A Mini-Review on Graphene: Exploration of Synthesis Methods and Multifaceted Properties

Alwan, Salam Hussein; Omran, Alaa A.; Naser, Dalya K.; Ramadan, Montather F.

doi:10.3390/engproc2023059226

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RAiSE-2023 2024

DOI: 10.3390/engproc2023059226

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A Mini-Review on Graphene: Exploration of Synthesis Methods and Multifaceted Properties

Salam Hussein Alwan,

Alaa A. Omran,

Dalya K. Naser

et al.

Abstract: This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).

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Cited by 2 publications

References 64 publications

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A novel top-down approach for high yield production of graphene from natural graphite and its supercapacitor applications

Nair,

Sreejakumari,

Venkatesan

et al. 2024

Diamond and Related Materials

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A novel top-down approach for high yield production of graphene from natural graphite and its supercapacitor applications

Nair,

Sreejakumari,

Venkatesan

et al. 2024

Diamond and Related Materials

View full text Add to dashboard Cite

Anisotropy of Electrical and Thermal Conductivity in High-Density Graphite Foils

Shulyak,

Morozov,

Gracheva

et al. 2024

Nanomaterials

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Flexible graphite foils with varying thicknesses (S = 282 ± 5 μm, M = 494 ± 7 μm, L = 746 ± 8 μm) and an initial density of 0.70 g/cm3 were obtained using the nitrate method. The specific electrical and thermal conductivity of these foils were investigated. As the density increased from 0.70 g/cm3 to 1.75 g/cm3, the specific electrical conductivity increased from 69 to 192 kS/m and the thermal conductivity increased from 109 to 326 W/(m·K) due to the rolling of graphite foils. The study showed that conductivity and anisotropy depend on the shape, orientation, and contact area of thermally expanded graphite (TEG) mesoparticles (mesostructural factor), and the crystal structure of nanocrystallites (nanostructural factor). A proposed mesostructural model explained these increases, with denser foils showing elongated, narrowed TEG particles and larger contact areas, confirmed by electron microscopy results. For graphite foils 200 and 750 μm thick, increased density led to a larger coherent scattering region, likely due to the rotation of graphite mesoparticles under mechanical action, while thinner foils (<200 μm) with densities > 1.7 g/cm3 showed increased plastic deformation, indicated by a sharp reduction in the coherent scattering region size. This was also evident from the decrease in misorientation angles with increasing density. Rolling reduced nanocrystallite misorientation angles along the rolling direction compared to the transverse direction (TD) (for 1.75 g/cm3 density ΔMA = 1.2° (S), 2.6° (M), and 2.4° (L)), explaining the observed anisotropy in the electrical and mechanical properties of the rolled graphite foils. X-ray analysis confirmed the preferred nanocrystallite orientation and anisotropy coefficients (A) using Kearns parameters, which aligned well with experimental measurements (for L series foils calculated as: A0.70 = 1.05, A1.30 = 1.10, and A1.75 = 1.16). These calculated values corresponded well with the experimental measurements of specific electrical conductivity, where the anisotropy coefficient changed from 1.00 to 1.16 and mechanical properties varied from 0.98 to 1.13.

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A Mini-Review on Graphene: Exploration of Synthesis Methods and Multifaceted Properties

Abstract: This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).

Cited by 2 publications

References 64 publications

A novel top-down approach for high yield production of graphene from natural graphite and its supercapacitor applications

A novel top-down approach for high yield production of graphene from natural graphite and its supercapacitor applications

Anisotropy of Electrical and Thermal Conductivity in High-Density Graphite Foils

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