Electronic properties and atomic structure of graphene oxide membranes

Pacilé, D.; Meyer, Jannik C.; Rodríguez, A. Fraile; Papagno, M.; Gómez-Navarro, Cristina; Sundaram, Ramesh; Burghard, Marko; Kern, Klaus; Carbone, C.; Kaiser, Ute

doi:10.1016/j.carbon.2010.09.063

Cited by 232 publications

(202 citation statements)

References 30 publications

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“…The existence of "graphene capillars" suggested in refs 21,41 is not in agreement with most of recently published HRTEM studies which show that these regions do not form interconnected networks [42][43] . Only about 16% of graphene oxide area in non-oxidized regions was reported e.g.…”

Section: Discussioncontrasting

confidence: 74%

The structure of graphene oxide membranes in liquid water, ethanol and water–ethanol mixtures

et al. 2014

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The structure of graphene oxide membranes in liquid water, ethanol and water -ethanol mixtures. ABSTRACT. Structure of graphene oxide (GO) membranes was studied in situ in liquid solvents using synchrotron radiation X-ray diffraction in a broad temperature interval. GO membranes are hydrated by water similarly to precursor graphite oxide powders but intercalation of alcohols is strongly hindered, which explains why the GO membranes are permeated by water and not by ethanol. Insertion of ethanol into the membrane structure is limited to only one monolayer in the whole studied temperature range, in contrast to precursor graphite oxide powders, which are intercalated with up to two ethanol monolayers (Brodie) and four ethanol monolayers (Hummers). As a result, GO membranes demonstrate absence of "negative thermal expansion" and phase transitions connected to insertion/de-insertion of alcohols upon temperature variations reported earlier for graphite oxide powders. Therefore, GO membranes are distinct type of material with unique solvation properties compared to parent graphite oxides even if they are composed by the same graphene oxide flakes.

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Section: Discussioncontrasting

confidence: 74%

The structure of graphene oxide membranes in liquid water, ethanol and water–ethanol mixtures

et al. 2014

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“…The formation of holes in GO is due to the release of CO and CO2 during the processes of oxidation and sheet exfoliation [44]. Pacile [42] also confirmed that the structure of GO sheets consists of ordered regions along with disordered oxygen-containing functional group areas.…”

Section: Characterization Of Gomentioning

confidence: 83%

“…Therefore, the intensity ratio of the D-and G-band is related to the microstructure of GO. High-resolution transmission electron microscopy (HR-TEM) is also used to study the microstructure of GO [37,[41][42][43]. It is found that there are three major features in GO: holes, graphitic regions (graphene-like) and high contrast disordered regions, which indicate areas of high oxidation [41].…”

Section: Characterization Of Gomentioning

confidence: 99%

The Preparation of Graphene Oxide and Its Derivatives and Their Application in Bio-Tribological Systems

et al. 2014

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Graphene oxide (GO) can be readily modified for particular applications due to the existence of abundant oxygen-containing functional groups. Graphene oxide-based materials (GOBMs), which are biocompatible and hydrophilic, have wide potential applications in biomedical engineering and biotechnology. In this review, the preparation and characterization of GO and its derivatives are discussed at first. Subsequently, the biocompatibility and tribological behavior of GOBMs are reviewed. Finally, the applications of GOBMs as lubricants in bio-tribological systems are discussed in detail.

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“…In the OK region, three peaks due to O*(C=O), Q*(O-H) and Q*(C-O) were observed at 531.2, 535.8, 540.1 eV, respectively for GO. 18,19,[22][23][24] After heating, the latter peak slightly shifted to higher energy and the relative intensity of the peaks at lower energies greatly decreased. The peak at 540.1 eV is usually assigned to hydroxyl groups, however, the contribution of the other oxygen functionalities, such as carbonyl, carboxylic and epoxides is also suggested.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Intercalation of Sodium Ions into Thermally Reduced Graphite Oxide

et al. 2015

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The structure of carbon obtained from the thermal reduction of graphite oxide at 900°C after electrochemical storage sodium ions was investigated. X-ray diffraction measurement of the carbon sample after charged to various potentials indicated that sodium ions are stored between the layers of carbon below 0.3 V vs. Na/Na + though the interlayer spacing of it was similar to that of graphite. The lower LUMO energy as revealed from the broad π* peak in the region of CK observed in soft X-ray absorption measurement was responsible for the intercalation of a large amount of sodium ions into the present carbon material.

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Electronic properties and atomic structure of graphene oxide membranes

Cited by 232 publications

References 30 publications

The structure of graphene oxide membranes in liquid water, ethanol and water–ethanol mixtures

The structure of graphene oxide membranes in liquid water, ethanol and water–ethanol mixtures

The Preparation of Graphene Oxide and Its Derivatives and Their Application in Bio-Tribological Systems

Electrochemical Intercalation of Sodium Ions into Thermally Reduced Graphite Oxide

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