TY - JOUR
T1 - Anisotropic MXene Aerogels with a Mechanically Tunable Ratio of Electromagnetic Wave Reflection to Absorption
AU - Han, Meikang
AU - Yin, Xiaowei
AU - Hantanasirisakul, Kanit
AU - Li, Xinliang
AU - Iqbal, Aamir
AU - Hatter, Christine B.
AU - Anasori, Babak
AU - Koo, Chong Min
AU - Torita, Takeshi
AU - Soda, Yoshito
AU - Zhang, Litong
AU - Cheng, Laifei
AU - Gogotsi, Yury
N1 - 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.
PY - 2019/5/17
Y1 - 2019/5/17
N2 - 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.
AB - 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.
KW - MXene
KW - aerogel
KW - anisotropy
KW - compression
KW - electromagnetic wave shielding
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U2 - 10.1002/adom.201900267
DO - 10.1002/adom.201900267
M3 - Article
AN - SCOPUS:85063379312
VL - 7
JO - Advanced Optical Materials
JF - Advanced Optical Materials
SN - 2195-1071
IS - 10
M1 - 1900267
ER -