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      Robust ultrahigh electromagnetic interference shielding effectiveness based on engineered structures of carbon nanotube films

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          Summary

          High-performance electromagnetic interference (EMI) shielding materials with ultrathin, flexible, and pliable mechanical properties are highly desired for high-end equipments, yet there remain large challenges in the manufacture of these materials. Here, carbon nanotube film (CNTF)/copper (Cu) nanoparticle (NP) composite films are fabricated via a facile electrodeposition method to achieve high electromagnetic shielding efficiency. Notably, a CNTF/Cu NP composite film with 15 μm thickness can achieve excellent EMI shielding efficiency of ∼248 dB and absolute EMI shielding effectiveness as high as 2.17 × 10 5 dB cm 2 g −1, which are the best values for composite EMI shielding materials with similar or greater thicknesses. These engineered composite films exhibit excellent deformation tolerance, which ensures the robust reliability of EMI shielding efficiency after 20,000 cycles of repeated bending. Our results represent a critical breakthrough in the preparation of ultrathin, flexible, and pliable shielding films for applications in smart, portable and wearable electronic devices, and 5G communication.

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          Highlights

          • Composite materials are fabricated via a facile one-step electrodeposition method

          • Material property is enhanced by a combination of two shielding mechanisms

          • Composite films have excellent durability

          Abstract

          Physics; Electromagnetics; Materials science

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          Most cited references42

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          Electromagnetic interference shielding with 2D transition metal carbides (MXenes)

          Materials with good flexibility and high conductivity that can provide electromagnetic interference (EMI) shielding with minimal thickness are highly desirable, especially if they can be easily processed into films. Two-dimensional metal carbides and nitrides, known as MXenes, combine metallic conductivity and hydrophilic surfaces. Here, we demonstrate the potential of several MXenes and their polymer composites for EMI shielding. A 45-micrometer-thick Ti3C2Tx film exhibited EMI shielding effectiveness of 92 decibels (>50 decibels for a 2.5-micrometer film), which is the highest among synthetic materials of comparable thickness produced to date. This performance originates from the excellent electrical conductivity of Ti3C2Tx films (4600 Siemens per centimeter) and multiple internal reflections from Ti3C2Tx flakes in free-standing films. The mechanical flexibility and easy coating capability offered by MXenes and their composites enable them to shield surfaces of any shape while providing high EMI shielding efficiency.
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            Lightweight and flexible graphene foam composites for high-performance electromagnetic interference shielding.

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              Direct spinning of carbon nanotube fibers from chemical vapor deposition synthesis.

              Many routes have been developed for the synthesis of carbon nanotubes, but their assembly into continuous fibers has been achieved only through postprocessing methods. We spun fibers and ribbons of carbon nanotubes directly from the chemical vapor deposition (CVD) synthesis zone of a furnace using a liquid source of carbon and an iron nanocatalyst. This process was realized through the appropriate choice of reactants, control of the reaction conditions, and continuous withdrawal of the product with a rotating spindle used in various geometries. This direct spinning from a CVD reaction zone is extendable to other types of fiber and to the spin coating of rotating objects in general.
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                Author and article information

                Contributors
                Journal
                iScience
                iScience
                iScience
                Elsevier
                2589-0042
                10 April 2024
                17 May 2024
                10 April 2024
                : 27
                : 5
                : 109525
                Affiliations
                [1 ]Institute of Materials Science and Engineering, Changzhou University, Changzhou 213164, P.R. China
                [2 ]Division of Advanced Nanomaterials, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
                [3 ]Center for Nanofibers and Nanotechnology, National University of Singapore, Singapore 117576, Singapore
                Author notes
                []Corresponding author gongxiaojing2018@ 123456cczu.edu.cn
                [∗∗ ]Corresponding author zzyong2008@ 123456sinano.ac.cn
                [∗∗∗ ]Corresponding author seeram@ 123456nus.edu.sg
                [4]

                These authors contributed equally

                [5]

                Lead contact

                Article
                S2589-0042(24)00746-6 109525
                10.1016/j.isci.2024.109525
                11070331
                38711450
                7ca84d20-8ddd-4db7-a917-05435a4cb5df
                © 2024 The Authors

                This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

                History
                : 10 November 2023
                : 14 January 2024
                : 14 March 2024
                Categories
                Article

                physics,electromagnetics,materials science
                physics, electromagnetics, materials science

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