Electromagnetic Interference Shielding Characteristics Research Articles

An investigation into instantaneously tuning the EMI shielding characteristics of CNT-based nanocomposite biofoams in the X-band range by strain loading

The electromagnetic interference (EMI) shielding of CNT-based nanocomposite biofoams is capable of being tailored instantaneously by mechanical loading. In contrast to tuning the EMI shielding via nanofillers or by decoration process, the strain-activated EMI tailoring characteristics possess enormous potential that still await to be explored. To reveal this tailoring mechanism, a multi-scale electro-magneto-mechanically coupled homogenization model is developed to tailor the EMI characteristics of CNT-based nanocomposite biofoams in the X-band range (8.2–12.4 GHz). In this development, the elastic moduli, complex conductivity, and complex permeability are all selected as the homogenization variables. Four categories of interface effects are considered, including imperfect interface bonding, electron tunneling, Maxwell-Wagner-Sillars polarization, and electron hopping. The predicted EMI tailoring characteristics are validated by the experiment of CNT/wheat flour nanocomposite biofoam over a wide range of stain loading. The effective EMI shielding behavior decreases with the compressive loading, but it increases with the tensile loading. It is found that a CNT content higher than the percolation threshold is necessary to tailor the EMI shielding behavior of this nanocomposite foam via strain loading. This study can provide innovative insights to tune the EMI shielding characteristics of CNT-based nanocomposite biofoams in X-band instantaneously.

Synergistic phases in isopropanol electrospun for Fe2O3/Fe3O4@C@MoS2 nanofibers for enhanced electromagnetic interference shielding characteristics and impedance analysis

Co-existence of phases in Fe2O3/Fe3O4@C@MoS2 nanofibers composite is synthesized via electrospinning and hydrothermal processes, where iso-propanol is utilized as a solvent. An extensive analysis is performed to evaluate the different properties, such as dielectric, morphological, structural, impedance, and electromagnetic shielding efficiency. A crystallite size of 24 nm is calculated using the Debye-Scherer formula. By using impedance spectroscopy, the electrical behavior of Fe2O3/Fe3O4@C@MoS2 nanofibers is described. Variations in frequency and temperature-dependent relaxation times are compared in an impedance plane plot. Changes in the conduction mechanism at different temperatures are observed. In Fe2O3/Fe3O4@C@MoS2 nanofibers composites, a number of distinctive characteristics in this work are explained, including stable dielectric constant, low tangent loss small polaronic hopping (SPH), and variable range hoping (VRH) model. The localization length of Fe2O3/Fe3O4@C@MoS2 nanofibers is calculated, 1/α = 1.2 Å. The typical EMI shielding efficiency of about 23 dB is demonstrated by the Fe2O3/Fe3O4@C@MoS2 nanofibers composite in the X-band frequency range. This extraordinary shielding capacity is observed in 3 mm thick nanofibers.

Lightweight biodegradable porous poly(propylene carbonate)/carbon nanostructures nano/microcellular structures with enhanced foamability, good electromagnetic interference shielding, and low permanent strain

Poly(propylene carbonate)/carbon nanostructures (PPC/CNS) composite foam with excellent comprehensive performance was successfully fabricated using supercritical carbon dioxide (Sc-CO2) as the physical foaming agent. Transmission electron microscope analysis revealed that the CNS was uniformly dispersed within the PPC matrix. This effective dispersion of CNS, coupled with enhanced melt strength, consequently facilitated the foamability of PPC/CNS composites. Remarkably, at a CNS loading of 3 wt%, the cell size of PPC/CNS composite foam reduced from micron to nanoscale dimensions, resulting in a cell density surpassing 1013 cell/cm3. Furthermore, the prepared PPC/CNS composite and its foams exhibited promising potential for applications in electromagnetic interference (EMI) shielding and sensor. For instance, by incorporating 3.0 wt% CNS, the EMI SSE reached 84.70 dB cm3/g after foaming, which exhibited favorable EMI shielding characteristics. Moreover, the composite foam exhibited excellent resilience and stability, led to a reduction of residual strain to less than 11 % after 10 cyclic compression tests.

Graphene Nanocomposites for Electromagnetic Interference Shielding—Trends and Advancements

Electromagnetic interference is considered a serious threat to electrical devices, the environment, and human beings. In this regard, various shielding materials have been developed and investigated. Graphene is a two-dimensional, one-atom-thick nanocarbon nanomaterial. It possesses several remarkable structural and physical features, including transparency, electron conductivity, heat stability, mechanical properties, etc. Consequently, it has been used as an effective reinforcement to enhance electrical conductivity, dielectric properties, permittivity, and electromagnetic interference shielding characteristics. This is an overview of the utilization and efficacy of state-of-the-art graphene-derived nanocomposites for radiation shielding. The polymeric matrices discussed here include conducting polymers, thermoplastic polymers, as well as thermosets, for which the physical and electromagnetic interference shielding characteristics depend upon polymer/graphene interactions and interface formation. Improved graphene dispersion has been observed due to electrostatic, van der Waals, π-π stacking, or covalent interactions in the matrix nanofiller. Accordingly, low percolation thresholds and excellent electrical conductivity have been achieved with nanocomposites, offering enhanced shielding performance. Graphene has been filled in matrices like polyaniline, polythiophene, poly(methyl methacrylate), polyethylene, epoxy, and other polymers for the formation of radiation shielding nanocomposites. This process has been shown to improve the electromagnetic radiation shielding effectiveness. The future of graphene-based nanocomposites in this field relies on the design and facile processing of novel nanocomposites, as well as overcoming the remaining challenges in this field.

Electromagnetic Interference Shielding Performances of Carbon-Fiber-Reinforced PA11/PLA Composites in the X-Band Frequency Range.

To solve the problem of increasing electromagnetic pollution, it is crucial to develop electromagnetic interference (EMI) shielding materials. Using lightweight, inexpensive polymeric composites instead of currently used metal shielding materials is promising. Therefore, bio-based polyamide 11/poly(lactic acid) composites with various carbon fiber (CF) amounts were prepared using commercial extrusion and injection/compression molding methods. The prepared composites' morphological, thermal, electrical conductivity, dielectric, and EMI shielding characteristics were investigated. The strong adhesion between the matrix and CF is confirmed by scanning electron microscopy. The addition of CF led to an increase in thermal stability. As CFs formed a conductive network in the matrix, direct current (DC) and alternative current (AC) conductivities of the matrix increased. Dielectric spectroscopy measurements showed an increase in the dielectric permittivity/energy-storage capability of the composites. Thus, the EMI shielding effectiveness (EMI SE) has also increased with the inclusion of CF. The EMI SE of the matrix increased to 15, 23, and 28 dB, respectively, with the addition of 10-20-30 wt % CF at 10 GHz, and these values are comparable or higher than other CF-reinforced polymer composites. Further analysis revealed that shielding was primarily accomplished by the reflection mechanism similar to the literature data. As a result, an EMI shielding material has been developed that can be used in commercially practical applications in the X-band region.

Flexible Polypyrrole-Coated Polyamide Based Mats for Broadband Microwave Absorption and Electromagnetic Interference Shielding with Low Reflection

Electromagnetic interference (EMI) -shielding and microwave-absorbing materials are of great significance in the fields of microelectronics and telecommunication to achieve electromagnetic protection and compatibility. However, it still remains a challenge to design and fabricate materials integrating both microwave absorbing and shielding properties. In this study, we prepared fluffy and porous EMI shielding materials via facile vapor deposition of pyrrole (Py) on commercial polyamide fibrous mats (FMs). The uniform polypyrrole (PPy) coating on the fiber surface endows the FM with a favorable three-dimensional (3D) conductive network. By the combination of a highly porous microstructure, the fabricated polyamide fibrous mat@polypyrrole (FM@PPy) presents excellent microwave-absorbing and EMI-shielding properties. The EMI shielding efficiency (EMI SE) of FM@PPy can reach 40 dB with a high absorption coefficient (A) of 0.8, showing extremely low reflection with “green” EMI shielding characteristics in the whole X-band (8.2–12.4 GHz). Meanwhile, the reflection loss (RL) of FM@PPy is less than −10 dB in the X-band. Moreover, FM@PPy also exhibits favorable stability and reliability as a wearable sensor. The FM@PPy demonstrates promising potential for “green” EMI shielding, broadband microwaves absorbing and highly stable intelligent sensor.

MXene-cellulose nanofiber composites: toward green, multi-functional, flexible, and highly efficient electromagnetic interference shielding materials

In the current fast-paced digital world, electronic devices have become an inevitable part of our lives, contributing to increasing electromagnetic interference (EMI) that may unfavorably affect our health as well as the precision of miniaturized electronics. Therefore, developing efficient multi-functional EMI shielding materials is of immense interest and importance. EMI shielding technology requires materials possessing high conductivity, permeability, permittivity, processability, and corrosion resistance while being cost-effective and environmentally friendly. The EMI shielding characteristics of MXene, as a novel flourishing 2D material, have been extensively explored in recent years owing to its excellent electrical, thermal, and mechanical properties. Cellulose nanofibers (CNFs) that can be obtained from biomass and upcycling waste, benefiting from numerous advantages such as biodegradability, high aspect ratio, processability, and low cost, can be utilized as a matrix, binder, or derived carbon material. Amalgamating the outstanding properties of these two materials, this paper reviews recent advancements in the field of CNF/MXene nanocomposites. After a brief introduction on CNF and MXene, the role of the structure in the mechanism of attenuation of the electromagnetic wave is discussed. Emphasis is given to the effect of the type and content of the conductive material, thickness, and fabrication method on EMI shielding effectiveness and conductivity. An elaborate discussion on the gaps in achieving multi-functional and flexible composites based on CNF and MXene exhibiting high EMI shielding and potential application in aerospace and wearable sensors is reported as well.

Effects of pore structure on wide-frequency electromagnetic interference shielding performance of carbonized wood

Carbonized wood attracts widespread attention in the field of electromagnetic interference (EMI) shielding thanks to its layered porous structure and high electrical conductivity. Understanding the correlation between pore structure and shielding performance is crucial for constructing efficient EMI shielding materials. Herein, pore structures are monitored by changing the compression ratio during the hot pressing. Carbonized wood with a 40% compression ratio displays a superior EMI shielding effectiveness (SE) up to 71.69 dB in K-band, owing to the optimal structure. EMI shielding characteristics of carbonized wood in different frequency ranges are also studied. The effects of pore structure on the shielding performance are further illuminated by finite element analysis. After structure optimization, carbonized wood can demonstrate high EMI shielding performance, wide-frequency coverage, terahertz band use, and excellent heat dissipation. This work inspires the design of next-generation sustainable EMI shielding materials.

Fe3O4 uniformly decorated reduced graphene oxide aerogel for epoxy nanocomposites with high EMI shielding performance

This work reports the successful fabrication of Fe3O4@anisotropic reduced graphene oxide aerogel/epoxy (Fe3O4@AGA/EP) nanocomposites, with outstanding electromagnetic interference (EMI) shielding performance and mechanical properties. One-step hydrothermal reduction reaction and unidirectional freezing approach were utilized in order to avoid the agglomeration of Fe3O4 and graphene oxide (GO). The Fe3O4@AGA/EP nanocomposites were subsequently obtained by freeze-drying, annealing treatment, EP infiltrating and curing processes. Due to the synergistic effect of the Fe3O4 (with magnetic and dielectric loss properties) and the three-dimensional AGA framework (presents high electrical conductivity), the EMI shielding efficiency of Fe3O4@AGA/EP nanocomposites reached 40.4 dB along the radial direction when the mass ratio of FeSO4: GO was 2: 1. Simultaneously, an enhanced storage modulus of 116% was exhibited compared with that of the pure EP. Moreover, the nanocomposites showed absorption-dominated EMI shielding characteristics, which is significant for the reduction of secondary pollution of electromagnetic waves. This research provides a one-step hydrothermal reduction method to address the agglomeration of Fe3O4 and prepare EP-based composites with high EMI shielding performance and mechanical properties.

PANI/CFO@CNTs ternary composite system for EMI shielding applications

With the advancement of modern communication technologies and the internet of things (IoT), the manufacturing of light, flexible, and high-performance electromagnetic interference (EMI) shields is imperative to minimize harmful effects of radiation on humans and electronic devices. Lightweight ferrites/carbon allotropes/polymer-based ternary composites with abundant interfaces are potential candidates for excellent absorption materials due to their high attenuation capability and impedance matching. We report EMI shielding properties of composites made of carbon nanotubes (CNTs) decorated with cobalt ferrite (CFO) nanoparticles and coated with polyaniline (PANI). The electromagnetic properties of the CFO@CNTs binary composite have been fine-tuned by varying the weight percentage of CNTs. The formation of CFO, CNTs and emeraldine form of PANI was confirmed by XRD and Raman spectroscopy. Transmission electron microscopy (TEM) revealed uniform attachment of CFO nanoparticles to the walls of CNTs, formation of 3D networks in the CFO@CNTs binary composite and its effective encapsulation by PANI. Benefiting from the controllable composition, 3D networking, porous structure of PANI, and strong complementary effect between CFO and CNTs (source of magnetic and dielectric losses), the PANI/CFO@CNTs ternary composite exhibited superior EMI shielding characteristics with a total shielding effectiveness of 16.80 dB corresponding to 97.90 % attenuation at a thickness of 2 mm. Considering the excellent EMI shielding properties, PANI/CFO@CNTs ternary composites can be employed as high-performance EMI shields.

Graphene-Based Electrospun Fibrous Materials with Enhanced EMI Shielding: Recent Developments and Future Perspectives.

As a result of advancements in electronics/telecommunications, electromagnetic interference (EMI) pollution has gotten worse. Hence, fabrication/investigation of EMI shields having outstanding EMI shielding performance is necessary. Electrospinning (ES) has recently been established in several niches where 1D nanofibers (NFs) fabricated by ES can provide the shielding of EM waves, owing to their exceptional benefits. This review presents the basic correlations of ES technology and EMI shielding. Diverse graphene (GP)-based fibrous materials directly spun via ES as EMI shields are discussed. Electrospun EMI shields as composites through diverse post-treatments are reviewed, and then different factors influencing their EMI shielding characteristics are critically summarized. Finally, deductions and forthcoming outlooks are given. This review provides up to date knowledge on the advancement of the application of graphene-based electrospun fibers/composite materials as EMI shields and the outlook for high-performance electrospun fibers/composite-based EMI shielding materials.

Sandwich-like high-efficient EMI shielding materials based on 3D conductive network and porous microfiber skeleton

High-efficient and durable electromagnetic interference (EMI) shielding materials are urgently needed to address electromagnetic wave pollution. In this study, Ti3C2TX MXene and silver nanowires (AgNWs) were integrated at a porous microfiber skeleton (PMS) via a dip-coating method to form a sandwich-like conductive network, followed by a polyurethane (PU) fixation. Firstly, PMS was dipped with AgNWs dispersion (1D AgNWs acts as the interlayer) and then immersed in Ti3C2TX MXene nanosheets suspension (2D Ti3C2TX MXene acts as the upper and lower layers). Finally, an EMI shielding material with a sandwich-like conductive network was constructed by immersing it in diluted PU solution at ambient temperature for fixation. The conductivity of the resultant shielding material is found to be 1896.7 s⸱m-1, correspondingly, the average EMI shielding effectiveness (SE) is as high as 100.1 dB. The ideal conductivity of AgNWs and Ti3C2TX MXene, combined with the porous structure of microfiber substrate are believed to impart the resultant material excellent EMI shielding characteristics. In addition, benefiting from the protective effect of the outermost PU thin layer, the coated materials still remain their high shielding performance even after ultrasonic washing for 30 min (100 W), strong acid (pH 2.0), strong base (pH 12.0), 2000 bending-releasing cycles, 2000 folding-releasing cycles, and 1000 twisting-releasing cycles, showing excellent EMI shielding durability.

Epoxy Coatings Containing Modified Graphene for Electromagnetic Shielding.

This study presents the functionalization and characterization of graphene and electromagnetic interference (EMI) attenuation capacity in epoxy-nanocomposites. The modification of graphene involved both small molecules and polymers for compatibilization with epoxy resin components to provide EMI shielding. The TGA and RAMAN analyses confirmed the synthesis of graphene with a different layer thickness of the graphene sheets. Graphene samples with different layer thicknesses (monolayer, few layers, and multilayer) were selected and further employed for epoxy coating formulation. The obtained nanocomposites were characterized in terms of EMI shielding effectiveness, SEM, micro-CT, magnetic properties, and stress-strain resistance. The EMI shielding effectiveness results indicated that the unmodified graphene and hexamethylene diamine (HMDA) modified graphene displayed the best EMI shielding properties at 11 GHz. However, the epoxy nanocomposites based on HMDA modified graphene displayed better flexibility with an identical EMI shielding effectiveness compared to the unmodified graphene despite the formation of aggregates. The improved flexibility of the epoxy nanocomposites and EMI shielding characteristics of HMDA functionalized graphene offers a practical solution for textile coatings with microwave absorbing (MA) capacity.

Effect of dielectric and magnetic nanofillers on electromagnetic interference shielding effectiveness of carbon/epoxy composites

Tremendous development in electronic devices and their indiscriminate use has created a severe problem of electromagnetic pollution. Different types of electromagnetic interference (EMI) shielding materials and structures are used to protect electronic devices from the harmful effect of electromagnetic pollution. A present study was conducted to compare the effect of dielectric and magnetic nanofillers on electromagnetic shielding effectiveness (EMI SE) of carbon fiber reinforced composite structures (CFRC). Composites structures were developed using different dielectric and magnetic nanofillers. Effect of nanofillers on microwave absorption properties and reduction in electromagnetic pollution was investigated. Relationship between electrical conductivity and EMI shielding effectiveness in L, S, C, and X-frequency range was also studied. Among the dielectric nanofillers, silicon carbide showed excellent EMI SE in X-frequency range, while among magnetic nanofillers, zinc oxide showed excellent EMI shielding characteristics in a broad frequency range of 100 MHz to 13.6 GHz. Among magnetic nanofillers, CFRC with zinc oxide nanofillers showed the lowest skin depth value of 3.32 × 10−4 mm and among dielectric nanofiller, CFRC with silicon carbide nanofillers gave the lowest skin depth value of 6.49 × 10−4 mm, implying their excellent potential in EMI shielding applications.

High-Performance, Lightweight, and Flexible Thermoplastic Polyurethane Nanocomposites with Zn2+-Substituted CoFe2O4 Nanoparticles and Reduced Graphene Oxide as Shielding Materials against Electromagnetic Pollution.

The development of flexible, lightweight, and thin high-performance electromagnetic interference shielding materials is urgently needed for the protection of humans, the environment, and electronic devices against electromagnetic radiation. To achieve this, the spinel ferrite nanoparticles CoFe2O4 (CZ1), Co0.67Zn0.33Fe2O4 (CZ2), and Co0.33Zn0.67Fe2O4 (CZ3) were prepared by the sonochemical synthesis method. Further, these prepared spinel ferrite nanoparticles and reduced graphene oxide (rGO) were embedded in a thermoplastic polyurethane (TPU) matrix. The maximum electromagnetic interference (EMI) total shielding effectiveness (SET) values in the frequency range 8.2–12.4 GHz of these nanocomposites with a thickness of only 0.8 mm were 48.3, 61.8, and 67.8 dB for CZ1-rGO-TPU, CZ2-rGO-TPU, and CZ3-rGO-TPU, respectively. The high-performance electromagnetic interference shielding characteristics of the CZ3-rGO-TPU nanocomposite stem from dipole and interfacial polarization, conduction loss, multiple scattering, eddy current effect, natural resonance, high attenuation constant, and impedance matching. The optimized CZ3-rGO-TPU nanocomposite can be a potential candidate as a lightweight, flexible, thin, and high-performance electromagnetic interference shielding material.

Robust superhydrophobic and porous melamine-formaldehyde based composites for high-performance electromagnetic interference shielding

The high electromagnetic interference (EMI) shielding performance composites with light-weight and multi-function have become the main developing orientation in the EMI shielding materials field. This study aims to fabricate lightweight melamine-formaldehyde-based composite (SiO2@Ag@MF) foams with high EMI shielding characteristics through facile and green electroless silver (Ag) plating and polydimethylsiloxane/SiO2 (PDMS/SiO2) coating methods. The results indicated that SiO2@Ag@MF foam possessed outstanding EMI shielding performance with the maximum shielding effectiveness (SET) of 65 dB, low density (0.014–0.019 g/cm3), and high specific shielding effectiveness (SSET) of 3439 dB cm3 g−1 due to the open-cell porous structure and high electroconductive Ag-plated skeleton. Meanwhile, because of the PDMS and SiO2 coating, the composite foam delivers superhydrophobicity, anti-corrosion, and anti-fatigue performance.

Off/on switchable smart electromagnetic interference shielding aerogel

Summary Smart electromagnetic interference (EMI) shielding materials with tunable EM wave response characteristics are attractive for future EM devices. Here, we report an off/on switchable EMI shielding material that can be tuned from EM wave transmission to shielding and vice versa by mechanical compression and decompression. This smart material is prepared by filling conductive carbon nanoparticles into wood-derived lamellar carbon aerogel, showing reversible compressibility and strain-sensitive conductivity. The original aerogel has good impedance matching and low dielectric loss, allowing the EM wave to pass through. Mechanical compression enables the carbon nanoparticles to establish highly conductive pathways in the aerogel, which significantly increases the conductivity of aerogel and thus activates its EMI shielding performance. This function switch is reversible by repeatedly compressing and decompressing the aerogel. The availability of such a never-before-realized off/on switchable EMI shielding material provides an opportunity for the development of advanced smart EM devices.

Excellent, Lightweight and Flexible Electromagnetic Interference Shielding Nanocomposites Based on Polypropylene with MnFe2O4 Spinel Ferrite Nanoparticles and Reduced Graphene Oxide.

In this work, various tunable sized spinel ferrite MnFe2O4 nanoparticles (namely MF20, MF40, MF60 and MF80) with reduced graphene oxide (RGO) were embedded in a polypropylene (PP) matrix. The particle size and structural feature of magnetic filler MnFe2O4 nanoparticles were controlled by sonochemical synthesis time 20 min, 40 min, 60 min and 80 min. As a result, the electromagnetic interference shielding characteristics of developed nanocomposites MF20-RGO-PP, MF40-RGO-PP, MF60-RGO-PP and MF80-RGO-PP were also controlled by tuning of magnetic/dielectric loss. The maximum value of total shielding effectiveness (SET) was 71.3 dB for the MF80-RGO-PP nanocomposite sample with a thickness of 0.5 mm in the frequency range (8.2–12.4 GHz). This lightweight, flexible and thin nanocomposite sheet based on the appropriate size of MnFe2O4 nanoparticles with reduced graphene oxide demonstrates a high-performance advanced nanocomposite for cutting-edge electromagnetic interference shielding application.

Multifunctional Graphene Composites for Electromagnetic Shielding and Thermal Management at Elevated Temperatures

AbstractA method for scalable synthesis of epoxy composites with graphene and few‐layer graphene fillers is described, and the electromagnetic interference (EMI) shielding and thermal properties of such composites at elevated temperatures are reported. The tested materials reveal excellent total EMI shielding of SET ≈ 65 dB (≈ 105 dB) at a thickness of 1 mm (≈ 2 mm) in the X‐band frequency range. At higher filler loading fractions, composites reveal a room‐temperature cross‐plane thermal conductivity of 11.2 ± 0.9 Wm−1 K−1, which is a factor of ×41 larger than that of the pristine epoxy. Interestingly, the EMI shielding efficiency improves further as the temperature increases while the thermal conductivity remains approximately constant. The enhancement in the EMI shielding is explained by the temperature dependence of the two electrical conduction mechanisms, electronic band‐type conduction inside the fillers, and hopping conduction between the fillers. The excellent EMI shielding and heat conduction characteristics of such multifunctional graphene composites at high temperatures are promising for packaging applications of microwave components where EMI shielding and thermal management are important design considerations.

Excellent electromagnetic interference shielding characteristics of a unidirectionally oriented thin multiwalled carbon nanotube/polyethylene film

In this study, we synthesized oriented multiwalled carbon nanotube (CNT)/polyethylene (PE) composite films and investigated their electromagnetic interference (EMI) shielding properties. The oriented CNT sheet structure was prepared by stacking CNT webs produced by a dry spinning technique with a CNT forest. In a near-field EMI attenuation measurement by a microstrip line method, composite films with a CNT fraction higher than 2 wt% showed a high attenuation that exceeded 50 dB at 10 GHz. This high attenuation was due to the enhanced magnetic anisotropy of the oriented CNTs and the encapsulated catalyst-derived cementite nanoparticles. This is the first report of high magnetic anisotropy in an oriented CNT structure for noise attenuation in a transmission line. In a far-field EMI shielding measurement by a coaxial tube method, the EMI shielding effectiveness (SE) significantly increased as the number of CNT web layers increased. A CNT/PE film with a high CNT fraction was found to have a high specific EMI SE of 0.6 dB/μm. The oriented CNT/PE composite film has great potential as a promising EMI material that demonstrates high shielding efficiency performance with low CNT loading.