Ultrahigh electrically and thermally conductive self-aligned graphene/polymer composites using large-area reduced graphene oxides

Kumar, Pradip; Yu, Seunggun; Shahzad, Faisal; Hong, Soon Man; Kim, Yoon Hyun; Koo, Chong Min

doi:10.1016/j.carbon.2016.01.088

Cited by 220 publications

(111 citation statements)

References 47 publications

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“…In contrast, O 1S peak intensity in rGO/PVDF-HFP sample is negligible (Figure 3b), which strongly demonstrate that oxygen containing functional groups from GO sur- reduction of GO to rGO. 13,32,33 Interestingly, in both GO and rGO composite films, top side shows very high F 1S peak than bottom side, which again confirmed the asymmetric distribution of graphene in matrix and confirmed the formation of asymmetric graphene/PVDF-HFP composite film. Figure 3c show the recorded the XRD patterns of the GO and rGO composite films from both surface sides.…”

Section: Resultsmentioning

confidence: 53%

“…This uniform distribution of GO sheets in the composite is ascribed to the strong interaction between GO and PVDF-HFP polymer, which is supported by FTIR measurements. 32 Figure 2b demonstrates the cross-sectional view of as fabricated composite film. It clearly shows the aligned rGO/PVDF-HFP composite film and exhibits that graphene sheets are highly aligned throughout the matrix along film surface.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 1 illustrates the fabrication procedure for self-assembled asymmetrically conducting composite thin film by simple casting of GO/PVDF-HFP/DMF dispersion on Teflon petri dish and followed by HI reduction. 32 First, as prepared GO/PVDF-HFP/DMF dispersion was poured into a Teflon petri dish and then allowed to dry overnight at 60 • C in a conventional oven. The resulting free-standing composite film (dark brown) was completely dried under vacuum.…”

Section: Experimental Detailmentioning

confidence: 99%

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An asymmetric electrically conducting self-aligned graphene/polymer composite thin film for efficient electromagnetic interference shielding

Kumar

Cho

et al. 2017

AIP Advances

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Here, we study the self-aligned asymmetric electrically conductive composite thin film prepared via casting of graphene oxide (GO)/poly (vinylidene-hexafluoropropylene) (PVDF-HFP) dispersion, followed by low temperature hydriodic acid reduction. The results showed that composite thin film revealed the high orientation of graphene sheets along the direction of film surface. However, graphene sheets are asymmetrically distributed along the film thickness direction in the composite film. Both sides of as prepared composite film showed different surface characteristics. The asymmetric surface properties of composite film induced distinction of surface resistivity response; top surface resistivity (21 Ohm) is ∼ 4 times higher than bottom surface resistivity (5 Ohm). This asymmetric highly electrically conducting composite film revealed efficient electromagnetic interference (EMI) shielding effectiveness of ∼ 30 dB. This study could be crucial for achieving aligned asymmetric composite thin film for high-performance EMI shielding radiation.

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Section: Resultsmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Detailmentioning

confidence: 99%

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An asymmetric electrically conducting self-aligned graphene/polymer composite thin film for efficient electromagnetic interference shielding

Kumar

Cho

et al. 2017

AIP Advances

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“…Even though Henry and Chen found that the thermal conductivity (TC) of single polyethylene chains could reach 350 W m −1 K −1 , the bulk polymers are still considered to be thermal insulators as a result of structural disorder which brings about severe phonon scattering. By incorporating ceramic, metal and carbon‐based fillers, the TC of bulk polymers can be improved to some extent. Nonetheless the interfacial thermal resistance caused by poor compatibility between the polymeric matrix and inorganic fillers cannot be ignored.…”

Section: Introductionmentioning

confidence: 99%

Significant enhancement of thermal conductivity in graphite/polyester composite via interfacial π–π interaction

Tan

2020

Polymer International

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Interfacial thermal resistance between matrix and filler is one of the most serious factors hindering heat transfer in composites. Here, a type of liquid crystalline polyester (LCP) containing phenyl pendant groups was intended to blend with pristine graphite by interfacial interaction. The intensity at 26.6° of the wide angle X‐ray diffraction pattern which exceeded that of pristine graphite indicated the existence of a strong interfacial π–π interaction. Both DSC and XRD tests showed that the ordered structure of the LCP matrix is directly affected by the mass fraction of graphite, indicating the interfacial interaction between LCP and graphite. By increasing the content of graphite, the thermal diffusivity showed a sharp increment by 1004%. The maximum thermal conductivity of the composite reached 28.613 W m−1 K−1, which was seven times that of traditional thermoplastic blended with graphite. Compared with the data calculated using effective medium theory, interfacial interaction plays a significant role in enhancing the thermal conductivity of the composites. Furthermore, the maximum tensile strength of this series of composites reached 13.3 MPa and the maximum Young's modulus reached 1067 MPa, exhibiting a potential guideline for further applications in flexible electronics. © 2019 Society of Chemical Industry

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“…Therefore, graphene has a wider value and prospects for practical application compared with other members of the carbon nanomaterials family, namely zero-dimensional fullerenes and one-dimensional carbon nanotubes. In recent years, graphene has often been combined with polymer materials [7][8][9][10][11], ceramic materials [12][13][14][15][16], and metal materials [17][18][19] to prepare graphene-reinforced composites, which not only makes the physical and chemical properties of the composite materials be greatly improved [20][21][22], but also expands the application of graphene in the field of optoelectronic materials [23,24], biosensors [25,26], and catalysts [27,28]. Graphene, however, has a poor dispersion and weak interface bonding force in the matrix, which greatly limits the use of graphene as a reinforcement for composite materials.…”

Section: Introductionmentioning

confidence: 99%

Recent Developments Concerning the Dispersion Methods and Mechanisms of Graphene

et al. 2018

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Graphene, as a reinforcement for composite materials, has become a focus recently. However, the dispersion of graphene in composite materials is a problem that has been difficult to solve for a long time, which makes it difficult to produce and use graphene-reinforced composites on a large scale. Herein, methods to improve the dispersion of graphene and dispersion mechanisms that have been developed in recent years are reviewed, and the advantages and disadvantages of various methods are compared and analyzed. On this basis, the dispersion methods and mechanisms of graphene are prospected, which lays the foundation for graphene application and preparation.

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Ultrahigh electrically and thermally conductive self-aligned graphene/polymer composites using large-area reduced graphene oxides

Cited by 220 publications

References 47 publications

An asymmetric electrically conducting self-aligned graphene/polymer composite thin film for efficient electromagnetic interference shielding

An asymmetric electrically conducting self-aligned graphene/polymer composite thin film for efficient electromagnetic interference shielding

Significant enhancement of thermal conductivity in graphite/polyester composite via interfacial π–π interaction

Recent Developments Concerning the Dispersion Methods and Mechanisms of Graphene

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