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.
Bibliographical noteFunding Information:
This work was supported in part by the U.S. National Science Foundation under grant DMR-1310245. F.S., M.A., C.B.H., B.A., S.M.H., C.M.K., and Y.G. are inventors on patent application 62/326,074 submitted by Drexel University that covers MXene films and composites for EMI shielding. M.A. was supported by the Libyan North America Scholarship Program funded by the Libyan Ministry of Higher Education and Scientific Research. This work was also supported by the Fundamental R&D Program for Core Technology of Materials and the Industrial Strategic Technology Development Program funded by the Ministry of Trade, Industry and Energy, and the Disaster and Safety Management Institute by the Ministry of Public Safety and Security of Korean Government, Republic of Korea, and partially by the Korea Institute of Science and Technology.
Copyright © 2016 by the American Association for the Advancement of Science; all rights reserved.
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