Highly Ordered and Dense Thermally Conductive Graphitic Films from a Graphene Oxide/Reduced Graphene Oxide Mixture

Akbari, Abozar; Cunning, Benjamin V.; Joshi, Shalik Ram; Wang, Chunhui; Camacho-Mojica, Dulce C.; Chatterjee, Shahana; Modepalli, Vijayakumar; Cahoon, Collin; Bielawski, Christopher W.; Bakharev, Pavel V.; Kim, Gun-Ho; Ruoff, Rodney S.

doi:10.1016/j.matt.2020.02.014

Cited by 87 publications

(60 citation statements)

References 29 publications

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“…This is probably because the extra GO sheets disrupted the polymer matrices, causing the GO sheets to change from systematic orientations to random orientation, and therefore, the reduction in conductivity, a phenomenon has been observed in other studies as well. [ 67,68 ] Meanwhile, it was noticed that the brittle SAN 250 has better conductive performance compared to the rubbery counterpart at the same GO‐loading content. This may be due to the more uniform distribution of GO in the brittle polymer matrix; however, the detailed reasons should be explored in future studies.…”

Section: Resultsmentioning

confidence: 99%

Bifunctional RAFT Agent Directed Preparation of Polymer/Graphene Oxide Composites

Hsia

Wan

Fan

et al. 2021

Macromol. Rapid Commun.

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Polymer/graphene oxide (GO) composites, which combine the physical properties of GO and the processability of polymers, are of increasing interest in a variety of applications ranging from conductive foams, sensors, to bioelectronics. However, the preparation of these composites through physical blending demands the polymers with functional groups that interact strongly with the GO. Here the design and synthesis of a new bifunctional reversible addition–fragmentation chain transfer (RAFT) agent are demonstrated, which allows the synthesis of polymers with predetermined molecular weights and low dispersibilities (Ð), while having functionalities at both polymer termini that allow strong binding to GO. To access polymers with diverse thermal and mechanical properties, acrylonitrile–styrene–acrylate (ASA) copolymers with different types of acrylates, both short and long side chains, are synthesized under the control of the bifunctional RAFT agent. Furthermore, the strong binding between GO and the synthesized polymers is verified and explored to prepare polymer/GO composites with diverse tensile strengths and conductivity in the range of semiconductors. Overall, this novel RAFT agent is expected to expand the utility of polymer/GO composites by providing well‐defined polymers with tunable properties and strong binding with GO.

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Section: Resultsmentioning

confidence: 99%

Bifunctional RAFT Agent Directed Preparation of Polymer/Graphene Oxide Composites

Hsia

Wan

Fan

et al. 2021

Macromol. Rapid Commun.

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“…With the rapid development of graphene and graphene-based materials throughout the world, some new methods, new processes and new technologies [21,22,[24][25][26][27], such as molecular welding, molecular assembling, flow coating and centrifugal casting, as shown in Figures 6b and 8, have been increasingly developed to fabricate graphene-based graphite films with high thermal conductivity for thermal management application. This will surely provide some reference for the preparation strategy of PI-derived graphite films.…”

Section: New Fabrication Technologymentioning

confidence: 99%

Polyimide-Derived Graphite Films with High Thermal Conductivity

Yuan¹,

Cui²

2022

Polyimides

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Nowadays, polyimide-derived graphite films with high thermal conductivity have been increasingly applied in many cutting-edge fields needing thermal management, such as highly integrated microelectronics and wireless communication technologies. This chapter first introduces a variety of functional graphite films with high thermal conductivity of 500–2000 W/m K in the planar direction, then provides the preparation technology (including lab-scale preparation and industrial production) and quality control strategy of high-thermal-conductivity graphite films, which are derived from a special polymer- polyimide (PI) by carbonization and graphitization treatments through a suitable molding press in a vacuum furnace. The morphology, microstructure and physical properties as well as the microstructural evolution and transformation mechanism of PI films during the whole process of high-temperature treatment are comprehensively introduced. The nature of PI precursor (e.g., the molecular structure and planar molecular orientation) and preparation technics (e.g., heat-treatment temperature and molding pressure) are critical factors influencing their final physical properties. Currently challenged by the emerging of graphene-based graphite films, the latest developments and future prospects of various PI-derived carbons and composites (beyond films) with high thermal conductivity have been summarized at the end. This chapter may shed light on a promising and versatile utilization of PI-derived functional carbon materials for advanced thermal management.

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“…In addition, little attention has been paid to the alignment of graphene nanosheets or platelets when designing the interfacial interactions. Recently, some reports [11][12][13][14] have demonstrated significant enhancement in the mechanical and electrical properties of graphene films by simply decreasing the wrinkling of graphene nanosheets and thus improving their alignment. Additionally, it has been reported that some crosslinkers can not only provide strong interfacial interactions between adjacent graphene platelets but also improve the alignment of graphene platelets, resulting in remarkable mechanical and electrical properties.…”

Section: Progress and Potentialmentioning

confidence: 99%

“…Based on recent results, 5,[9][10][11][12][13][14] two consistently ignored issues need to be recognized when assembling graphene nanosheets into macroscopic graphene films. Graphene films are usually thought to be composed by alternating a one-layer graphene nanosheet and one-layer crosslinker.…”

Section: Introductionmentioning

confidence: 99%

Design Principles of High-Performance Graphene Films: Interfaces and Alignment

Wan

Jiang

Cheng

2020

Matter

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Graphene, the strongest, stiffest, and most conductive material known to date, would enable very strong, stiff, and highly conductive materials that would be better than what is available currently. These would be useful in a variety of fields, particularly flexible electronics and aerospace. Thus, to realize this potential, it is necessary to transfer these remarkable properties from graphene nanosheets into macroscopic graphene films. Nacre provides an inspiration for assembling graphene nanosheets into high-performance graphene films by constructing abundant interfacial interactions and a highly aligned structure. However, several issues in the assembly process, including intersheet bonding, dewrinkling, and alignment of graphene nanosheets, have been ignored in descriptions of previously reported macroscopic graphene films. This Review clarifies and compares the interface architecture of macroscopic graphene films described in previous reports. The representative orientation strategies are then summarized and the relationship between alignment and properties is discussed. Finally, perspectives and challenges are proposed to highlight the guidelines on how to construct high-performance graphene films in the future.

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Highly Ordered and Dense Thermally Conductive Graphitic Films from a Graphene Oxide/Reduced Graphene Oxide Mixture

Cited by 87 publications

References 29 publications

Bifunctional RAFT Agent Directed Preparation of Polymer/Graphene Oxide Composites

Bifunctional RAFT Agent Directed Preparation of Polymer/Graphene Oxide Composites

Polyimide-Derived Graphite Films with High Thermal Conductivity

Design Principles of High-Performance Graphene Films: Interfaces and Alignment

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