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      Electromagnetic microwave absorption theory and recent achievements in microwave absorbers

      , , ,
      Carbon
      Elsevier BV

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          Two-dimensional nanocrystals produced by exfoliation of Ti3 AlC2.

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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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              Broadband and tunable high-performance microwave absorption of an ultralight and highly compressible graphene foam.

              The broadband and tunable high-performance microwave absorption properties of an ultralight and highly compressible graphene foam (GF) are investigated. Simply via physical compression, the microwave absorption performance can be tuned. The qualified bandwidth coverage of 93.8% (60.5 GHz/64.5 GHz) is achieved for the GF under 90% compressive strain (1.0 mm thickness). This mainly because of the 3D conductive network.
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                Author and article information

                Journal
                Carbon
                Carbon
                Elsevier BV
                00086223
                October 2020
                October 2020
                : 168
                : 606-623
                Article
                10.1016/j.carbon.2020.07.028
                cf1bca89-4511-4b24-b80d-7e952194acf8
                © 2020

                https://www.elsevier.com/tdm/userlicense/1.0/

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