The effective reduction of graphene oxide films using RF oxygen plasma treatment

El-Hossary, F.M.; Ghitas, Ahmed; El-Rahman, A. M. Abd; Shahat, M. Abdelhamid; Fawey, Mohammed H.

doi:10.1016/j.vacuum.2021.110158

Cited by 27 publications

(11 citation statements)

References 56 publications

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“…The Raman spectrum of the pGO sample (Figure a) depicts a slight decrease in the I D / I G ratio down to 0.65 compared to the aGO and GO samples and improvement of the crystallinity of the sample. This observation can be explained by the partial removal of defects related to oxygen functional groups with the plasma . There is no major difference in the FTIR spectrum of pGO with respect to aGO.…”

Section: Resultsmentioning

confidence: 81%

“…The GO stored in liquid form by making a GO dispersion in water also undergoes changes with time. , Therefore, effective mitigation strategies are needed to prevent aging and defects in GO-based 3D graphene materials. Recently it has been shown that plasma treatment can effectively modify the chemical structure and properties of GO materials. − However, the effects of plasma treatment have not been investigated on aged GO and 3D graphene synthesis yet.…”

Section: Introductionmentioning

confidence: 99%

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Universal Strategy for Reversing Aging and Defects in Graphene Oxide for Highly Conductive Graphene Aerogels

et al. 2023

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The production of highly stable, defect-free, and electrically conducting 3D graphene structures from graphene oxide precursors is challenging. This is because graphene oxide is a metastable material whose structure and chemistry evolve due to aging. Aging changes the relative composition of oxygen functional groups attached to the graphene oxide and negatively impacts the fabrication and properties of reduced graphene oxide. Here, we report a universal strategy to reverse the aging of graphene oxide precursors using oxygen plasma treatment. This treatment decreases the size of graphene oxide flakes and restores negative zeta potential and suspension stability in water, enabling the fabrication of compact and mechanically stable graphene aerogels using hydrothermal synthesis. Moreover, we employ high-temperature annealing to remove oxygen-containing functionalities and repair the lattice defects in reduced graphene oxide. This method allows obtaining highly electrically conducting graphene aerogels with electrical conductivity of 390 S/m and low defect density. The role of carboxyl, hydroxyl, epoxide, and ketonic oxygen species is thoroughly investigated using X-ray photoelectron and Raman spectroscopies. Our study provides unique insight into the chemical transformations occurring during the aging and thermal reduction of graphene oxide from room temperature up to 2700 °C.

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Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Universal Strategy for Reversing Aging and Defects in Graphene Oxide for Highly Conductive Graphene Aerogels

et al. 2023

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“…The response time is the time a sensor needs to reach 90% of its final potential value, in which there is contact between the sensor and ions [ 53 , 54 , 55 , 56 ]. Figure 6 a shows the relationship between the PAAM/Pt response time and the Pt coating time (3–7 min).…”

Section: Resultsmentioning

confidence: 99%

High-Performance pH Sensor Electrodes Based on a Hexagonal Pt Nanoparticle Array-Coated Nanoporous Alumina Membrane

et al. 2022

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Porous anodic alumina membranes coated with Pt nanoparticles (PAAM/Pt) have been employed as pH sensor electrodes for H+ ion detection. The PAAM was designed using a two-step anodization process. Pt nanoparticles were then sputtered onto the membrane at different deposition times. The membrane’s morphological, chemical, and optical characteristics were carefully assessed following the fabrication stage using a variety of analytical techniques. The potential of the PAAM/Pt sensor electrode was investigated by measuring the potential using a simple potentiometric method. The effects of depositing Pt nanoparticles for 3–7 min on sensor electrode sensitivity were examined. The optimal potentiometric Nernstian response slope for the PAAM/Pt sensor electrode with 5 min Pt sputter coating is 56.31 mV/decade in the pH range of 3.0 to 10 at 293 K. Additionally, the PAAM/Pt sensor electrode’s stability and selectivity in various ions solutions were examined. The sensor electrode had a lifetime of more than six weeks and was kept in a normal air environment.

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“…To overcome this problem, GO is reduced by chemical, − electrochemical, thermal, solvothermal, plasma-assisted, and photoinduced methods in the literature, which are also applicable to the electrochemically derived material due to similar chemical properties of the functional groups. Chemical reduction often relies on reactants like hydrazine, hydroiodic acid, or NaBH 4 , which are dangerous for both the environment and human health .…”

Section: Introductionmentioning

confidence: 99%

l-Ascorbic Acid Treatment of Electrochemical Graphene Nanosheets: Reduction Optimization and Application for De-Icing, Water Uptake Prevention, and Corrosion Resistance

Ostermann

Bilotto

Kadlec

et al. 2023

ACS Appl. Mater. Interfaces

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The aeronautical industry demands facile lightweight and low-cost solutions to address climate crisis challenges. Graphene can be a valid candidate to tackle these functionalities, although its upscalability remains difficult to achieve. Consequently, graphene-related materials (GRM) are gathering massive attention as top-down graphite exfoliation processes at the industrial scale are feasible and often employed. In this work, environmentally friendly produced partially oxidized graphene nanosheets (POGNs) reduced by green solvents such as l-Ascorbic Acid to rGNs are proposed to deliver functional coatings based on a glass fiber composite or coated Al2024 T3 for strategic R&D questions in the aeronautical industry, i.e., low energy production, de-icing, and water uptake. In detail, energy efficiency in rGNs production is assessed via response-surface modeling of the powder conductivity, hence proposing an optimized reduction window. De-Icing functionality is verified by measuring the stable electrothermal property of an rGNs based composite over 24 h, and water uptake is elucidated by evaluating electrochemical and corrosion properties. Moreover, a mathematical model is proposed to depict the relation between the layers’ sheet resistance and applied rGNs mass per area, which extends the system to other graphene-related materials, conductive two-dimensional materials, and various substrates. To conclude, the proposed system based on rGNs and epoxy paves the way for future multifunctional coatings, able to enhance the resistance of surfaces, such as airplane wings, in a flight harsh environment.

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The effective reduction of graphene oxide films using RF oxygen plasma treatment

Cited by 27 publications

References 56 publications

Universal Strategy for Reversing Aging and Defects in Graphene Oxide for Highly Conductive Graphene Aerogels

Universal Strategy for Reversing Aging and Defects in Graphene Oxide for Highly Conductive Graphene Aerogels

High-Performance pH Sensor Electrodes Based on a Hexagonal Pt Nanoparticle Array-Coated Nanoporous Alumina Membrane

l-Ascorbic Acid Treatment of Electrochemical Graphene Nanosheets: Reduction Optimization and Application for De-Icing, Water Uptake Prevention, and Corrosion Resistance

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