MnO2 decorated graphene nanoribbons with superior permittivity and excellent microwave shielding properties

Gupta, Tejendra K.; Singh, Bhanu Pratap; Singh, Vidya Nand; Teotia, Satish; Singh, Awantika; Elizabeth, Indu; Dhakate, Sanjay R.; Dhawan, S. K.; Mathur, R.B.

doi:10.1039/c3ta14854h

Cited by 215 publications

(104 citation statements)

References 46 publications

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“…† The SE (dB) was found to increase as the thickness was varied from 0.5 to 2.0 mm. 45 The thickness (t) of sample that can satisfy the minimum requirement (SE $ 30 dB) for techno-commercial applications was found to be 0.5 mm < t < 1.0 mm. Hence, it is proposed that a higher loading of Cu nanoparticles in carbon nanocomposites made via a novel technique of electroless coating may enhance the conductivity and electric polarization of the material, which thus induces dipolar and electric polarization in the presence of microwaves, resulting in an enhanced EMI SE.…”

Section: Emi Studies On Htpahs and Cu-nanoparticles-coated Htpahsmentioning

confidence: 99%

Polyaromatic-hydrocarbon-based carbon copper composites for the suppression of electromagnetic pollution

et al. 2014

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A facile method of developing carbon-copper (C-Cu) nanocomposites by coating nanocrystalline Cu on heat-treated polyaromatic hydrocarbons (HTPAHs) has been reported. These synthesized nanocomposites have been extensively characterized by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), a scanning electron microscope (SEM), and transmission electron microscopy (TEM). The synthesized HTPAHs-based C-Cu nanocomposites exhibit improved mechanical and electrical properties, which could be tailored by varying the Cu nanoparticle loading. The highest electromagnetic interference shielding effectiveness (EMI SE) due to absorption and reflection at 12.4 GHz is 46.1 dB and 12.5 dB, respectively, for a 2 mm thick sample resulting in a total shielding effectiveness of 58.7 dB. This observed shielding effectiveness in these C-Cu nanocomposites is far above the threshold shielding effectiveness required for techno-commercial applications, especially in the Ku band of RF.

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Section: Emi Studies On Htpahs and Cu-nanoparticles-coated Htpahsmentioning

confidence: 99%

Polyaromatic-hydrocarbon-based carbon copper composites for the suppression of electromagnetic pollution

et al. 2014

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“…Freestanding graphene papers also show excellent and specific EMI SE [30][31][32]. Gupta et al [31] demonstrated that MnO 2 decorated graphene nanoribbons (GNRs) in paper form possessed outstanding microwave shielding properties.…”

Section: Electromagnetic Interference (Emi) Shieldingmentioning

confidence: 97%

“…Due to the light weight, resistance to corrosion, flexibility, and processing advantages, electrically conducting composites have become popular to replace conventional metal-based EMI shielding materials [28,29]. Graphene is an excellent choice for high-performance EMI shielding in the form of either sheets [26], papers [30][31][32], polymer-based composites, or coatings [33][34][35][36] because of its high conductivity, saturation velocity, flexibility, and mechanical strength [37].…”

Section: Electromagnetic Interference (Emi) Shieldingmentioning

confidence: 99%

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Application of Graphene-Based Transparent Conductors (TCs)

Zheng

Kim

2015

Graphene for Transparent Conductors

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As graphene has several potential advantages over indium tin oxide (ITO) including weight, robustness , flexibility, chemical stability, and cost, many applications, such as touch panels, displays, solar cells, organic light-emitting diode, transistors and other new areas, have been demonstrated [1]. Although the application of graphene for transparent conductors (TCs) is still in its early stage and the performances of some devices presented in this book are in a preoptimized state, the unique functional characteristics can make graphene a strong candidate to replace the currently commercially dominant TC materials [2]. These devices, with their functional, structural, and mechanical requirements, where graphene has been considered to apply are discussed in this chapter. Touch ScreenA touch screen is an electronic visual display that detects the presence and location of a touch [2]. A variety of touch-screen technologies, such as resistive, surface acoustic wave, capacitive, surface capacitance, projected capacitance, has been developed [3]. The most commonly used touch screens are the resistive and capacitive types, which require a sheet resistance of ~ 300-1500 Ω/sq at a transparency of ~ 86-90 % [4]. Graphene has several advantages including flexibility, wear resistance, chemical durability, and low toxicity (Fig. 5.1a-b) compared to the traditional ITO. Based on the successful fabrication of graphene films, with outstanding sheet resistance and transparency, and a large size of tens of centimeters, Bae et al.[5] incorporated them into touch-screen panel devices (Fig. 5.1b). It is revealed that the touch-screen display made from graphene outperformed that of ITO in terms of the applied strain. The former touch screen could handle twice as much strain as conventional ITO-based devices (Fig. 5.1c) [5]. The graphene-based panel resisted up to 6 % strain, which is limited mainly by the silver electrode and not by graphene itself, while the ITO-based touch panel easily broke at just 2-3 % strain.

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“…Besides, Gupta et al [96] investigated the EMI SE of the manganese oxide (MnO 2 ) decorated graphene nanoribbons (GNRs) in X band tended to increase as the MnO 2 -GNRs pellets' thickness increasing from 0.5 to 3.0 mm.…”

Section: Sample Thickness Of Pgnsmentioning

confidence: 98%

Graphene Nanocomposites for Electromagnetic Induction Shielding

Zhai

2015

Graphene-Based Polymer Nanocomposites in Electronics

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The unique properties of graphene, such as high specific surface area, aspect ratio and electrical conductivity, make it very promising to fabricate electromagnetic induction (EMI) shielding materials. In this chapter, we first made a brief introduction about the development of EMI shielding materials as well as the preparation of graphene and polymer/graphene nanocomposites (PGNs). Typical surface modification of graphene to optimize its dispersion within polymer matrix was reviewed later. After that, we presented critical factors for the EMI shielding effectiveness (SE) of PGNs in detail. Meanwhile, the EMI shielding mechanism was introduced associated with corresponding examples.

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MnO2 decorated graphene nanoribbons with superior permittivity and excellent microwave shielding properties

Cited by 215 publications

References 46 publications

Polyaromatic-hydrocarbon-based carbon copper composites for the suppression of electromagnetic pollution

Polyaromatic-hydrocarbon-based carbon copper composites for the suppression of electromagnetic pollution

Application of Graphene-Based Transparent Conductors (TCs)

Graphene Nanocomposites for Electromagnetic Induction Shielding

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