Size fractionation of graphene oxide sheets by the polar solvent-selective natural deposition method

Zhang, Wenjun; Zou, Xuefeng; Li, Huanrong; Hou, Jingju; Zhao, Jinfeng; Lan, Jianwen; Feng, Baolong; Liu, Shuting

doi:10.1039/c4ra08516g

Cited by 50 publications

(19 citation statements)

References 32 publications

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“…Unlike graphene, GO exhibits a broadband fluorescence ranging from UV, visible to near-infrared wavelengths [ 75 – 81 ], which opens up new device applications in optoelectronics and display [ 82 ]. The photoluminescence (PL) is believed to originate from electro-hole recombination in carbon clusters within carbon-oxygen matrix [ 79 ].…”

Section: Reviewmentioning

confidence: 99%

Graphene oxide liquid crystals: synthesis, phase transition, rheological property, and applications in optoelectronics and display

et al. 2015

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Graphene oxide (GO) liquid crystals (LCs) are macroscopically ordered GO flakes dispersed in water or polar organic solvents. Since the first report in 2011, GO LCs have attracted considerable attention for their basic properties and potential device applications. In this review, we summarize recent developments and present a comprehensive understanding of GO LCs via many aspects ranging from the exfoliation of GO flakes from graphite, to phases and phase transitions under various conditions, the orientational responses of GO under external magnetic and electric fields, and finally Kerr effect and display applications. The emphasis is placed on the unique and basic properties of GO and their ordered assembly. We will also discuss challenges and issues that need to be overcome in order to gain a more fundamental understanding and exploit full device potentials of GO LCs.

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Section: Reviewmentioning

confidence: 99%

Graphene oxide liquid crystals: synthesis, phase transition, rheological property, and applications in optoelectronics and display

et al. 2015

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“…Furthermore, dialysis is required to remove the residual inorganic additives in the systems of size fractionation, increasing the cost and time consumptions. Recently, Zhang et al developed a polar solvent‐selective sedimentation method for separation of GO with different sizes . However, the long standing time, complicate procedure, and the use of a large amount of organic solvent restrict its scalability.…”

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confidence: 99%

Size Fractionation of Graphene Oxide Sheets via Filtration through Track‐Etched Membranes

et al. 2015

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“…In one study, GO sheets with lateral dimensions larger than 40 µm 2 were selectively precipitated at a pH value of ≈4.0 . In another work, it was found that the dispersibility and stability of GO sheets were strongly correlated with the C‐O content of GO and that the lateral dimensions of GO sheets decreased inversely with the degree of oxidation . This finding enabled the separation of GO sheets into four groups, i.e., sheet size d > 25 µm, 15 µm < d < 25 µm, 5 µm < d < 15 µm, and d < 5 µm.…”

Section: Synthesismentioning

confidence: 97%

Liquid Crystals of Graphene Oxide: A Route Towards Solution‐Based Processing and Applications

Zhang

Seyedin

et al. 2017

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The liquid crystalline behavior of graphene oxide (GO) has enabled the design of facile and effective solution processing methods for assembling highly ordered macroscopic graphene structures, further expanding the development of novel graphene-based devices. In this progress report, first the preparation of liquid crystalline graphene oxide (LCGO) with a particular emphasis on different approaches to improve the oxidation efficiency and to control the GO sheet size is discussed. Then the use of LCGO dispersions in the solution processing of 1D, 2D and 3D architectures with highly tailored microstructures is covered. The LCGO composites are also reviewed as an important part of novel graphene-based multi-functional materials. Finally, various applications of LCGO are discussed to highlight the critical role of LCGO in expanding the applications of graphene. Based on these systematic discussions, an outlook on the future directions, challenges, and opportunities in this field is provided.The discovery of liquid crystalline (LC) GO by various research groups [9,[12][13][14] has offered opportunities for the fabrication of graphene-based macroscopic assemblies with unique micro-structural orders. Fibers, [10,[15][16][17][18] ribbons, [19] films, [20] and aerogels [11,15] made from LCGO have shown remarkable electrical and mechanical properties outperforming those obtained from disordered GO (non-LC GO) widening the already diverse application spectrum of graphene and GO. A topical search in Web of Science Core Collection using graphene oxide and liquid crystalline as search terms showed over 130 papers on the synthesis, processing and applications of LCGO in the last five years with over 2450 citations. Notably, more than 58% of these papers were published in 2015 and 2016 indicating the rapid growth of interest in LCGO. It should be noted that due to the restrictive nature of the search terms used, a large number of related works may have been omitted. Moreover, some researchers may have used LCGO without referring them in the title or keywords and these literatures may not have been accounted for using this simple survey.In this progress report, we first describe the oxidation mechanisms of the various GO synthesis approaches and how the knowledge on improving the oxidation efficiency and the control of sheet size have been utilized to obtain GO dispersions that display LC behavior. We then discuss the various solution processing methodologies that have been developed in generating various graphene-based architectures including 1D fibers, 2D papers, films and coatings, and 3D hydrogels, aerogels and foams. These areas are discussed to specifically highlight the advantages of LCGO towards the processing of neat (pure) and LCGO-based composites and their applications in many important areas including the development of novel materials for energy storage, optoelectronics and electro-optical switching, to name a few. We also discuss our opinion on the knowledge gaps and the opportunities that these gaps create to fur...

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Size fractionation of graphene oxide sheets by the polar solvent-selective natural deposition method

Abstract: A novel, simple, economic and efficient method utilizing polar solvents to prepare graphene oxide sheets of homogeneous size has been developed.

Cited by 50 publications

References 32 publications

Graphene oxide liquid crystals: synthesis, phase transition, rheological property, and applications in optoelectronics and display

Graphene oxide liquid crystals: synthesis, phase transition, rheological property, and applications in optoelectronics and display

Size Fractionation of Graphene Oxide Sheets via Filtration through Track‐Etched Membranes

Liquid Crystals of Graphene Oxide: A Route Towards Solution‐Based Processing and Applications

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