Carbon nanotubes and carbon nanofibers based co-continuous thermoplastic elastomeric blend composites for efficient microwave shielding and thermal management

Ghosh, Suman Kumar; Das, Tushar Kanti; Ganguly, Sayan; Paul, Sangit; Nath, Krishnendu; Katheria, Ankur; Ghosh, Trisita; Chowdhury, Sreeja Nath; Das, Narayan Ch.

doi:10.1016/j.compositesa.2022.107118

Cited by 48 publications

(46 citation statements)

References 39 publications

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“…The N1s peak is deconvoluted to binding energies 397 eV, and 399 eV corresponding to CNC and CONH bonds respectively (Figure 3I). The atomic composition of MWCNT and MAm particles are also analyzed using the XPS spectrum 18 and the results are almost similar to the EDX analysis given in Table 2 below.…”

Section: Resultsmentioning

confidence: 55%

“…The Nicholson Ross Weir (NRW) method has been employed to study the complex permittivity (

ε)

and permeability (

μ

) of polymer nanocomposite films within the X‐band region of the electromagnetic spectrum 18,39 . S‐parameters from VNA analysis have been employed to calculate reflection co‐efficient (

Γ

) and transmission coefficient (

T

) (Equations 16 and 17) from which complex permittivity and permeability could be calculated.

S_{11} = \{\frac{Γ ((), 1 goodbreak- T^{2})}{(1 - Γ^{2} T^{2})}\}

S_{21} = \{\frac{T ((), 1 goodbreak- Γ^{2})}{(1 - Γ^{2} T^{2})}\}

Here, the reflection coefficient (

Γ

) has two roots from the Equation (18) from where the root (

Γ_{1}

) with value >1 is needed to be chosen.

Γ = X \pm \sqrt{((), X^{2} goodbreak- 1)}

…”

Section: Resultsmentioning

confidence: 99%

“…Aluminum foil is an electrically conductive material that can easily restrict EM waves 18 . Covering the transmitter antenna with the foil and keeping a hole within it will still able the transmitter to send a signal to the receiver through the hole (Figure 12A,B).…”

Section: Resultsmentioning

confidence: 99%

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Design of interconnected 1D nanomaterials with selective localization in biodegradable binary thermoplastic nanocomposite films for effective electromagnetic interference shielding effectiveness

Nath

Ghosh

Katheria

et al. 2022

Polymers for Advanced Techs

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Flexible and electrically conductive polymer nanocomposite materials are gaining popularity as EMI shield materials. Herein, we report the successful fabrication of Thermoplastic polyurethane (TPU)/polybutylene adipate‐co‐terephthalate (PBAT)/dodecyl amine modified multi‐walled carbon nanotubes (MWCNT)‐based biodegradable polymer nanocomposite films employing solvent mixing and casting technique. The FESEM analysis of the cryofractured TPU/PBAT blend (containing 50 wt% of both the polymers) is found to be perfectly co‐continuous. Field emission scanning electron microscopy (FESEM), High‐resolution transmission electron microscopy (HRTEM) analysis followed by a selective dissolution test of polymer nanocomposites revealed that MAm nanofillers are mostly confined to the PBAT phase. The electrical percolation threshold is found to be between 3 and 5 wt% of dodecyl amine modified MWCNT loading as the electrical conductivity and EMI shielding efficiency are found to be shifting from 10−4 to 0.827 S/cm and −29.4 and −36 dB respectively as the nanofiller loading is increased from 3 to 5 wt% keeping the thickness of the polymer nanocomposite films constant at 0.8 mm.

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Section: Resultsmentioning

confidence: 55%

“…The Nicholson Ross Weir (NRW) method has been employed to study the complex permittivity (

ε)

and permeability (

μ

) of polymer nanocomposite films within the X‐band region of the electromagnetic spectrum 18,39 . S‐parameters from VNA analysis have been employed to calculate reflection co‐efficient (

Γ

) and transmission coefficient (

T

) (Equations 16 and 17) from which complex permittivity and permeability could be calculated.

S_{11} = \{\frac{Γ ((), 1 goodbreak- T^{2})}{(1 - Γ^{2} T^{2})}\}

S_{21} = \{\frac{T ((), 1 goodbreak- Γ^{2})}{(1 - Γ^{2} T^{2})}\}

Here, the reflection coefficient (

Γ

) has two roots from the Equation (18) from where the root (

Γ_{1}

) with value >1 is needed to be chosen.

Γ = X \pm \sqrt{((), X^{2} goodbreak- 1)}

…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Design of interconnected 1D nanomaterials with selective localization in biodegradable binary thermoplastic nanocomposite films for effective electromagnetic interference shielding effectiveness

Nath

Ghosh

Katheria

et al. 2022

Polymers for Advanced Techs

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“…The attenuation of electromagnetic radiation is highly reliant on the shielding material's electrical properties. The composite material must have good electrical conductivity for effective EMI shielding [27,54].…”

Section: Emi Sementioning

confidence: 99%

Fabrication of graphene and graphene derivatives based thermoplastic nanocomposite films for high barrier antibacterial packaging, EMI shielding and thermal management applications

Ghosh

Nath

Ganguly

et al. 2022

Preprint

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Multifunctional polymer/graphene nanocomposite based lightweight and flexible films are increasingly being utilized in the packaging, electronics, and pharmaceutical industries together. Herein, three different types of graphene derivatives have been incorporated into linear low density polyethylene (LLDPE) thermoplastic matrix via melt compounding method. As an anisotropic filler that is extensively employed, graphene possesses the ability to not only impose electrical conductivity, but also increase their barrier properties and reinforcement to a larger extent. The microscopic analyses showed that, because of polarity, graphene nanoplatelets are the most significant and accepted filler for homogeneous mixing in the LLDPE matrix. But in order to fabricate a versatile sub-millimeter packaging film, noble metal has been deposited onto the graphene sheets (G-Ag) via wet chemical synthesis method followed by melt mixing with LLDPE matrix. This modification affected the electrical conductivity, barrier properties (both oxygen and water vapor permeability), and UV-transmittance. With 5 wt% of G-Ag, reduced graphene oxide (RGO), and graphene nanoplatelet (GNP) loading, the thermal conductivity of these three nanocomposite films was enhanced by an average of 82%, 77%, and 96%, respectively. Moreover, the film has been tested against both gram-positive and gram-negative bacteria to ensure its bactericidal activity. The prepared graphene derivatives reinforced thin films were also showing EMI shielding values (-21 dB, -17 dB, and -19 dB) more than the commercial cut-offs. Therefore, it is possible to deduce graphene-based thermoplastic nanocomposite, which might be an excellent choice for bacteria-resistant and barrier-capable packaging and efficient thermal management EMI shields in wearable and flexible electronics.

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“…Carbon fibers (CFs) composed of graphene-like carbon, as a submillimeter scale thermal conductive filler, can relieve the interfacial thermal resistance caused by size-effect. − Zeng et al proposed an aligned CFs-based composite with high thermal conductivity, where the CFs network was constructed by a unidirectional freezing technique . Yu et al prepared CFs/phase change material composites with a vertically oriented structure via freeze casting .…”

Section: Introductionmentioning

confidence: 99%

Design of Interconnected Carbon Fiber Thermal Management Composites with Effective EMI Shielding Activity

Qian

Yan

et al. 2022

ACS Appl. Mater. Interfaces

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Heat dissipation efficiency and electromagnetic interference (EMI) shielding performance are vital to integration, miniaturization, and application of electronic devices. Flexible and designable polymer-based composites are promising candidates but suffer from unavoidable interfacial thermal resistances, anisotropic thermal conductivity, and low shielding of EMI limiting application. Herein, multifunctional epoxy resin (EP)-based composites with an interconnected carbon fibers (CFs) network structure containing a low thermal resistance interfacial were prepared by high-temperature calcination and infiltration. The coherent heat and electron transfer pathways constructed with self-oriented CFs cloth connected by carbon nanotubes (CNTs) converted from leaf-shaped zeolitic imidazolate frameworks (ZIF-L) and stable magnetic property provided by cobalt nanoparticles contained in the CNTs made composites to an integrated in-plane thermal conductivity of up to 7.50 W m −1 K −1 , a through-plane thermal conductivity of 1.96 W m −1 K −1, and an EMI shielding effectiveness of 38.4 dB. Furthermore, the mechanical properties of CFs and the junction effect of CNTs endowed the composites with stability of mechanical property, thermal conductivity, and EMI shielding effectiveness after multiple bendings. The finite element simulation further verified the advantage of CFs network linked by CNTs on heat transfer. This work provides the desired design for the construction of a multifunctional polymer-based composite used in advanced electronic equipment.

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Carbon nanotubes and carbon nanofibers based co-continuous thermoplastic elastomeric blend composites for efficient microwave shielding and thermal management

Cited by 48 publications

References 39 publications

Design of interconnected 1D nanomaterials with selective localization in biodegradable binary thermoplastic nanocomposite films for effective electromagnetic interference shielding effectiveness

Design of interconnected 1D nanomaterials with selective localization in biodegradable binary thermoplastic nanocomposite films for effective electromagnetic interference shielding effectiveness

Fabrication of graphene and graphene derivatives based thermoplastic nanocomposite films for high barrier antibacterial packaging, EMI shielding and thermal management applications

Design of Interconnected Carbon Fiber Thermal Management Composites with Effective EMI Shielding Activity

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