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      Ultrathin and Flexible CNTs/MXene/Cellulose Nanofibrils Composite Paper for Electromagnetic Interference Shielding

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          Highlights

          • An ultrathin and flexible carbon nanotubes/MXene/cellulose nanofibrils composite paper with gradient and sandwich structure was successfully fabricated via a facile alternating vacuum-assisted filtration process.

          • The composite paper exhibits excellent mechanical property and electromagnetic interference shielding performance.

          Electronic supplementary material

          The online version of this article (10.1007/s40820-019-0304-y) contains supplementary material, which is available to authorized users.

          Abstract

          As the rapid development of portable and wearable devices, different electromagnetic interference (EMI) shielding materials with high efficiency have been desired to eliminate the resulting radiation pollution. However, limited EMI shielding materials are successfully used in practical applications, due to the heavy thickness and absence of sufficient strength or flexibility. Herein, an ultrathin and flexible carbon nanotubes/MXene/cellulose nanofibrils composite paper with gradient and sandwich structure is constructed for EMI shielding application via a facile alternating vacuum-assisted filtration process. The composite paper exhibits outstanding mechanical properties with a tensile strength of 97.9 ± 5.0 MPa and a fracture strain of 4.6 ± 0.2%. Particularly, the paper shows a high electrical conductivity of 2506.6 S m −1 and EMI shielding effectiveness (EMI SE) of 38.4 dB due to the sandwich structure in improving EMI SE, and the gradient structure on regulating the contributions from reflection and absorption. This strategy is of great significance in fabricating ultrathin and flexible composite paper for highly efficient EMI shielding performance and in broadening the practical applications of MXene-based composite materials.

          Electronic supplementary material

          The online version of this article (10.1007/s40820-019-0304-y) contains supplementary material, which is available to authorized users.

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          Most cited references84

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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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              Guidelines for Synthesis and Processing of Two-Dimensional Titanium Carbide (Ti3C2Tx MXene)

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                Author and article information

                Contributors
                mg_ma@bjfu.edu.cn
                pbwan@mail.buct.edu.cn
                fchen@tongji.edu.cn
                Journal
                Nanomicro Lett
                Nanomicro Lett
                Nano-Micro Letters
                Springer Singapore (Singapore )
                2311-6706
                2150-5551
                7 September 2019
                7 September 2019
                December 2019
                : 11
                : 72
                Affiliations
                [1 ]ISNI 0000000123704535, GRID grid.24516.34, Department of Orthopedics, Shanghai Tenth People’s Hospital, , Tongji University School of Medicine, ; Shanghai, 200072 People’s Republic of China
                [2 ]ISNI 0000 0001 1456 856X, GRID grid.66741.32, Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Key Laboratory of Lignocellulosic Chemistry, College of Materials Science and Technology, , Beijing Forestry University, ; Beijing, 100083 People’s Republic of China
                [3 ]ISNI 0000 0000 9931 8406, GRID grid.48166.3d, Center of Advanced Elastomer Materials, State Key Laboratory of Organic-Inorganic Composites, , Beijing University of Chemical Technology, ; Beijing, 100029 People’s Republic of China
                Article
                304
                10.1007/s40820-019-0304-y
                7770921
                0e824f00-c384-4f3c-86ac-844e86d921c7
                © The Author(s) 2019

                Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License ( http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

                History
                : 13 July 2019
                : 18 August 2019
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                © The Author(s) 2019

                mxene,carbon nanotubes,cellulose nanofibrils,mechanical property,electromagnetic interference shielding

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