Electrically conducting graphene-based polyurethane nanocomposites for microwave shielding applications in the Ku band

Bansala, Taruna; Joshi, Mangala; Mukhopadhyay, Samrat; Doong, Ruey‐an; Chaudhary, Manchal

doi:10.1007/s10853-016-0449-8

Cited by 61 publications

(35 citation statements)

References 50 publications

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“…A high negative value means effective EMI attenuation or high shielding against EMI wave penetration. The effect of multiple reflections on the value of SE can be ignored (SE M ~ 0), when total SE is more than −10 dB . Thus, total SE can be given as

SE ((), dB) = {SE}_{R} + {SE}_{A}

…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, TPU/CRG and TPU/TRG nanocomposites might be suitable EMI shielding materials in Ku band frequency region, reducing the escape chances of incident EM wave. The highest absorption efficiency ~95% is obtained for 20 wt % TPU/CRG nanocomposite, whereas ~99.9% absorption efficiency obtained for 10 wt % TPU/TRG nanocomposite [Figures (c) and (c)], which reveals dissipation of the incident EM wave energy on the shielding material in the form of dielectric losses and conduction …”

Section: Resultsmentioning

confidence: 99%

“…The effect of multiple reflections on the value of SE can be ignored (SE M~0 ), when total SE is more than −10 dB. 20 Thus, total SE can be given as…”

Section: Graphene Characterizationmentioning

confidence: 99%

“…In this article, a consolidated study dealing with the preparation of different types of graphene sheets such as CRG, thermally reduced and annealed graphene sheets (TRGs), and graphene sheet based TPU nanocomposites are presented. As discussed in our previous article, the EMI shielding of polymer nanocomposites is majorly governed by a number of parameters namely the aspect ratio, thermal or chemical treatment, dispersion (related to processing conditions) and loading level of graphene sheets. It has been observed from our previous study that 5.5 vol % loading of TRG sheets is sufficient to reduce the incident EM wave strength by ~99.9% in the frequency range of 12.4–18 GHz, when dispersed in TPU matrix at 2 mm thickness .…”

Section: Introductionmentioning

confidence: 99%

“…As discussed in our previous article, the EMI shielding of polymer nanocomposites is majorly governed by a number of parameters namely the aspect ratio, thermal or chemical treatment, dispersion (related to processing conditions) and loading level of graphene sheets. It has been observed from our previous study that 5.5 vol % loading of TRG sheets is sufficient to reduce the incident EM wave strength by ~99.9% in the frequency range of 12.4–18 GHz, when dispersed in TPU matrix at 2 mm thickness . The TRGs were synthesized in lab by thermal exfoliation and annealing process at 800 °C .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Electromagnetic interference shielding behavior of chemically and thermally reduced graphene based multifunctional polyurethane nanocomposites: A comparative study

Bansala

Joshi

Mukhopadhyay

2019

J of Applied Polymer Sci

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This article presents the effect of exfoliation, dispersion, and electrical conductivity of graphene sheets onto the electrical, electromagnetic interference (EMI) shielding, and gas barrier properties of thermoplastic polyurethane (TPU) based nanocomposite films. The chemically reduced graphene (CRG) and thermally reduced/annealed graphene (TRG) having Brunauer–Emmett–Teller surface areas of 18.2 and 159.6 m2/g, respectively, when solution blended with TPU matrix using N,N‐dimethylformamide as a solvent. Graphene sheets based TPU nanocomposites have been evaluated and compared for EMI shielding in Ku band, electrical conductivity, and gas barrier property. TRG/TPU nanocomposite films showed excellent gas barrier against N2 gas as compared to CRG/TPU. The EMI shielding effectiveness for neat CRG and TRG graphene sheets is found to be −80, −45 dB, respectively, at 2 mm thickness. The EMI shielding data revealed that TRG/TPU nanocomposites showed better shielding at lower concentration (10 wt %), while CRG displayed better attenuation at higher concentrations. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47666.

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SE ((), dB) = {SE}_{R} + {SE}_{A}

…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…The effect of multiple reflections on the value of SE can be ignored (SE M~0 ), when total SE is more than −10 dB. 20 Thus, total SE can be given as…”

Section: Graphene Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Electromagnetic interference shielding behavior of chemically and thermally reduced graphene based multifunctional polyurethane nanocomposites: A comparative study

Bansala

Joshi

Mukhopadhyay

2019

J of Applied Polymer Sci

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Evolving Strategies for Producing Multiscale Graphene‐Enhanced Fiber‐Reinforced Polymer Composites for Smart Structural Applications

et al. 2020

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Graphene has become an important research focus in many current fields of science including composite manufacturing. Developmental work in the field of graphene‐enhanced composites has revealed several functional and structural characteristics that promise great benefits for their use in a broad range of applications. There has been much interest in the production of multiscale high‐performance, lightweight, yet robust, multifunctional graphene‐enhanced fiber‐reinforced polymer (gFRP) composites. Although there are many reports that document performance enhancement in materials through the inclusion of graphene nanomaterials into a matrix, or its integration onto the reinforcing fiber component, only a few graphene‐based products have actually made the transition to the marketplace. The primary focus of this work concerns the structural gFRPs and discussion on the corresponding manufacturing methodologies for the effective incorporation of graphene into these systems. Another important aspect of this work is to present recent results and highlight the excellent functional and structural properties of the resulting gFRP materials with a view to their future applications. Development of clear standards for the assessment of graphene material properties, improvement of existing materials and scalable manufacturing technologies, and specific regulations concerning human health and environmental safety are key factors to accelerate the successful commercialization of gFRPs.

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Recent Advancements of MXene/Nanocellulose‐Based Hydrogel and Aerogel: A Review

Ahmed,

Hossain,

Al Parvez

et al. 2023

Adv Energy and Sustain Res

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MXenes have been highly attractive to researchers owing to their layered nanostructure, excellent electrical conductivity, and abundance of functional groups. Meanwhile, nanocellulose materials, known for their biodegradability, renewability, compatibility with living organisms, and cost‐effectiveness, have emerged as a popular choice for material selection researchers. Recent research has discovered that combining nanocellulose with MXenes can improve the mechanical properties of MXenes, resulting in composite materials with remarkable electrical and mechanical properties. This article provides an overview of the three main types of nanocellulose: cellulose nanofiber, cellulose nanocrystal, and bacterial cellulose. It also discusses various synthesis methods for MXenes, including MXene/nanocellulose‐based hydrogel and aerogel. Additionally, the article highlights the multiple uses of MXene/nanocellulose composites in different fields, including flexible sensing materials, electromagnetic shielding, energy storage structures, and wearable health monitoring. This review covers distinctive characteristics and unique MXene/nanocellulose composite behaviors, their recent advancements in MXene/nanocellulose synthesis, and applications. Moving forward, the potential for these materials to be used innovatively with anticipation of taking the MXene/nanocellulose‐based research further steps across the respective scientific community.

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Electrically conducting graphene-based polyurethane nanocomposites for microwave shielding applications in the Ku band

Cited by 61 publications

References 50 publications

Electromagnetic interference shielding behavior of chemically and thermally reduced graphene based multifunctional polyurethane nanocomposites: A comparative study

Electromagnetic interference shielding behavior of chemically and thermally reduced graphene based multifunctional polyurethane nanocomposites: A comparative study

Evolving Strategies for Producing Multiscale Graphene‐Enhanced Fiber‐Reinforced Polymer Composites for Smart Structural Applications

Recent Advancements of MXene/Nanocellulose‐Based Hydrogel and Aerogel: A Review

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