Anisotropic MXene Aerogels with a Mechanically Tunable Ratio of Electromagnetic Wave Reflection to Absorption

Meikang Han, Xiaowei Yin, Kanit Hantanasirisakul, Xinliang Li, Aamir Iqbal, Christine B. Hatter, Babak Anasori, Chong Min Koo, Takeshi Torita, Yoshito Soda, Litong Zhang, Laifei Cheng, Yury Gogotsi

Research output: Contribution to journalArticlepeer-review

252 Citations (Scopus)

Abstract

Lightweight and mechanically flexible materials that can provide efficient electromagnetic interference (EMI) shielding are highly desirable for protecting portable and smart electronic devices against electromagnetic pollution. Here, the authors report a tunable design of a three-dimensional (3D) porous aerogel structure made of 2D transition metal carbides and a carbonitride (MXene) with a long-range order of aligned lamellar architecture for EMI shielding. Bidirectional freeze-casting of MXene colloidal solutions is used to fabricate robust, compressible and lightweight aerogels, and achieve orientational assembly leading to outstanding EMI shielding performance and tunable ratio of reflection to absorption. EMI shielding effectiveness (SE) of three types of MXene aerogels (Ti 3 C 2 T x , Ti 2 CT x , and Ti 3 CNT x ) reaches 70.5, 69.2, and 54.1 dB, respectively, while keeping the compression thickness at 1 mm and a density of only ≈11.0 mg cm −3 . The highest specific SE reaches 8818.2 dB cm 3 g −1 , which is among the best values reported for EMI shielding materials. More importantly, during the compression process of the MXene aerogels, the ratio of electromagnetic wave reflection to absorption increases without noticeable change of the total EMI SE. Compressible MXene aerogels with aligned layers offer an effective approach to control the electromagnetic wave absorption and reflection in EMI shielding materials.

Original languageEnglish
Article number1900267
JournalAdvanced Optical Materials
Volume7
Issue number10
DOIs
Publication statusPublished - 2019 May 17
Externally publishedYes

Bibliographical note

Funding Information:
The authors thank Dr. Christopher Li and Sarah Gleeson for assistance in mechanical tests and Dr. Xu Xiao for help in TEM observations. Collaboration between Drexel and KIST was supported by the Global Research Development Center Program and Basic Science Research Program of the National Research Foundation (NRF) of Korea funded by the Ministry of Education, Science, and Technology (MEST) (NRF-2015K1A4A3047100, NRF-2015M3A7B6027973; and 2017R1A2B3006469). Research at the Northwestern Polytechnical University was supported by the National Natural Science Foundation of China (Grant No. 51332004), the National Science Fund for Distinguished Young Scholars (Grant No. 51725205), and Excellent Doctorate Foundation of Northwestern Polytechnical University.

Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • MXene
  • aerogel
  • anisotropy
  • compression
  • electromagnetic wave shielding

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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