more