期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 117, 期 44, 页码 27154-27161出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2009432117
关键词
MXene; interface interactions; mechanical properties; electromagnetic interference shielding
资金
- Excellent Young Scientist Foundation of National Natural Science Foundation of China [51522301]
- National Natural Science Foundation of China [22075009, 51961130388, 21875010, 51103004, 52003011]
- Newton Advanced Fellowship [NAF\R1\191235]
- Beijing Natural Science Foundation [JQ19006]
- 111 Project [B14009]
- National Postdoctoral Program for Innovative Talents [BX20200038]
- China Postdoctoral Science Foundation [2019M660387]
- Excellent Sino-Foreign Young Scientist Exchange Program of China Association for Science and Technology
- Postdoctoral Research Program on Innovative Practice in Jiangmen
- National Training Program on Innovation and Entrepreneurship of China for Undergraduates [201910006167]
Titanium carbide (Ti3C2Tx) MXene has great potential for use in aerospace and flexible electronics due to its excellent electrical conductivity and mechanical properties. However, the assembly of MXene nanosheets into macroscopic high-performance nano-composites is challenging, limiting MXene's practical applications. Here we describe our work fabricating strong and highly conductive MXene sheets through sequential bridging of hydrogen and ionic bonding. The ionic bonding agent decreases interplanar spacing and increases MXene nanosheet alignment, while the hydrogen bonding agent increases interplanar spacing and decreases MXene nanosheet alignment. Successive application of hydrogen and ionic bonding agents optimizes toughness, tensile strength, oxidation resistance in a humid environment, and resistance to sonication disintegration and mechanical abuse. The tensile strength of these MXene sheets reaches up to 436 MPa. The electrical conductivity and weight-normalized shielding efficiency are also as high as 2,988 S/cm and 58,929 dB.cm(2)/g, respectively. The toughening and strengthening mechanisms are revealed by molecular-dynamics simulations. Our sequential bridging strategy opens an avenue for the assembly of other high-performance MXene nanocomposites.
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