Synthesis and Application of Widely Soluble Graphene Sheets

Li, Fenghua; Bao, Yu; Chai, Jia; Zhang, Qixian; Han, Dongxue; Niu, Li

doi:10.1021/la101534n

Cited by 150 publications

(115 citation statements)

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“…The broad and strong absorption band near 3450 cm -1 in the FTIR spectrum of solid state CR is associated with the stretching vibration of N-H bonds [12,[32][33][34]. The absorption near 1595 cm -1 was assigned to stretching vibration of -N=N-bond, while the bands at 1364 and 1227 cm -1 might be associated with the stretching vibrations of =C-N= group adjacent to aromatic ring.…”

Section: Resultsmentioning

confidence: 99%

“…Several low frequency absorption bands located at 832, 757, and 697 cm -1 are characteristic for aromatic rings C-H out-ofplane deformation modes [34]. In contrast to Raman scattering, FTIR spectrum clearly shows vibrations of -SO 3 group, which are located at 1178 and 1047 cm -1 [12,33,34]. Appropriate changes in the FTIR spectra of CR-GO mixtures with different quantities of CR are apparent.…”

Section: Resultsmentioning

confidence: 99%

“…So far, only a few articles have been devoted to the subject of the interaction between the azo-group and functionalized graphene sheets [12][13][14]. The interaction results in the increased solubility of carbon nanotubes, graphene sheets, reduced GO, and related carbon nanostructures.…”

Section: Introductionmentioning

confidence: 99%

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Nanocomposite films and coatings produced by interaction between graphite oxide and Congo red

et al. 2012

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Nanocomposite films and coatings were produced from the aqueous solutions containing different proportions of graphite oxide (GO) and Congo red by filtering through a polycarbonate membrane filter into alkaline media. They were examined by electron microscopy, Raman and FTIR spectroscopy, XRD, contact angle, and electrical conductivity measurements. It was established that the Congo red is able to interact through its amino groups with different functional groups of GO to form larger moieties composed of the nanoplatelets of GO. Raman spectroscopy revealed quinoid-like ring structure for dye adhering to the GO. In the case when the interaction occurs with the terminal functional groups located on the edges of the nanoplateletes of GO, larger crystallites in the nanocomposite are formed. The interaction between the Congo red and functional groups of GO situated in a basal plane leads to more compact structure of the nanocomposite. Pulsed laser treatment was used to reduce GO to graphene. Raman spectra of laser treated areas show positive effect of addition of the Congo red on the graphene yield in nanocomposite coatings after the laser treatment.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Nanocomposite films and coatings produced by interaction between graphite oxide and Congo red

et al. 2012

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“…Analysis based on Hansen solubility parameter has been applied to dispersed nanomaterials such as carbon nanotubes 33,61,62 and graphene 25,63 in recent years.…”

Section: S D Ns P S P Ns H S H Ns S Vvmentioning

confidence: 99%

Solvent Exfoliation of Transition Metal Dichalcogenides: Dispersibility of Exfoliated Nanosheets Varies Only Weakly between Compounds

et al. 2012

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Abstract:We have studied the dispersion and exfoliation of four inorganic layered compounds, WS 2 , We found that the dispersed concentration of each material falls exponentially with  as predicted by solution thermodynamics. This work shows that solution thermodynamics and specifically solubility parameter analysis can be used as a framework to understand the dispersion of 2-dimensional materials. Finally, we note that in good solvents such as 2 cyclohexylpyrrolidone, the dispersions are temporally stable with >90% of material remaining dispersed after 100 hours. ToC figOver the last decade, 2-dimensional nanomaterials have become one of the most studied subfields of nanoscience. These developments have been spearheaded by research into graphene, a material that is unique due to its combination of thermal, electronic, optical and mechanical properties. 1-5 However, over the last few years, it has become clear that a range of other inorganic layered compounds can be mechanically exfoliated in small quantities to give 2-dimensional nanosheets with interesting properties. 6-10 For example, exfoliated hexagonal boron nitride has been used as a dielectric support in graphene-based transistors 11 while MoS 2 has been fabricated into sensors 10, 12 , transistors 13-15 and integrated circuits. 16 The availability of a wide range of 2-dimensional materials is important as it allows access to a broad palette of physical and chemical properties. A good example is provided by the family of transition metal dichalcogenides (TMDs). These materials have the chemical composition MX 2 where M is a transition metal (commonly, but not limited to Ti, Nb, Ta, Mo, W) and X is a chalcogen (i.e. S, Se, Te). As in graphite, these atoms are covalently bonded into nanosheets which stack into 3-dimensional crystals by van der Waals interactions. These materials are of particular interest because, depending on the combination of metal and chalcogen, the material can be semiconducting or metallic. 17 In addition, the bandgap can vary from a few hundred meV to a few eV, 17 suggesting these materials have potential as versatile electronic device materials.Furthermore, these materials have interesting electrochemical properties which make them suitable for applications such as battery electrodes. 18,19 As with graphene, many applications will require relatively large quantities of material suggesting that a solution processing route is required. 20 A number of possibilities exist. For example, it has been known for many years that materials such as MoS 2 can be exfoliated by 3 lithium intercalation. 21 However, such a route tends to result in structural deformations in some TMDs leading to considerably altered electronic properties. 22 Alternatively, TMDs can be synthesised in the liquid phase. 7,8 Probably the simplest route to liquid exfoliation of layered compounds is sonication assisted exfoliation in solvents [23][24][25][26][27][28][29] or aqueous surfactant solutions. 19,[30][31][32] Here, sonication results in the exfoliation of the ...

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“…However, there are serious drawbacks in order to develop reliable methods for the production of processable graphene sheets in large amounts. Graphene sheets are very hydrophobic and form agglomerates easily and irreversibly in aqueous solutions in the absence of dispersing reagents as a result of π-π stacking and Van der Waals interactions [5][6].…”

Section: Introductionmentioning

confidence: 99%