Multi-layered graphene-Fe3O4/poly (vinylidene fluoride) hybrid composite films for high-efficient electromagnetic shielding

Guo, Zhengzheng; Ren, Penggang; Fu, Baiqiao; Ren, Fangfang; Jin, Yanling; Sun, Zhipeng

doi:10.1016/j.polymertesting.2020.106652

Cited by 43 publications

(23 citation statements)

References 58 publications

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“…The values of the composite films at 10.3 GHz were higher than the thickness value of the corresponding test samples, which indicates that the EMI performance of the film can be significantly improved by increasing the sample thickness. Remarkably, the CNF-RGO/NBR composite film had superior EMI shielding effectiveness and ultrathin thickness compared with other EMI shielding materials [22][23][24][25][26]40,[47][48][49][50][51][52][53] (Figure 6d), which indicates that the CNF-RGO/NBR composite film has good potential as an ultrathin, flexible, and highly efficient EMI shielding material.…”

Section: Resultsmentioning

confidence: 94%

“…Additionally, the SE total value of the CNF-RGO/NBR film gradually increased with the GO mass fraction, which may have resulted from the increase of the electrical conductivity of these films with the GO mass fraction. To further elucidate the mechanism of EM shielding, the comparison of the total EMI shielding effectiveness (SE total ), microwave absorption (SE A ), and microwave reflection (SE R ) at the frequency of 10.2 GHz for the obtained CNF-RGO/NBR composite films with [22][23][24][25][26]40,[47][48][49][50][51][52][53] (the hollow shape indicates that the composite material is not flexible).…”

Section: Resultsmentioning

confidence: 99%

“…Figure 6. a) Comparison of total EMI shielding effectiveness (SE total ) of composite films at the frequency of 8.2-12.4 GHz; b) comparison of total EMI shielding effectiveness (SE total ), microwave absorption (SE A ), and microwave reflection (SE R ) at 10.2 GHz for obtained EMI shielding composites with different GO mass fraction; c) proportion of reflection (R), absorption (A), and transmission (T) of CNF-RGO/NBR composite films; d) schematic of EMI shielding of CNF-RGO/NBR composite films; e) EMI shielding effectiveness of CNF-RGO/NBR-31H depending on thickness; f) EMI shielding effectiveness of resultant composite film compared with other EMI shielding materials [22][23][24][25][26]40,[47][48][49][50][51][52][53]. (the hollow shape indicates that the composite material is not flexible).…”

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confidence: 99%

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Fabrication of Cellulose Nanofiber/Reduced Graphene Oxide/Nitrile Rubber Flexible Films Using Pickering Emulsion Technology for Electromagnetic Interference Shielding and Piezoresistive Sensor

Wang

Guan

Liao

et al. 2021

Macro Materials & Eng

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With the rapid development of flexible electronics, the demand for flexible electromagnetic interference (EMI) shielding materials is increasing. This study develops a new green and effective strategy, consisting of graphene oxide (GO) and cellulose nanofibrils (CNF) co‐stabilized Pickering emulsion combined with hot‐pressing technology, to prepare flexible and conductive nitrile rubber (NBR) composite films. The composite films consist of a 3D network conductive skeleton structure of reduced GO (RGO) and an isolated NBR structure. This specific design results in a maximum high conductivity of 99 S m−1, which is higher by an order of magnitude compared with that of the composites obtained using the traditional solution blending method, and a stable EMI shielding effectiveness of 25.81 dB in the X band. The introduction of the flexible NBR results in the excellent flexibility and structural strength of the composite film, and exhibits a decrease of 2.51% in the EMI shielding efficacy after 5000 cycles. As a piezoresistive sensor for wearable devices, the CNF‐RGO/NBR flexible film can hold precise current signals and respond to finger motion. The findings of this study can provide new insights for the design of conductive and flexible composites as wearable and portable medical equipment and electronic devices.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Fabrication of Cellulose Nanofiber/Reduced Graphene Oxide/Nitrile Rubber Flexible Films Using Pickering Emulsion Technology for Electromagnetic Interference Shielding and Piezoresistive Sensor

Wang

Guan

Liao

et al. 2021

Macro Materials & Eng

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“…• Time consuming Facile synthetic route [44][45][46][47] Mostly a commonly used method to synthesize porous structures.…”

Section: Discussion Of Articlesmentioning

confidence: 99%

Preparation methods for Graphene, Metal and Polymer-based Composites for EMI Shielding Materials: State of the Art of Conventional and Machine Learning Methods

Ayub¹,

Guan²,

Ahmad³

et al. 2021

Preprint

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The electromagnetic inference is an issue from decades, where working for a better shielding material is still on-going. The purpose of this study is to review the existing methods in the formation of graphene, metal and polymer-based composites. Study indicates that in graphene and metal-based composites, the utilization of alternating deposition method showed the highest shielding effectiveness, whereas, in polymer-based composite, the utilization of chemical vapor deposition method showed highest shielding effectiveness. However, this review reveals that still there is a gap in the literature in terms of the selection of the method. Although there are various available methods which researchers adopt as per their convenience, none of the studies makes a comparison of the methods to form a similar composite. Therefore, as a future gap researcher needs to adopt various methods to form a single composite and then make a comparison of shielding effectiveness. This act will be useful for future researchers to select the appropriate method.

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“…However, strong reflections from the surfaces of materials that are highly conductive electrically, tend to yield secondary pollution, which leads to malfunction of neighboring electronic devices [26]. Thus, absorption-dominant EMI shielding materials have been developed, which include, for example, polymer-magnetic nanoparticles [27], hydrophobic-treated polymer-metallic nanoparticle [28], and polymer-graphene composites [29,30]. Additionally, several recent studies have reported that metal-coated electrospun nanofibers (NFs) work as EMI shielding materials.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Interference Shield of Highly Thermal-Conducting, Light-Weight, and Flexible Electrospun Nylon 66 Nanofiber-Silver Multi-Layer Film

et al. 2020

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A light-weight, flexible electromagnetic interference (EMI) shield was prepared by creating a layer-structured metal-polymer composite film consisting of electrospun nylon 66 nanofibers with silver films. The EMI shielding effectiveness (SE), specific SE, and absolute SE of the composite were as high as 60.6 dB, 67.9 dB cm3/g, and 6792 dB cm2/g in the X- and Ku-bands, respectively. Numerical and analytical calculations suggest that the energy of EM waves is predominantly absorbed by inter-layer multiple reflections. Because the absorbed EM energy is dissipated as heat, the thermal conductivity of absorption-dominant EMI shields is highly significant. Measured thermal conductivity of the composite was found to be 4.17 Wm−1K−1 at room temperature, which is higher than that of bulk nylon 66 by a factor of 16.7. The morphology and crystallinity of the composite were examined using scanning electron microscopy and differential scanning calorimetry, respectively. The enhancement of thermal conductivity was attributed to an increase in crystallinity of the nanofibers, which occurred during the electrospinning and subsequent hot pressing, and to the high thermal conductivity of the deposited silver films. The contribution of each fabrication process to the increase in thermal conductivity was investigated by measuring the thermal conductivity values after each fabrication process.

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Multi-layered graphene-Fe3O4/poly (vinylidene fluoride) hybrid composite films for high-efficient electromagnetic shielding

Cited by 43 publications

References 58 publications

Fabrication of Cellulose Nanofiber/Reduced Graphene Oxide/Nitrile Rubber Flexible Films Using Pickering Emulsion Technology for Electromagnetic Interference Shielding and Piezoresistive Sensor

Fabrication of Cellulose Nanofiber/Reduced Graphene Oxide/Nitrile Rubber Flexible Films Using Pickering Emulsion Technology for Electromagnetic Interference Shielding and Piezoresistive Sensor

Preparation methods for Graphene, Metal and Polymer-based Composites for EMI Shielding Materials: State of the Art of Conventional and Machine Learning Methods

Electromagnetic Interference Shield of Highly Thermal-Conducting, Light-Weight, and Flexible Electrospun Nylon 66 Nanofiber-Silver Multi-Layer Film

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