Characteristics and microstructure of aqueous colloidal dispersions of graphite oxide

Titelman, G. I.; Gel'man, V. N.; Bron, S.; Khalfin, Rafail; Cohen, Yachin; Bianco‐Peled, Havazelet

doi:10.1016/j.carbon.2004.10.035

Cited by 597 publications

(337 citation statements)

References 17 publications

Supporting

Mentioning

315

Contrasting

Unclassified

Order By: Relevance

“…A key feature of the spectra in Figure 8A is the complete absence of peaks associated with C-OH ( ~1340 cm -1 ) and -COOH ( ~1710 to 1720 cm -1 ) groups. 4,[26][27][28] Our spectra are in contrast to those in the literature for films made from reduced graphene oxide 4,28 or chemically derived graphene 9 . This is further evidence that our exfoliation technique does not chemically functionalise the graphene/graphite and that our films are composed of largely defect free material.…”

Section: Resultscontrasting

confidence: 84%

Liquid Phase Production of Graphene by Exfoliation of Graphite in Surfactant/Water Solutions

et al. 2009

View full text Add to dashboard Cite

We have demonstrated a method to disperse and exfoliate graphite to give graphene suspended in water-surfactant solutions. Optical characterisation of these suspensions allowed the partial optimisation of the dispersion process. Transmission electron microscopy showed the dispersed phase to consist of small graphitic flakes. More than 40% of these flakes had <5 layers with ~3% of flakes consisting of monolayers. These flakes are stabilised against reaggregation by Coulomb repulsion due to the adsorbed surfactant. However, the larger flakes tend to sediment out over ~6 weeks, leaving only small flakes dispersed. It is possible to form thin films by vacuum filtration of these dispersions. Raman and IR spectroscopic analysis of these films suggests the flakes to be largely free of defects and oxides. The deposited films are reasonably conductive and are semi-transparent. Further improvements may result in the development of cheap transparent conductors.

show abstract

Section: Resultscontrasting

confidence: 84%

Liquid Phase Production of Graphene by Exfoliation of Graphite in Surfactant/Water Solutions

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Characterization of colloid microstructures revealed the presence of nano platelets, among them also stacks of graphenes and larger aggregates. [16] This dispersion approach is the key for many new applications of graphenes and manufacturing of easy to disperse functionalized graphenes. Upon chemical or thermal reduction graphite is partially recovered because carbon dioxide, carbon monoxide, and water are split off, thus removing some of the disruptive sites in the graphite sheets.…”

Section: Routes To Functionalized Graphenesmentioning

confidence: 99%

Functionalized Graphenes and Thermoplastic Nanocomposites Based upon Expanded Graphite Oxide

Steurer

Wissert

Thomann

et al. 2009

Macromol. Rapid Commun.

501

336

View full text Add to dashboard Cite

Exfoliation of expanded GO represents an attractive route to functionalized graphenes as versatile 2D carbon nanomaterials and components of a wide variety of polymer nanocomposites. Thermally reduced graphite oxides (TrGO) with specific surface areas of 600 to 950 m2 · g−1 were obtained by oxidation of graphite followed by thermal expansion at 600 °C. Thermal post treatment at 700 °C and 1 000 °C increased carbon content (81 to 97 wt.‐%) and lowered resistivity (1 600 to 50 Ω · cm). During melt extrusion with PC, iPP, SAN and PA6, exfoliation afforded uniformly dispersed graphenes with aspect ratio > 200. In comparison to conventional 0D and 1D carbon nanoparticles, TrGO afforded nanocomposites with improved stiffness and lower percolation threshold. Recent progress and new strategies in development of functionalized graphenes and graphene‐based nanocomposites are highlighted.magnified image

show abstract

“…Through reduction of graphite oxide (GO) suspended in water [15] or organic solvents [16,17], CGR can be easily obtained. Usually, there are three main routes to form GO: Brodie's method [18], Staudenmaier's method [19] and Hummers' method [20].…”

Section: Preparation Of Graphenementioning

confidence: 99%

The Prospective Two-Dimensional Graphene Nanosheets: Preparation, Functionalization and Applications

et al. 2012

View full text Add to dashboard Cite

Abstract:Graphene, as an intermediate phase between fullerene and carbon nanotube, has aroused much interests among the scientific community due to its outstanding electronic, mechanical, and thermal properties. With excellent electrical conductivity of 6000 S/cm, which is independent on chirality, graphene is a promising material for high-performance nanoelectronics, transparent conductor, as well as polymer composites. On account of its Young's Modulus of 1 TPa and ultimate strength of 130 GPa, isolated graphene sheet is considered to be among the strongest materials ever measured. Comparable with the single-walled carbon nanotube bundle, graphene has a thermal conductivity of 5000 W/(m·K), which suggests a potential application of graphene in polymer matrix for improving thermal properties of the graphene/polymer composite. Furthermore, graphene exhibits a very high surface area, up to a value of 2630 m 2 /g. All of these outstanding properties suggest a wide application for this nanometer-thick, two-dimensional carbon material. This review article presents an overview of the significant advancement in graphene research: preparation, functionalization as well as the properties of graphene will be discussed. In addition, the feasibility and potential applications of graphene in areas, such as sensors, nanoelectronics and nanocomposites materials, will also be reviewed.

show abstract

Characteristics and microstructure of aqueous colloidal dispersions of graphite oxide

Cited by 597 publications

References 17 publications

Liquid Phase Production of Graphene by Exfoliation of Graphite in Surfactant/Water Solutions

Liquid Phase Production of Graphene by Exfoliation of Graphite in Surfactant/Water Solutions

Functionalized Graphenes and Thermoplastic Nanocomposites Based upon Expanded Graphite Oxide

The Prospective Two-Dimensional Graphene Nanosheets: Preparation, Functionalization and Applications

Contact Info

Product

Resources

About