Study of oxygen-containing groups in a series of graphite oxides: Physical and chemical characterization

Hontoria-Lucas, C.; López-Peinado, A.J.; López-González, J. de D.; Cervantes, María Luisa Rojas; Martı́n-Aranda, R.M.

doi:10.1016/0008-6223(95)00120-3

Cited by 1,013 publications

(710 citation statements)

References 28 publications

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“…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: 83%

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

et al. 2009

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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.

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Section: Resultscontrasting

confidence: 83%

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

et al. 2009

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“…[29,30] For GO, the peak at 2 Theta about 9.29 o represents the interlayer distance of 9.5 Å. [31] For MOF-5-GOn (n = 1, 2 or 3) nanocomposites, the sharpness of the peak at 2 Theta about 9.7 o is slightly reduced and the splitting of that peak is noticed. This splitting increases in its visibility with an increase in the content of GO.…”

Section: Resultsmentioning

confidence: 99%

MOF–Graphite Oxide Composites: Combining the Uniqueness of Graphene Layers and Metal–Organic Frameworks

2009

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Graphite oxide (GO) / metal-organic framework (MOF-5) nanocomposites are synthesized with various ratios of the two components. In developing the concept of these new adsorbents, it was expected that distorted graphene sheets would contribute to the enhancement in the dispersive interactions, whereas MOF-5 component would contribute to the expansion of the pore space where adsorbates could be stored. Moreover, taking into account the variety of transition and noble metals, which can be used to form the MOF structure, those materials Moreover, specific combination and synergy between GO and MOF-5 units also result in the formation of a unique porosity characteristic of the nanocomposites.3

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“…As can be seen, ozonolysis introduces a broad feature in the wave number range 1000-1300 cm −1 and a smaller peak near 950 cm −1 , both of which decay with time. Features near 1100 cm −1 are widely associated with C-O stretch and on carbon surfaces have been assigned to various C-O containing functional groups including ethers, esters, ring and ethers [30][31][32][33]. In organic compounds epoxide peaks are typically present between 830 and 890 cm −1 [34] but have been reported as high as 910 cm −1 [35] and 950 cm −1 [34].…”

Section: Resultsmentioning

confidence: 99%

High capacity mercury adsorption on freshly ozone-treated carbon surfaces

Manchester

Wang

Külaots

et al. 2008

Carbon

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A set of carbon materials was treated by a choice of common oxidizers to investigate the mercury capture capacities at varying temperature conditions. It was found that ozone treatment dramatically increases the mercury capture capacity of carbon surfaces by factors up to 134, but the activity is easily destroyed by exposure to the atmosphere, to water vapor, or by mild heating. Freshly ozonetreated carbon surfaces are shown to oxidize iodide to iodine in solution and this ability fades with aging. FTIR analysis shows broad C-O stretch features from 950 to 1300 cm −1 , which decay upon atmospheric exposure and are similar to the C-O-C asymmetric stretch features of ethylene secondary ozonide. The combined results suggest that the ultra-high mercury capture efficiency is due to a subset of labile C-O functional groups with residual oxidizing power that are likely epoxides or (epoxide-containing) secondary ozonides. The results open the possibility for in situ ozonolysis to create high-performance carbon-based Hg sorbents.

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Study of oxygen-containing groups in a series of graphite oxides: Physical and chemical characterization

Cited by 1,013 publications

References 28 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

MOF–Graphite Oxide Composites: Combining the Uniqueness of Graphene Layers and Metal–Organic Frameworks

High capacity mercury adsorption on freshly ozone-treated carbon surfaces

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