Graphene-Based Thermoplastic Composites as Extremely Broadband and Frequency-Dependent EMI Absorbers for Multifunctional Applications

Żerańska-Chudek, Klaudia; Filak, Karolina; Wilczyński, Konrad; Siemion, Agnieszka; Pałka, Norbert; Godziszewski, Konrad; Yashchyshyn, Yevhen; Zdrojek, Mariusz

doi:10.1021/acsaelm.2c00722

Cited by 14 publications

(6 citation statements)

References 31 publications

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“…It is composed of a frequency‐independent resistive component and a frequency‐dependent reactance component 41 . Complex impedance (Z*) was analyzed for PS/EMA/G‐ODA blend nanocomposites to interpret their impedance response to the actionable AC field and is expressed as follows:

{Z}^{\ast }={Z}^{\prime }+{jZ}^{\prime \prime }

where,

{Z}^{\prime }

(real component) represents the resistance part and

{Z}^{\prime \prime }

(imaginary component) denotes the reactance part of the complex impedance 10 . In the LCR (inductance capacitance resistance) circuit, the reactance component is mainly caused by the capacitor (C) and the inductor (L) and generally, it is given by the following equation:

{Z}^{\prime \prime }={Z}_L^{\prime \prime }+{Z}_C^{\prime \prime },

{Z}_L^{\prime \prime }

and

{Z}_C^{\prime \prime }

denote the imaginary impedance of inductor and capacitor respectively, which can be represented by the following two expressions:

{Z}_{\mathrm{L}}^{\prime \prime }=j2\pi fL,

Z_{C}^{''} goodbreak= goodbreak- j {(2 πfC)}^{- 1},

…”

Section: Resultsmentioning

confidence: 99%

“…where, Z 0 (real component) represents the resistance part and Z 00 (imaginary component) denotes the reactance part of the complex impedance. 10 In the LCR (inductance capacitance resistance) circuit, the reactance component is mainly caused by the capacitor (C) and the inductor (L) and generally, it is given by the following equation:…”

Section: Ac Impedancementioning

confidence: 99%

“…The transition from AC to DC electrical conductivity of the composites can be correlated with this observation. The correlation between AC and DC electrical conductivity can be expressed by Equation (10). 42,43 σ…”

Section: Ac Impedancementioning

confidence: 99%

“…Exceptionally high electrical characteristics and a large aspect ratio of graphene help to attain electrical percolation threshold in the polymer composites at a very low graphene concentration. [8][9][10][11] Since it is challenging to mass-produce high-quality graphene, many scientists are focusing on finding ways to increase the electrical conductivity of graphene-loaded polymer nanocomposites by lowering the percolation threshold. 8 One useful strategy is to increase the graphene's quality and uniformity of distribution in the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

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Design of interconnected graphene loaded thermoplastic elastomeric blend composite films for minimizing electromagnetic radiation and efficient heat management

Ghosh,

Paul,

Ghosh

et al. 2024

Polymers for Advanced Techs

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In this work, electrically conductive thermoplastic elastomeric blend composite films based on polystyrene (PS)/ethylene‐co‐methyl acrylate (EMA) filled with functionalized graphene were developed via the solution mixing technique. Morphological analysis revealed that selective localization of amine‐functionalized reduced graphene oxide (G‐ODA) sheets in the EMA phase of co‐continuous binary blend formed a well‐connected dense conductive pathway by graphene sheets ultimately facilitating the double percolation phenomenon. The electrical percolation threshold was achieved at ~2 wt% of G‐ODA loading which was much lower than that for both single polymer composites. An electrical conductivity of 0.9 S/cm was obtained for blend composite film with 10 wt% of graphene concentration whereas for the same filler loading, PS and EMA composites exhibited electrical conductivity of 1.9 × 10−1 and 2.3 × 10−1 S/cm, respectively. The obtained thermal conductivity of the blend composite with 10 wt% of G‐ODA loading was 0.95 W/m K with 400% enhancement compared to the neat blend system. The same composite exhibited increased real and imaginary permittivity of 92 and 83, respectively. The electrical percolation threshold is well‐correlated with the percolation concentration found from storage modulus and thermal conductivity data. The fabricated PS/EMA blend composite film exhibited absorption‐dominant electromagnetic interference SE of −25 and − 35 dB in X‐band frequency (8.2–12.4 GHz) for 10 wt% of graphene loading with a sample thickness of 0.5 and 1 mm, respectively.

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{Z}^{\ast }={Z}^{\prime }+{jZ}^{\prime \prime }

where,

{Z}^{\prime }

(real component) represents the resistance part and

{Z}^{\prime \prime }

{Z}^{\prime \prime }={Z}_L^{\prime \prime }+{Z}_C^{\prime \prime },

{Z}_L^{\prime \prime }

and

{Z}_C^{\prime \prime }

denote the imaginary impedance of inductor and capacitor respectively, which can be represented by the following two expressions:

{Z}_{\mathrm{L}}^{\prime \prime }=j2\pi fL,

Z_{C}^{''} goodbreak= goodbreak- j {(2 πfC)}^{- 1},

…”

Section: Resultsmentioning

confidence: 99%

Section: Ac Impedancementioning

confidence: 99%

Section: Ac Impedancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of interconnected graphene loaded thermoplastic elastomeric blend composite films for minimizing electromagnetic radiation and efficient heat management

Ghosh,

Paul,

Ghosh

et al. 2024

Polymers for Advanced Techs

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show abstract

“…Carbon nanofillers increase the electrical and thermal conductivity of the polymer matrix [ 1 ]. However, to achieve high absorbance, relatively high loadings of carbon nanofillers are needed in the thermoplastic polymer matrix [ 2 ]. This limits the sustainability and affordability of EMI shielding materials.…”

Section: Introductionmentioning

confidence: 99%

Poly(Butylene Succinate) Hybrid Multi-Walled Carbon Nanotube/Iron Oxide Nanocomposites: Electromagnetic Shielding and Thermal Properties

et al. 2023

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To address the ever-increasing electromagnetic interference (EMI) pollution, a hybrid filler approach for novel composites was chosen, with a focus on EMI absorbance. Carbon nanofiller loading was limited to 0.6 vol.% in order to create a sustainable and affordable solution. Multiwall carbon nanotubes (MWCNT) and iron oxide (Fe3O4) nanoparticles were mixed in nine ratios from 0.1 to 0.6 vol.% and 8.0 to 12.0 vol.%, respectively. With the addition of surfactant, excellent particle dispersion was achieved (examined with SEM micrographs) in a bio-based and biodegradable poly(butylene succinate) (PBS) matrix. Hybrid design synergy was assessed for EMI shielding using dielectric spectroscopy in the microwave region and transmittance in the terahertz range. The shielding effectiveness (20–52 dB) was dominated by very high absorption at 30 GHz, while in the 0.1 to 1.0 THz range, transmittance was reduced by up to 6 orders of magnitude. Frequency-independent AC electrical conductivity (from 10−2 to 107 Hz) was reached upon adding 0.6 vol.% MWCNT and 10 vol.% Fe3O4, with a value of around 3.1 × 10−2 S/m. Electrical and thermal conductivity were mainly affected by the content of MWCNT filler. The thermal conductivity scaled with the filler content and reached the highest value of 0.309 W/(mK) at 25 °C with the loading of 0.6 vol.% MWCNT and 12 vol.% Fe3O4. The surface resistivity showed an incremental decrease with an increase in MWCNT loading and was almost unaffected by an increase in iron oxide loading. Thermal conductivity was almost independent of temperature in the measured range of 25 to 45 °C. The nanocomposites serve as biodegradable alternatives to commodity plastic-based materials and are promising in the field of electromagnetic applications, especially for EMI shielding.

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Advances in Preparation Methods and Conductivity Properties of Graphene-based Polymer Composites

Tarhini

Tehrani‐Bagha

2023

Appl Compos Mater

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Graphene-based polymer composites with improved physical properties are of great interest due to their lightweight, conductivity, and durability. They have the potential to partially replace metals and ceramics in several applications which can reduce energy and cost. The obtained properties of graphene-based polymer composites are often linked to the way graphene is dispersed in the polymer matrix. Preparation techniques like solution mixing, melt blending, and in-situ polymerization have been used to obtain graphene-based polymer composites. Dispersing and aligning graphene fillers within the composite is a key factor in enhancing the thermal and electrical conductivity values of the composites due to graphene’s anisotropic properties. The effect of the preparation methods of these composites on their physical-chemical properties is discussed in this review where we presented the advances that were achieved so far in the preparation techniques used showing the highest values ever achieved for electrical and thermal conductivity for these graphene-based polymer composites. Also, we presented the possible applications where graphene-based composites can be utilized.

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Graphene-Based Thermoplastic Composites as Extremely Broadband and Frequency-Dependent EMI Absorbers for Multifunctional Applications

Cited by 14 publications

References 31 publications

Design of interconnected graphene loaded thermoplastic elastomeric blend composite films for minimizing electromagnetic radiation and efficient heat management

Design of interconnected graphene loaded thermoplastic elastomeric blend composite films for minimizing electromagnetic radiation and efficient heat management

Poly(Butylene Succinate) Hybrid Multi-Walled Carbon Nanotube/Iron Oxide Nanocomposites: Electromagnetic Shielding and Thermal Properties

Advances in Preparation Methods and Conductivity Properties of Graphene-based Polymer Composites

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