Direct observation of oxygen configuration on individual graphene oxide sheets

Liu, Zilong; Nørgaard, Kasper; Overgaard, Marc H.; Ceccato, Marcel; Mackenzie, David; Stenger, Nicolas; Stipp, S. L. S.; Hassenkam, Tue

doi:10.1016/j.carbon.2017.10.100

Cited by 79 publications

(58 citation statements)

References 46 publications

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“…In 2013, Dimiev et al [11] revisited the structure via acid titration and ion exchange experiment in term of acidity of GO and proposed a novel dynamical structural mode (DSM), which describes the evolution of several carbon structures with attached water beyond the static Lerf's model. More recently, Liu et al [25] experimentally observed oxygen bonding and evidenced the C=O bonds on the edge and plane of GO, confirming parts of earlier proposed models, especially the L-K model.…”

Section: Graphene Oxide Structuresupporting

confidence: 74%

Structure and synthesis of graphene oxide

Sun

2019

Chinese Journal of Chemical Engineering

122

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Graphene oxide (GO) is regarded as one typical two-dimension structured oxygenated planar molecular material. Researchers across multiple disciplines have paid enormous attention to it due to unique physiochemical properties. However, models used to describe the structure of GO are still in argument and ongoing to update. Currently, synthesis methods for massive production are seemingly abundant but in fact, dominated by few thought systems. We herein aim to give a mini but critical review over the synthesis of graphene oxide as well as its structure, involving relative peer work.

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Section: Graphene Oxide Structuresupporting

confidence: 74%

Structure and synthesis of graphene oxide

Sun

2019

Chinese Journal of Chemical Engineering

122

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“…Chemical processing of graphene via reduction of Graphene Oxide (GO) has been regarded as a scalable and an economical method for most applications [10][11][12][13][14]. However, one of the biggest challenges in chemically processed graphene/GO in the above mentioned applications is the randomness of its oxygen functionalities as well as their inhomogeneous spatial distribution [15][16][17][18][19]. Therefore, as part of controlling the process, one needs to understand the mechanism through which oxygen functionalities evolve during the process that forms GO.…”

Section: Introductionmentioning

confidence: 99%

Evolution of oxygen functionalities in graphene oxide and its impact on structure and exfoliation: An oxidation time based study

Perera

Abeywickrama

Zen

et al. 2018

Materials Chemistry and Physics

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Control over oxygen functionalities is important for the realization of Graphene Oxide (GO) based applications. Evolution of oxygen functionalities with time of oxidation and its impact on GO structure, exfoliation and reduction is investigated using XRD, FTIR, XPS, TGA and AFM. The results indicate no net increase in oxygen bound carbon atoms compared to graphitic carbon within the samples studied. However the percentage contributions from each type of oxygen functionalities tend to vary as the oxidation progress. Changes in the thermogravimetric response were observed with continued oxidation that showed a change from one mass loss region to two mass loss regions. The interaction kinetics of the protective group and the spatial distribution of oxygen functionalities during graphite oxidation give key insight to the above observed properties in GO. It is also shown that the observed changes in the structure have a direct impact on the ability to exfoliate GO to single layers as well as on the reduction process to produce reduced graphene oxide. These results are significant in the scalable production of GO with controlled and consistent quality for applications in the areas such as chemical and biological sensing, water purification and development of nanocomposite.

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“…5(c) and (d)). 39 The C-C skeleton vibration at around 1050 cm À1 and the C]C stretching vibration at around 1670 cm À1 at the middle of GO lm are stronger than those at the edge (Fig. 5(c) and (d)).…”

Section: Characterization Of Graphene Oxidementioning

confidence: 90%