Microwave absorbing properties of a thermally reduced graphene oxide/nitrile butadiene rubber composite

Singh, Vivek Kumar; Shukla, Anuj; Patra, Manoj Kumar; Saini, Lokesh; Jani, Raj Kumar; Vadera, Sampat Raj; Kumar, Narendra

doi:10.1016/j.carbon.2012.01.033

Cited by 399 publications

(184 citation statements)

References 24 publications

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“…Through electrostatic doping, we show that atomically thin layers can be used as a switchable radar absorbing surfaces. Graphene and carbon nanotube-based composite materials have been used as resistive materials to absorb microwaves; however, to our knowledge they have not been used for active microwave surfaces [16][17][18][19][20][21][22][23][24][25][26][27] .…”

mentioning

confidence: 99%

Graphene-enabled electrically switchable radar-absorbing surfaces

et al. 2015

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Radar-absorbing materials are used in stealth technologies for concealment of an object from radar detection. Resistive and/or magnetic composite materials are used to reduce the backscattered microwave signals. Inability to control electrical properties of these materials, however, hinders the realization of active camouflage systems. Here, using large-area graphene electrodes, we demonstrate active surfaces that enable electrical control of reflection, transmission and absorption of microwaves. Instead of tuning bulk material property, our strategy relies on electrostatic tuning of the charge density on an atomically thin electrode, which operates as a tunable metal in microwave frequencies. Notably, we report large-area adaptive radar-absorbing surfaces with tunable reflection suppression ratio up to 50 dB with operation voltages o5 V. Using the developed surfaces, we demonstrate various device architectures including pixelated and curved surfaces. Our results provide a significant step in realization of active camouflage systems in microwave frequencies.

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confidence: 99%

Graphene-enabled electrically switchable radar-absorbing surfaces

et al. 2015

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“…Carbon Nano Tubes (CNTs) and graphene have already been investigated for microwave absorption applications [1][2][3][4][5] due to their great thermal stability, reluctance toward chemical agents and excellent mechanical and electrical properties. CNTs are much more attractive for the preparation of RAMs with respect to graphene and graphene oxide [6] since they have a lower cost of production and are less troublesome to disperse in host polymers. Even at low filler contents, they can improve mechanical and electrical performances of the host polymer [7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Microwave Absorbing Properties of Epoxy MWCNT Composites

Savi¹,

Miscuglio²,

Giorcelli³

et al. 2014

PIER Letters

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Abstract-In the ongoing search for new materials for microwave absorption applications, Carbon Nanotubes deserve a special consideration due to their outstanding properties. In this paper, microwave absorbing properties of epoxy resin based composites containing commercial Multi Walled Carbon Nanotubes used as fillers have been analyzed. The complex permittivity of the composites was measured in a wide frequency band (3-18 GHz). The absorbing properties of a single-layer absorber backed by a metallic plate considering several concentration of CNTs was simulated taking into account the measured permittivity.

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“…[24][25][26][27] For instance, Che and co-workers have initially demonstrated that magnetic iron was able to be encapsulated into carbon nanotubes, and thus the magnetic carbon nanotubes were able to deliver very broad microwave absorption performance. [28] Since this report, plenty of studies based on carbon-based magnetic hybrid fillers received increasing attention.…”

Section: Introductionmentioning

confidence: 99%

Broadening Electromagnetic Absorption Bandwidth: Design from Microscopic Dielectric‐Magnetic Coupled Absorbers to Macroscopic Patterns

Liu

Wang

et al. 2017

Physica Status Solidi (a)

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As electromagnetic absorption materials with broadband absorption are highly pursued in the recent development of cutting-edge electronic and telecommunication industries, the traditional uniform bulk composites with dielectric and magnetic active absorbers are attracting extensive interest, with remaining concerns of extending the effective absorption bandwidth. To understand the impact of using dielectric-magnetic coupled absorption fillers and to implement artificial absorption structures in the absorption performance, in this work, both nanoscale nonmagnetic and magnetic graphene hybrid fillers are prepared as the effective absorbers. In the comparison based on the microscopic studies, magnetic graphene fillers are found to possess dual absorption bands in the investigation region, which is responsible for extending the effective absorption bandwidth. With subsequent macroscopic structure design based on the as-fabricated composites, the artificial structures established on the composites embedded with magnetic graphene fillers exhibit more broadened absorption bandwidth because of the exclusive advantages of absorption from multiple thickness and greater interfacial impedance matching. The results suggest that combination of developing microscopic dielectric-magnetic coupled absorbers and macroscopic structure design will fundamentally extend the effective absorption bandwidth of the electromagnetic absorption materials.

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Microwave absorbing properties of a thermally reduced graphene oxide/nitrile butadiene rubber composite

Cited by 399 publications

References 24 publications

Graphene-enabled electrically switchable radar-absorbing surfaces

Graphene-enabled electrically switchable radar-absorbing surfaces

Analysis of Microwave Absorbing Properties of Epoxy MWCNT Composites

Broadening Electromagnetic Absorption Bandwidth: Design from Microscopic Dielectric‐Magnetic Coupled Absorbers to Macroscopic Patterns

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