Sonication-free dispersion of large-area graphene oxide sheets using internal pressure from release of intercalated carbon dioxide

Kim, Dae Woo; Kim, Dae‐Ok; Min, Byung Hyun; Lee, Huen; Jung, Hee‐Tae

doi:10.1016/j.carbon.2015.02.076

Cited by 19 publications

(18 citation statements)

References 28 publications

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“…c Cooling to −30 °C. d Immersed in water, the pressure of ejected CO 2 gas separates GO layers [ 35 ] …”

Section: Reviewmentioning

confidence: 99%

“…What is more, faster freezing rate is more efficient for exfoliation and forms high concentration GO dispersions [ 36 ]. Another sonication-free exfoliation method injects and maintains CO 2 gas in interlayer of graphite interlayers by freezing and uses the ejection pressure of CO 2 gas to disperse the graphite oxide [ 35 ]. In Fig.…”

Section: Reviewmentioning

confidence: 99%

“…As the surrounding ice melts, the pressure of ejecting gas spontaneously exfoliated and disperses the GO without sonication. The lateral size of GO exfoliated with above strategies is much larger than with sonication [ 26 , 30 , 35 , 36 ]. Besides these sonication-free methods to maintain the lateral size of GO, a multi-step sonication exfoliation was studied without reducing the size of sheets but increasing the yield in contrast to continuous sonication [ 37 ].…”

Section: Reviewmentioning

confidence: 99%

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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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“…c Cooling to −30 °C. d Immersed in water, the pressure of ejected CO 2 gas separates GO layers [ 35 ] …”

Section: Reviewmentioning

confidence: 99%

Section: Reviewmentioning

confidence: 99%

Section: Reviewmentioning

confidence: 99%

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

et al. 2015

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“…The use of intercalating surfactants to weaken the interlayer forces before exfoliation can greatly increase the yield of the exfoliation 14,16 , but the subsequent removal of the surfactant is liable to damage the quality of the exfoliated product. Other than ultrasonication, other methods have been developed for liquid phase exfoliation, including strong acid induced oxidation reactions causing cleavage 23 and freezing of water intercalated layered structures where expansion of water as it freezes causes interlayer cleavage 24 . Following on from the exfoliation, particles of specific sizes can be isolated through high speed centrifugation of the dispersion 25,26 [ Fig.…”

Section: Liquid Exfoliation Depositionmentioning

confidence: 99%

2D materials integrated in Si3N4 photonics platform

Faneca

Hogan

Alonso

et al. 2018

Silicon Photonics XIII

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In this paper, we discuss a back-end CMOS fabrication process for the large-scale integration of 2D materials on SOI (siliconon-insulator) platform and present a complete theoretical study of the change in the effective refractive index of 2D materialsenabled silicon nitride waveguide structures. The chemical vapour deposition (CVD) and liquid exfoliation fabrication methods are described for the fabrication of graphene, WS2 and MoS2 thin films. Finite-difference frequency-domain (FDFD) approach and the Transfer Matrix Method were used in order to mathematically describe these structures. The introduction of thin films of 2D material onto Si3N4 waveguide structures allows manipulation of the optical characteristics to a high degree of precision by varying the Fermi-level through the engineering of the number of atomically thin layers or by electrical tuning, for example. Based on the proposed tuning approach, designs of graphene, WS2 and MoS2 enabled Si3N4 micro-ring structures are presented for the visible and NIR range, which demonstrate versatility and desirable properties for a wide range of applications, such as bio-chemical sensing and optical communications.

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“…Other than ultrasonication, other methods have been developed for liquid phase exfoliation, including strong acid induced oxidation reactions causing cleavage 36 and freezing of water intercalated layered structures where expansion of water as it freezes causes interlayer cleavage. 37 Following exfoliation, particles of specific sizes can be isolated by centrifugation of the dispersion, 38,39 solvent induced selective sedimentation 40 or by pH-assisted selective sedimentation 41 amongst others. Materials of interest for optoelectronics and photonics that can be reduced to few-layer or monolayer by means of liquid phase exfoliation encompass a broad range; from graphene and its derivatives to transition metal dichalcogenides (TMDCs), metal oxides and hexagonal boron nitride (h-BN) amongst many others.…”

Section: D Materialsmentioning

confidence: 99%

2D Material Liquid Crystals for Optoelectronics and Photonics

Baldycheva

2018

2018 International Conference Laser Optics (ICLO)

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The merging of the materials science paradigms of liquid crystals and 2D materials promises superb new opportunities for the advancement of the fields of optoelectronics and photonics. In this review, we summarise the development of 2D material liquid crystals by two different methods: dispersion of 2D materials in a liquid crystalline host and the liquid crystal phase arising from dispersions of 2D material flakes in organic solvents. The properties of liquid crystal phases that make them attractive for optoelectronics and photonics applications are discussed. The processing of 2D materials to allow for the development of 2D material liquid crystals is also considered. An emphasis is placed on the applications of such materials; from the development of films, fibers and membranes to display applications, optoelectronic devices and quality control of synthetic processes.

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Sonication-free dispersion of large-area graphene oxide sheets using internal pressure from release of intercalated carbon dioxide

Cited by 19 publications

References 28 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

2D materials integrated in Si3N4 photonics platform

2D Material Liquid Crystals for Optoelectronics and Photonics

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