High yields of graphene nanoplatelets by liquid phase exfoliation using graphene oxide as a stabilizer

Sellathurai, Andrew; Mypati, Sreemannarayana; Kontopoulou, Marianna; Barz, Dominik P. J.

doi:10.1016/j.cej.2022.138365

Cited by 33 publications

(10 citation statements)

References 56 publications

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“…23,26,27 However, the presence of surfactant molecules decreases the conductivity and surfactant removal is an arduous process. 28,29 It has been reported that the pyrene moiety has good affinity with the basal plane of graphite due to the π−π stacking interactions. 30,31 Xu et al used a water-soluble pyrene derivative, 1-pyrene butyrate, as a noncovalent stabilizer during GO reduction to prepare aqueous dispersions of rGO.…”

Section: Introductionmentioning

confidence: 99%

“…Conversely, noncovalent modification exploits polymers surfactants, , or molecules containing aromatic structures, which physically adsorb on the GNP surface via noncovalent interactions (hydrophobic, van der Waals, electrostatic, or π–π stacking) and aid in stabilizing the dispersion by preventing the GNPs from restacking. This method of functionalization also promotes molecular interaction between the GNPs and the surrounding solvent or matrix, without causing any structural changes to the GNPs. ,,,,, Some of the common surfactants used for noncovalent functionalization of GNPs include Tween-80, sodium dodecyl sulfate (SDS), ,, Triton X-100, ,, cetyltrimethylammonium bromide (CTAB), ,, and pluronic surfactants. ,, However, the presence of surfactant molecules decreases the conductivity and surfactant removal is an arduous process. , …”

Section: Introductionmentioning

confidence: 99%

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Noncovalent Functionalization of Graphene Nanoplatelets and Their Applications in Supercapacitors

Haridas,

Kader,

Sellathurai

et al. 2024

ACS Appl. Mater. Interfaces

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We demonstrate a simple noncovalent functionalization technique, which involves graphite exfoliation and subsequent coating of the resulting graphene nanoplatelets (GNPs) with trimellitic anhydride (TMA), using a thermomechanical exfoliation process. TMA adsorbs on the surface of the GNPs, resulting in a reduction of the specific surface area to 312 ± 9 m 2 /g compared to 410 ± 12 m 2 /g for the unmodified GNPs. Detailed imaging, thermogravimetric, and X-ray diffraction analysis showed that the modified GNPs (TMA-GNPs) maintain similar structure to the unmodified GNPs. The presence of functional groups, confirmed by X-ray photoelectron spectroscopy analysis, caused an increase in the surface energy from 45.6 mJ/m 2 for the GNPs to 57.9 mJ/m 2 for TMA-GNPs. The resulting coated TMA-GNPs form stable dispersions in water while maintaining their inherent conductive properties, thus enabling applications, such as the manufacture of conductive films and supercapacitors. As a proof-of-concept, electrodes for supercapacitors are prepared from concentrated aqueous dispersions of the functionalized GNPs. Electrochemical characterization of the supercapacitors using electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge/discharge tests showed a specific capacitance of 22.2 F/cm 3 at a scan rate of 1 mV/s from cyclic voltammetry and 17.3 F/cm 3 at a current density of 1 A/g from galvanostatic charge/discharge tests, with a 90% capacitance retention after 10,000 cycles.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Noncovalent Functionalization of Graphene Nanoplatelets and Their Applications in Supercapacitors

Haridas,

Kader,

Sellathurai

et al. 2024

ACS Appl. Mater. Interfaces

Self Cite

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“…[ 5–7 ] Layer‐by‐layer 2D materials are usually prepared via various approaches including micromechanical cleavage, ball milling, and liquid exfoliation in ionic liquids or organic solvents. [ 8–12 ] BPNSs, a rising star among 2D materials beyond graphene, possess unique physicochemical properties. [ 13 ] In black phosphorus (BP) crystals, the adjacent BP layers are stacked together via weak van der Waals interactions.…”

Section: Introductionmentioning

confidence: 99%

“…

or organic solvents. [8][9][10][11][12] BPNSs, a rising star among 2D materials beyond graphene, possess unique physicochemical properties. [13] In black phosphorus (BP) crystals, the adjacent BP layers are stacked together via weak van der Waals interactions.

…”

mentioning

confidence: 99%

A Spear and Shield‐Inspired Ar Plasma Safeguard Few‐Layer Black Phosphore with Firefighting of Epoxy Resin

Yuan

Liu

et al. 2023

Small

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Appearing as an innovative and efficient strategy, a facile strategy of a plasma ball mill is carried out to prepare few‐layer black phosphorus nanosheets (BPNSs), for abating the fire risk of epoxy resin (EP). A spear and shield‐inspired Ar plasma emergeed through a plasma ball mill to prevent Ar@BP nanosheets from oxidation compared with the preparation of BP nanosheets (MBPNSs) in a mechanical ball mill. The absorption coefficient in the synchrotron radiation spectrum is increased by 16.91%, indicating that BP is effectively protected by Ar proof. The Vienna ab initio simulation reveals that the combination of Ar@BP with oxygen cannot proceed spontaneously with the binding energy of 4.44 eV. With the introduction of 1.5 wt% Ar@BP, the total heat release (THR), total smoke release (TSR), total smoke production(TSP), CO, and CO2 yield, compared with that of EP, are descended by 30.40%, 24.41%, 24.10%, 33.23%, and 37.60%, respectively, indicating excellent flame retardancy property. It is attributed to the condensed and gas phase function. Meanwhile, the tensile strength and elongation at break increase by 27.92% and 56.04%, respectively, with the incorporation of 1.5 wt% Ar@BP.

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“…GO carries large numbers of oxygen-containing functional groups such as alcohols, epoxides and carboxylic acids, and thus has exceptional structure characteristics, in which numerous hydrophobic sp (2) clusters are isolated within the hydrophilic sp(3) C-O matrix [21][22][23]. Because of those unique composite properties, GO has been widely applied to every respect of social life especially in the biomedical field such as drug delivery, biosensors, antibiotics, vaccine enhancers, photo-thermal therapy and cancer treatments [24][25][26][27][28][29]. By 2020, the market for GO products is approaching $675 million, which may result in a large number of graphenebased waste [30].…”

Section: Introductionmentioning

confidence: 99%

Ameliorating Effects of Graphene Oxide on Cadmium Accumulation and Eco-Physiological Characteristics in a Greening Hyperaccumulator (Lonicera japonica Thunb.)

Liu,

Lu,

Zhao

et al. 2023

Plants

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Graphene oxide (GO), as a novel carbon-based nanomaterial (CBN), has been widely applied to every respect of social life due to its unique composite properties. The widespread use of GO inevitably promotes its interaction with heavy metal cadmium (Cd), and influences its functional behavior. However, little information is available on the effects of GO on greening hyperaccumulators under co-occurring Cd. In this study, we chose a typical greening hyperaccumulator (Lonicera japonica Thunb.) to show the effect of GO on Cd accumulation, growth, net photosynthesis rate (Pn), carbon sequestration and oxygen release functions of the plant under Cd stress. The different GO-Cd treatments were set up by (0, 10, 50 and 100 mg L−1) GO and (0, 5 and 25 mg L−1) Cd in solution culture. The maximum rate of Cd accumulation in the roots and shoots of the plant were increased by 10 mg L−1 GO (exposed to 5 mg L−1 Cd), indicating that low-concentration GO (10 mg L−1) combined with low-concentration Cd (5 mg L−1) might stimulate the absorption of Cd by L. japonica. Under GO treatments without Cd, the dry weight of root and shoot biomass, Pn value, carbon sequestration per unit leaf area and oxygen release per unit leaf area all increased in various degrees, especially under 10 mg L−1 GO, were 20.67%, 12.04%, 35% and 28.73% higher than the control. Under GO-Cd treatments, it is observed that the cooperation of low-concentration GO (10 mg L−1) and low-concentration Cd (5 mg L−1) could significantly stimulate Cd accumulation, growth, photosynthesis, carbon sequestration and oxygen release functions of the plant. These results indicated that suitable concentrations of GO could significantly alleviate the effects of Cd on L. japonica, which is helpful for expanding the phytoremediation application of greening hyperaccumulators faced with coexistence with environment of nanomaterials and heavy metals.

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High yields of graphene nanoplatelets by liquid phase exfoliation using graphene oxide as a stabilizer

Cited by 33 publications

References 56 publications

Noncovalent Functionalization of Graphene Nanoplatelets and Their Applications in Supercapacitors

Noncovalent Functionalization of Graphene Nanoplatelets and Their Applications in Supercapacitors

A Spear and Shield‐Inspired Ar Plasma Safeguard Few‐Layer Black Phosphore with Firefighting of Epoxy Resin

Ameliorating Effects of Graphene Oxide on Cadmium Accumulation and Eco-Physiological Characteristics in a Greening Hyperaccumulator (Lonicera japonica Thunb.)

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