Preparation and characterization of graphene oxide paper. Nature

Department of Mechanical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3111, USA.
Nature (Impact Factor: 41.46). 08/2007; 448(7152):457-60. DOI: 10.1038/nature06016
Source: PubMed


Free-standing paper-like or foil-like materials are an integral part of our technological society. Their uses include protective layers, chemical filters, components of electrical batteries or supercapacitors, adhesive layers, electronic or optoelectronic components, and molecular storage. Inorganic 'paper-like' materials based on nanoscale components such as exfoliated vermiculite or mica platelets have been intensively studied and commercialized as protective coatings, high-temperature binders, dielectric barriers and gas-impermeable membranes. Carbon-based flexible graphite foils composed of stacked platelets of expanded graphite have long been used in packing and gasketing applications because of their chemical resistivity against most media, superior sealability over a wide temperature range, and impermeability to fluids. The discovery of carbon nanotubes brought about bucky paper, which displays excellent mechanical and electrical properties that make it potentially suitable for fuel cell and structural composite applications. Here we report the preparation and characterization of graphene oxide paper, a free-standing carbon-based membrane material made by flow-directed assembly of individual graphene oxide sheets. This new material outperforms many other paper-like materials in stiffness and strength. Its combination of macroscopic flexibility and stiffness is a result of a unique interlocking-tile arrangement of the nanoscale graphene oxide sheets.

Download full-text


Available from: Sonbinh Nguyen,
  • Source
    • "The GO–AgNPs composite membranes were obtained mainly according to flow-directed assembly by filtration [17]. The obtained GO–AgNPs composite supernatant was filtered through a 0.45 lm CA membrane to produce a paper-like material. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The removal of bacteria and other organisms from water is an important process, not only for water purification but also biofouling control in membrane filtration. In this study, we report an antibiofouling membrane by fabricating graphene oxide–silver nanoparticles (GO–AgNPs) composite onto cellulose acetate (CA) membrane. Microscopic analysis showed that the silver nanoparticles (AgNPs) retained its nanostructure morphology on the membrane surface. The contact angle results indicated that the hydrophilicity of the membrane was enhanced by the modification of modified GO–AgNPs. Under the continuous filtration test, the relative flux drop over GO–AgNPs composite membrane was only 46%, which was much lower than that the CA membrane (88%) after 24 h filtration. Moreover, the flux of the GO–AgNPs composite membrane is higher than both the GO membrane and silver membrane in the filtration process. The presence of GO–AgNPs composite on the membrane exhibited a strong antibacterial activity, leading to an inactivation of 86% Escherichia coli after contacting with the membrane for 2 h. This study may have great potential in developing high-performance antibiofouling membrane for membrane separation processes.
  • Source
    • "Alternatively, for Sample B, a 10-nm-thick GO layer was spin-coated as an insertion layer on the Ta/SiO 2 /Si substrate at room temperature before the deposition of the Ta 2 O 5 − x active layer. For preparation of the GO layer, a modified Hummer's method was adapted [17]. The precursor solution was first prepared by dissolving 10 g graphite powder in 450 ml sulphuric acid and stirred for 90 min below 10 °C. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The influence of a graphene oxide (GO) layer on Pt/Ta2O5 − x/Ta bipolar resistive switches, in which the GO layer is spin-coated on the Ta bottom electrode before the growth of a Ta2O5 − x switching element was examined. Experimental observations suggest that the insertion of the GO layer is crucial for adjusting the low resistance states without changing the high resistance states. Controlling GO layer thickness represents the variation of the forming voltage and on/off ratio, demonstrating enhanced memory windows. The possible nature of the enhanced switching events is described by adapting the creation of strong conductive filaments driven by a greater resistive GO layer.
    Thin Solid Films 07/2015; 587. DOI:10.1016/j.tsf.2014.11.032 · 1.76 Impact Factor
  • Source
    • "Nowadays, GO has become an attractive and one of important material from carbon family due to its unique characteristics which are being extensively explored. The presence of functional groups in GO renders strong hydrophilicity, good dispersibilty in many solvents which plays a major role in processing and derivatization (Dikin et al., 2007; Sharma et al., 2013; Wang et al., 2009). The selective, sensitive, fast and cost-effective detection of biomolecules is very important in treatment and clinical diagnosis. "

    Arabian Journal of Chemistry 07/2015; DOI:10.1016/j.arabjc.2015.07.015 · 3.73 Impact Factor
Show more