Chemical Mass Production of Graphene Nanoplatelets in ∼100% Yield

Dimiev, Ayrat M.; Ceriotti, Gabriel; Metzger, Andrew; Kim, Nam Dong; Tour, James M.

doi:10.1021/acsnano.5b06840

Cited by 142 publications

(102 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results are similar to the data reported in other publications 31,32 and indicate that the oxidation of the prepared graphene sheets is very slight. Another peak in the binding energy range of 282.4-282.6 eV can be assigned to C-Li or C-K bonds.…”

supporting

confidence: 92%

Towards understanding the salt-intercalation exfoliation of graphite into graphene

Wang

Xiang

2017

RSC Adv.

View full text Add to dashboard Cite

The preparation of graphene from graphite is critical for both theoretical studies and real-world applications. Herein, we present a systematic study to explore the fundamental factors that control the exfoliation of graphite into graphene in a salt-intercalation exfoliation system, using various inorganic salts as intercalators. The yields of the thin graphene sheets obtained, measured via UV-vis absorption spectrophotometry, suggest that both cations and anions significantly influence the exfoliation yields. Xray photoelectron spectroscopy and energy dispersive spectroscopy analysis showed that both anions and cations become inserted into the space between conjugated graphite layers during the intercalation process. X-ray diffraction spectra revealed that the anion can enhance the salt-intercalation exfoliation by expanding the interlayer spacing. Compared to lithium chloride, both potassium chloride and lithium sulfate can significantly enhance the exfoliation yields of graphene. Optimizing the cation and anion species can improve the yield of graphene, because co-intercalation with both anions and cations occurs during the intercalation process in the solution of inorganic salts. Our work provides a guide for rationally designing the salt-intercalation exfoliation procedure to obtain higher yields of exfoliated 2D materials.

show abstract

supporting

confidence: 92%

Towards understanding the salt-intercalation exfoliation of graphite into graphene

Wang

Xiang

2017

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…112 Thus, R s of our patterns is <2Ω/□, surpassing other reported printable graphene inks. 94,113−115 Our inks also could be exploited to prepare transparent conductive films, by using grids, e . g ., a grid with line width ∼100 μm and a pitch distance ∼2000 μm would give ∼90% transparency, combined with low R s ∼ 100Ω/□ at a thickness of 10 μm.…”

Section: Results and Discussionmentioning

confidence: 99%

Microfluidization of Graphite and Formulation of Graphene-Based Conductive Inks

et al. 2017

View full text Add to dashboard Cite

We report the exfoliation of graphite in aqueous solutions under high shear rate [∼ 108 s–1] turbulent flow conditions, with a 100% exfoliation yield. The material is stabilized without centrifugation at concentrations up to 100 g/L using carboxymethylcellulose sodium salt to formulate conductive printable inks. The sheet resistance of blade coated films is below ∼2Ω/□. This is a simple and scalable production route for conductive inks for large-area printing in flexible electronics.

show abstract

“…The planar structure of the GNPs provides a 2D path for phonon transport, which provides a large surface contact area with the polymer matrix, which can increase the thermal conductivity of the composite [17]. Common techniques to produce GNPs include chemical reduction of homogeneous colloidal suspension of single layered graphene oxide [18] and by exfoliation of natural graphite flakes by oxidation reaction [19]. Some of researchers prepared GNPs from natural graphite via exfoliation and intercaltion with tetra alkyl ammonium bromide [20].…”

Section: Introductionmentioning

confidence: 99%

Melt processing and characterisation of polyamide 6/graphene nanoplatelet composites

et al. 2015

View full text Add to dashboard Cite

Composites of Linear Low Density Polyethylene (LLDPE) and Graphene Nanoplatelets (GNPs) were processed using a twin screw extruder under different extrusion conditions. The effects of screw speed, feeder speed and GNP content on the electrical, thermal and mechanical properties of composites were investigated. The inclusion of GNPs in the matrix improved the thermal stability and conductivity by 2.7% and 43%, respectively. The electrical conductivity improved from 10 -11 to 10 -5 S/m at 150 rpm due to the high thermal stability of the GNPs and the formation of phonon and charge carrier networks in the polymer matrix. Higher extruder speeds result in a better distribution of the GNPs in the matrix and a significant increase in thermal stability and thermal conductivity. However, this effect is not significant for the electrical conductivity and tensile strength. The addition of GNPs increased the viscosity of the polymer, which will lead to higher processing power requirements. Increasing the extruder speed led to a reduction in viscosity, which is due to thermal degradation and/or chain scission. Thus, while high speeds result in better dispersions, the speed needs to be optimized to prevent detrimental impacts on the properties.

show abstract

Chemical Mass Production of Graphene Nanoplatelets in ∼100% Yield

Cited by 142 publications

References 34 publications

Towards understanding the salt-intercalation exfoliation of graphite into graphene

Towards understanding the salt-intercalation exfoliation of graphite into graphene

Microfluidization of Graphite and Formulation of Graphene-Based Conductive Inks

Melt processing and characterisation of polyamide 6/graphene nanoplatelet composites

Contact Info

Product

Resources

About