Controlled local orientation of 2D nanomaterials in 3D devices: methods and prospects for multifunctional designs and enhanced performance

He, Hongying; Guan, Li-Zhi; Ferrand, Hortense Le

doi:10.1039/d2ta01926d

Cited by 12 publications

(21 citation statements)

References 321 publications

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“…Processing conditions can dramatically influence the obtained hierarchical structure. Several processes have been reported, such as suspension casting, doctor blading, vacuum-assisted self-assembly, melt compounding, in situ polymerization, etc. , About a decade ago, bioinspired polymer nanocomposites saw much advance with water-based and large-scale methodologies, akin to paper-making. ,,, Since then, the focus has shifted to the optimization of polymeric core–shell particles, followed by solvent removal. ,, The ideal conditions to realize aligned assemblies have been extensively adjusted. Nevertheless, these often are formed by intercalated structures, with restacking still observed at higher filler concentrations. ,− Above all, these efforts have led to a great number of mechanisms being proposed for polymer-particle association and (re)organization.…”

Section: Introductionmentioning

confidence: 99%

Systematic Study of the Nanostructures of Exfoliated Polymer Nanocomposites

Espíndola,

Zlopasa,

Picken

2023

Macromolecules

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High-performance bioinspired materials have shown rapid development over the last decade. Examples are brick-and-mortar hierarchical structures, which are often achieved via solvent evaporation. Although good properties are claimed, most systems are composed of stacked or intercalated platelets. Exfoliation is a crucial step to give ultimate anisotropic properties, e.g., thermal, mechanical, and barrier properties. We propose a general framework for all the various types of micro-scale structures that should be distinguished for 2D filler nanocomposites. In particular, the exfoliated state is systematically explored by the immobilization of montmorillonite platelets via (gelatin) hydrogelation. Scattering techniques were used to evaluate this strategy at the level of the particle dispersion and the regularity of spatial arrangement. The gelatin/montmorillonite exfoliated nanostructures are fully controlled by the filler volume fraction since the observed gallery d-spacings perfectly fall onto the predicted values. Surprisingly, X-ray analysis also revealed short-and quasi long-range arrangement of the montmorillonite clay at high loading.

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Section: Introductionmentioning

confidence: 99%

Systematic Study of the Nanostructures of Exfoliated Polymer Nanocomposites

Espíndola,

Zlopasa,

Picken

2023

Macromolecules

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“…[16][17][18] In addition, the preferential arrangement of the crystallites on the filler surface obtained by the templating effect greatly improves the microstructure orientation. [19][20][21][22] This templating effect is referred to as the pseudoepitaxial crystal growth, and the microstructural region composed of the templated crystals is known as the interphase. [5,23] Hence, the both electrical and mechanical performances of carbon films from polymeric nanocomposites are dominantly determined by the extent and microstructural alignment of the interphase.…”

Section: Introductionmentioning

confidence: 99%

Achieving Both Ultrahigh Electrical Conductivity and Mechanical Modulus of Carbon Films: Templating‐Coalescing Behavior of Single‐Walled Carbon Nanotube in Polyacrylonitrile

et al. 2023

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Promoting the feasibility of carbon films as electrode applications requires sufficient performances in view of both electrical and mechanical properties. Herein, carbon films with ultrahigh electrical conductivity and mechanical modulus are prepared by high temperature carbonization of polyacrylonitrile (PAN)/single-walled carbon nanotube (SWNT) nanocomposites. Achieving both performances is ascribed to remarkable graphitic crystallinity, resulting from the sequential templating-coalescing behavior of concentrated SWNT bundles (B-CNTs). While well-dispersed SWNTs (WD-CNTs) facilitate radial templating according to their tubular geometry, flattened B-CNTs sandwiched between carbonized PAN matrices induce vertical templating, where the former and latter produce concentric and planar crystallizations of the graphitic structure, respectively. After carbonization at 2500 °C with the remaining WD-CNTs as microstructural defects, the flattened B-CNTs coalesce into graphitic crystals by zipping the surrounding matrix, resulting in high crystallinity with the crystal thicknesses of 27.4 and 39.4 nm for the (002) and (10) planes, respectively. For comparison, the graphene oxide (GO) containing carbon films produce a less-ordered graphitic phase owing to irregular templating, despite the geometrical consistency. Consequently, PAN/B-CNT carbon films exhibit exceptional electrical conductivity (40.7 × 10 4 S m −1 ) and mechanical modulus (38.2 ± 6.4 GPa). Thus, controlling the templating−coalescing behavior of SWNTs is the key for improving final performances of carbon films.

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“…Several mimetic and bioinspired materials have been constructed either from suspension/melt mixing (top-down) or in-situ techniques (bottom-up). [2][3][4] The design of hierarchically structured composites from 2D nanoparticles has already been extended to clay silicates, (reduced) graphene oxide, boron nitride, MXenes, dichalcogenides, among others. [5][6][7][8] In general, the anisotropic materials show desired thermal, mechanical, conductive, and barrier properties.…”

mentioning

confidence: 99%

“…Several processes have been reported, such as suspension casting, doctor blading, vacuumassisted self-assembly, melt compounding, in-situ polymerization, etc. 2,11 About a decade ago, bioinspired polymer nanocomposites saw much advance with water-based and largescale methodologies, akin to paper-making. 9,10,12,13 Since then, the focus has shifted to the optimization of polymeric core-shell particles, followed by solvent removal.…”

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confidence: 99%

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Systematic study of the nanostructures of exfoliated polymer nanocomposites

Espíndola

Zlopaša

Picken

2023

Preprint

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High-performance bioinspired materials have shown rapid development over the last decade. Examples are brick-and-mortar hierarchical structures, which are often achieved via solvent evaporation. Although good properties are claimed, most systems are composed of stacked or intercalated platelets. Exfoliation is a crucial step to give ultimate anisotropic properties, e.g. thermal, mechanical and barrier properties. We propose a general framework for all the various types of micro-scale structures that should be distinguished for 2D-filler nanocomposites. In particular, the exfoliated state is systematically explored by the immobilization of montmorillonite platelets via (gelatin) hydrogelation. Scattering techniques were used to evaluate this strategy at the level of the particle dispersion and the regularity of spatial arrangement. The gelatin/montmorillonite exfoliated nanostructures are fully controlled by the filler volume fraction since the observed gallery d-spacings perfectly fall onto the predicted values. Surprisingly, X-ray analysis also revealed short- and quasi long-range arrangement of the MMT at high loading.

show abstract

Controlled local orientation of 2D nanomaterials in 3D devices: methods and prospects for multifunctional designs and enhanced performance

Abstract: Two-dimensional (2D) nanomaterials are sheet-like crystalline solids exhibiting remarkable electrical, chemical, mechanical and optical properties. The emergence of 2D nanomaterials of diverse chemistries with unique performance at the nanometric scale...

Cited by 12 publications

References 321 publications

Systematic Study of the Nanostructures of Exfoliated Polymer Nanocomposites

Systematic Study of the Nanostructures of Exfoliated Polymer Nanocomposites

Achieving Both Ultrahigh Electrical Conductivity and Mechanical Modulus of Carbon Films: Templating‐Coalescing Behavior of Single‐Walled Carbon Nanotube in Polyacrylonitrile

Systematic study of the nanostructures of exfoliated polymer nanocomposites

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