Perylene tetracarboxylate surfactant assisted liquid phase exfoliation of graphite into graphene nanosheets with facile re-dispersibility in aqueous/organic polar solvents

Narayan, Rekha; Lim, Joonwon; Jeon, Taemin; Li, Dong Jun; Kim, Sang Ouk

doi:10.1016/j.carbon.2017.04.071

Cited by 74 publications

(48 citation statements)

References 65 publications

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“…Figure b provides a high resolution TEM (HR‐TEM) image for the sheet shown in Figure a. The respective selected area electron diffraction (SAED) pattern is shown in Figure b (inset) for the marked area (white square) on the flake evidencing a regular 6‐fold symmetry, pointing to the presence of pristine graphitic carbon structure . We also observe slight aggregation of dark particles and smaller sheets onto large ones (represented by Figure d) possibly due to smaller sheet aggregation during film formation …”

Section: Resultsmentioning

confidence: 90%

“…It is also noteworthy that continuous and vigorous vibrational motions of the individual graphene layers resulting from the sonication process creates propitious conditions to facilitate diffusion of the cNDI molecules …”

Section: Resultsmentioning

confidence: 99%

“…Samples evidenced highly transparent exfoliated graphene sheets with notable folding of larger sheets (Figure a–d). No notable defects or holes were observed indicating a high quality dispersion process . Figure b provides a high resolution TEM (HR‐TEM) image for the sheet shown in Figure a.…”

Section: Resultsmentioning

confidence: 99%

“…To further assess the quality of the cNDI exfoliated graphite materials, Raman spectroscopy was also used, as it is highly sensitive to variations in molecular structure of materials. This technique can also provide critical information such as defect level, layer number and effects of residual dopants/functionalization . Figure shows the normalized spectra with typical graphene vibrational bands: the D band (1350 cm −1 ) and G band (1600 cm −1 ), as well as 2D band (2700 cm −1 ).…”

Section: Resultsmentioning

confidence: 99%

“…Several research groups have explored the use of perylene or electron deficient naphthalene diimides (NDI) based surfactants as stabilizers to improve the dispersibility of graphene. However, these surfactants only enhanced graphene dispersibility in aqueous solutions where such dispersions are limited to preparing graphene composites in water‐soluble polymers only and are also unsuitable for applications where trace amounts of water is undesired for instance in electronic devices …”

Section: Introductionmentioning

confidence: 99%

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Molecular Design of Core Substituted Naphthalene Diimides for the Exfoliation of Graphite to Graphene in Chloroform

et al. 2019

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A significant challenge of liquid phase exfoliation (LPE) of graphite to yield graphene resides in the fact that most conventional solvents used are high boiling points and thus extremely difficult to eliminate, especially during processing of graphene into composites or films. Here, we advance the ability to produce high yield graphene in a low boiling point organic solvent, chloroform, using core‐substituted naphthalene diimides (cNDIs). Through the use of cNDIs it is possible to obtain high graphene concentrations of up to 0.13 mg/mL in chloroform. This yield represents a 69% improvement from graphene yields previously obtained in chloroform using unsubstituted NDIs. Characterisation of the products by UV‐Vis, X‐ray diffraction (XRD), Transmission electron microscopy (TEM), Raman spectroscopy and X‐ray photoelectron spectroscopy (XPS) support the use of cNDIs as an appropriate exfoliating agent in chloroform.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Molecular Design of Core Substituted Naphthalene Diimides for the Exfoliation of Graphite to Graphene in Chloroform

et al. 2019

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Corrosion Resistance and Forming Mechanism of the Lauric Acid/Graphene Composite Films on Aluminum Alloy by Electrodeposition

Liu

et al. 2021

Adv Eng Mater

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Aluminum alloys are widely used in many fields because their advantages. However, the life of aluminum alloys is largely affected by the corrosion environment. So, it is important to conduct corrosion resistance treatment on aluminum alloys. Herein, the composite film of lauric acid (LA)/graphene is prepared by electrodeposition on aluminum alloys. The morphology, structure, wettability, and chemical compositions are characterized by scanning electron microscopy (SEM), water contact angle (WCA), Fourier‐transform infrared spectroscopy (FTIR), Raman spectra, and X‐ray photoelectron spectroscopy (XPS). The electrochemical tests and the corrosion resistance of the composite film are investigated. It is found that the composite film improves the corrosion resistance of the aluminum alloys. Compared with aluminum alloys substrate, the resistance value of the composite film increases by two orders, the corrosion current density decreases by three orders, and the salt spray test time reaches 386 h. Meanwhile, the study of computational chemistry indicates that LA and graphene are adsorbed on the aluminum alloy surface by the COAl chemical bond. Finally, the film‐forming mechanism indicates that cerium ions induce LA in the process of electrodeposition, which makes LA form chemical bonds with aluminum alloys on the metal surface to form films.

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High‐Conductivity–Dispersibility Graphene Made by Catalytic Exfoliation of Graphite for Lithium‐Ion Battery

Tao

Xing

et al. 2020

Adv Funct Materials

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Despite the progress made on the production of graphene using liquid‐phase exfoliation methods, the fabrication of graphene with both high conductivity and dispersibility remains challenging. Through catalytic exfoliation of graphite, an effective synthesis method for graphene with large lateral size (≈10 µm), high conductivity (926 S cm–1), and excellent water solubility (≈10 mg mL–1) is reported herein. Such graphene can be used broadly for applications such as lithium ion batteries, where both high conductivity and dispersibility are required. As an example, the synthesis of graphene and lithium‐iron‐phosphate composites is demonstrated, which leads to electrodes with dramatically improved cycling stability and rate performance. Adaption of such material leads to electrodes with volumetric energy density as high as 658.7 and 287.6 W h L–1 under 0.5 and 20 C, respectively, which is significantly higher than that of commercial LiFePO4 (394.7 and 13.5 W h L–1 at 0.5 and 20 C, respectively). This work provides a new method of making high‐conductivity–dispersibility graphene for various applications.

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Perylene tetracarboxylate surfactant assisted liquid phase exfoliation of graphite into graphene nanosheets with facile re-dispersibility in aqueous/organic polar solvents

Cited by 74 publications

References 65 publications

Molecular Design of Core Substituted Naphthalene Diimides for the Exfoliation of Graphite to Graphene in Chloroform

Molecular Design of Core Substituted Naphthalene Diimides for the Exfoliation of Graphite to Graphene in Chloroform

Corrosion Resistance and Forming Mechanism of the Lauric Acid/Graphene Composite Films on Aluminum Alloy by Electrodeposition

High‐Conductivity–Dispersibility Graphene Made by Catalytic Exfoliation of Graphite for Lithium‐Ion Battery

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