Graphene microwave absorber: Transparent, lightweight, flexible, and cost‐effective

Barbosa, Gelza M.; Mosso, Marbey M.; Vilani, Cecília; Larrudé, Dunieskys Roberto González; Romani, Eric C.; Fernando, L. F.

doi:10.1002/mop.28166

Cited by 14 publications

(7 citation statements)

References 4 publications

(9 reference statements)

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“…In particular, graphene has been seen as a potential substitute for ITO in the broader field of transparent conductors. − However, the SE of monolayer graphene is only 2.27 dB when produced by chemical vapor deposition (CVD) in the microwave range, , which is insufficient for most EMI shielding applications require SE larger than 10 dB or even larger than 20 dB at some cases. Moreover, a majority of the reported graphene-based materials for EMI shielding are opaque or offer poor transparency for high EMI SE. − Recently attempts have focused on improving the EMI shielding performance of transparent graphene-based materials to address these issues. − An example can be seen in work done by Hong et al which showed a SE of 6.91 dB at 2.2–7 GHz for triple-layer CVD graphene . Kim et al also reported a SE of 6.37 dB at 0.5–8.5 GHz with a light transmittance of 62% for reduced graphene oxide (RGO) sheets interleaved between poly(ether imide) (PEI) films fabricated by electrophoretic deposition (EPD) .…”

Section: Introductionmentioning

confidence: 99%

Transparent Conducting Graphene Hybrid Films To Improve Electromagnetic Interference (EMI) Shielding Performance of Graphene

Tan

et al. 2017

ACS Appl. Mater. Interfaces

115

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Conducting graphene-based hybrids have attracted considerable attention in recent years for their scientific and technological significance in many applications. In this work, conductive graphene hybrid films, consisting of a metallic network fully encapsulated between monolayer graphene and quartz-glass substrate, were fabricated and characterized for their electromagnetic interference shielding capabilities. Experimental results show that by integration with a metallic network the sheet resistance of graphene was significantly suppressed from 813.27 to 5.53 Ω/sq with an optical transmittance at 91%. Consequently, the microwave shielding effectiveness (SE) exceeded 23.60 dB at the K-band and 13.48 dB at the K-band. The maximum SE value was 28.91 dB at 12 GHz. Compared with the SE of pristine monolayer graphene (3.46 dB), the SE of graphene hybrid film was enhanced by 25.45 dB (99.7% energy attenuation). At 94% optical transmittance, the sheet resistance was 20.67 Ω/sq and the maximum SE value was 20.86 dB at 12 GHz. Our results show that hybrid graphene films incorporate both high conductivity and superior electromagnetic shielding comparable to existing ITO shielding modalities. The combination of high conductivity and shielding along with the materials' earth-abundant nature, and facile large-scale fabrication, make these graphene hybrid films highly attractive for transparent EMI shielding.

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Section: Introductionmentioning

confidence: 99%

Transparent Conducting Graphene Hybrid Films To Improve Electromagnetic Interference (EMI) Shielding Performance of Graphene

Tan

et al. 2017

ACS Appl. Mater. Interfaces

115

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“…The large interfacial impedance gap inevitably leads to a large reflection coefficient and thus adversely affects the performance of CVD‐grown graphene absorbers. For instance, Barbosa et al prepared CVD‐grown graphene for use as a microwave absorber by using polyurethane (PU) as a substrate . Although this device exhibited flexibility and transparent properties, its absorption loss was negligible.…”

Section: Graphene‐based Materials For Microwave Absorptionmentioning

confidence: 99%

Graphene‐Based Materials toward Microwave and Terahertz Absorbing Stealth Technologies

Chen

Huang

et al. 2019

Advanced Optical Materials

236

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Electromagnetic wave absorbing materials play an increasingly important role in consumer electronics and military defense. The remarkable merits of atomically thin graphene structures and their exotic optoelectronic properties provide new opportunities to design high‐performance electromagnetic wave absorbers. This progress report summarizes the recent advances in graphene‐based microwave and terahertz stealth materials. In the first section, the theory of electromagnetic wave absorption and the evaluation methods for absorption performance are briefly introduced. Then, representative graphene‐based microwave and terahertz absorber systems are presented with an emphasis on the selection of the absorbent component and structural design. In the last section, the perspectives and future research directions of this promising field are discussed.

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“…The sample is characterized with Raman spectrometer, optical microscope, and vectorial network analyzer. On the basis of experimental results, authors concluded that graphene can effectively replace the conventional microwave-absorbing materials due to its unique characteristics of flexibility, tunability, transparency, lightweight, costeffectiveness, and RF shielding [50].…”

Section: Dielectric Nanocompositesmentioning

confidence: 99%

Exploring the feasibility of development of nanomaterial-based microwave absorbers

Rani

Marwaha

2018

Int Nano Lett

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Advancement in the use of microwave electronics by the wireless devices, networks' server and switches, wireless antenna systems, and mobile phone base station potentially increased the radio-frequency interference. Effective elimination of this electromagnetic pollution is very necessary for proper working of electronic equipments. Microwave absorbers serve the above purpose leading to have enormous commercial and defence applications, for antenna shielding and laboratory testing of antenna. Researchers are, therefore, paying much attention on the study and fabrication of different materials and their shapes so as to use them as an absorber which ideally exhibits properties such as (1) strong absorption; (2) minimize the reflection of microwaves at air to absorber interface; (3) broader bandwidth; (4) low weight and thickness; (5) ignition at very high temperature; (6) frequency tunability; and (7) transparent and cost effective. In this paper, absorber designs based on materials and geometries proposed by number of researchers have been extensively reviewed. The preamble presented here can be explored to design novel absorbers combining material and geometry-based designs for enhanced performance to meet the future challenges.

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Graphene microwave absorber: Transparent, lightweight, flexible, and cost‐effective

Cited by 14 publications

References 4 publications

Transparent Conducting Graphene Hybrid Films To Improve Electromagnetic Interference (EMI) Shielding Performance of Graphene

Transparent Conducting Graphene Hybrid Films To Improve Electromagnetic Interference (EMI) Shielding Performance of Graphene

Graphene‐Based Materials toward Microwave and Terahertz Absorbing Stealth Technologies

Exploring the feasibility of development of nanomaterial-based microwave absorbers

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