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      Two-dimensional Mo 1.33C MXene with divacancy ordering prepared from parent 3D laminate with in-plane chemical ordering

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          Abstract

          The exploration of two-dimensional solids is an active area of materials discovery. Research in this area has given us structures spanning graphene to dichalcogenides, and more recently 2D transition metal carbides (MXenes). One of the challenges now is to master ordering within the atomic sheets. Herein, we present a top-down, high-yield, facile route for the controlled introduction of ordered divacancies in MXenes. By designing a parent 3D atomic laminate, (Mo 2/3Sc 1/3) 2AlC, with in-plane chemical ordering, and by selectively etching the Al and Sc atoms, we show evidence for 2D Mo 1.33C sheets with ordered metal divacancies and high electrical conductivities. At ∼1,100 F cm −3, this 2D material exhibits a 65% higher volumetric capacitance than its counterpart, Mo 2C, with no vacancies, and one of the highest volumetric capacitance values ever reported, to the best of our knowledge. This structural design on the atomic scale may alter and expand the concept of property-tailoring of 2D materials.

          Abstract

          Vacancies in 2D materials can influence their properties, however controlling their formation remains a challenge. Here the authors show that selective etching of a 3D laminate with in-plane chemical ordering results in formation of MXenes with ordered divacancies, as well as elevated conductance and supercapacitance.

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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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                Author and article information

                Journal
                Nat Commun
                Nat Commun
                Nature Communications
                Nature Publishing Group
                2041-1723
                25 April 2017
                2017
                : 8
                : 14949
                Affiliations
                [1 ]Thin Film Physics, Department of Physics, Chemistry and Biology (IFM), Linköping University , SE-581 83 Linköping, Sweden
                [2 ]Department of Materials Science and Engineering, Drexel University, Philadelphia , Pennsylvania 19104, USA
                Author notes
                Author information
                http://orcid.org/0000-0002-4073-5242
                http://orcid.org/0000-0001-5036-2833
                http://orcid.org/0000-0003-3775-3279
                http://orcid.org/0000-0003-3203-7935
                Article
                ncomms14949
                10.1038/ncomms14949
                5413966
                28440271
                0ab15bfc-6e72-4063-9360-4d781eafce3d
                Copyright © 2017, The Author(s)

                This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                History
                : 18 October 2016
                : 14 February 2017
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