Progress in the structural design and properties of Ti3C2Tx-based electromagnetic shielding composites
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摘要: 随着5G网络的普及和电子设备的小型化,电磁辐射给周围环境和人体带来了一定的危害,为此研制综合性能优异的新型电磁干扰屏蔽材料具有十分重要的意义。Ti3C2Tx MXene是一种新型二维材料,具有独特的层状结构、可调节的活性表面、超高电导率等特点,展现出优异的电磁屏蔽性能。近年来,关于Ti3C2Tx的制备方法和填料选择的报道层出不穷,然而从结构设计层面总结Ti3C2Tx基复合材料的工作却很少。高效的结构设计不仅能够减少填料的用量而且能够提高屏蔽效能。本文以结构为主线,对近年来Ti3C2Tx基电磁屏蔽材料的发展趋势进行了总结,通过分析屏蔽效能和屏蔽机制,重点总结不同的结构如多孔结构、分层结构、核壳结构、其他特殊结构及其复合结构对Ti3C2Tx基电磁屏蔽性能的影响及作用,并提出了目前Ti3C2Tx及其复合材料在作为电磁屏蔽材料使用时急需解决的关键科学和技术问题。最后对MXenes的发展前景进行展望。
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关键词:
- Ti3C2Tx基复合材料 /
- 电磁屏蔽 /
- 结构设计 /
- 屏蔽效能 /
- 屏蔽机制
Abstract: With the popularity of 5G network and the miniaturization of electromagnetic equipment, electromagnetic radiation has brought certain harm to the surrounding environment and human body. Therefore, it is of great significance to develop new electromagnetic interference shielding materials with excellent comprehensive performance. Ti3C2Tx MXene is a new type of two-dimensional material with unique layered structure, adjustable active surface, ultra-high conductivity and other characteristics. Thus, it exhibits an excellent electromagnetic shielding performance. In recent years, many researches on its preparation method and filler selection have been reported. However, there is little work to summarize Ti3C2Tx matrix composites from the structural design level. High-efficiency structural design can not only reduce the amount of filler, but also improve shielding effectiveness. This article takes the structure as the main thread and summarizes the development trend of Ti3C2Tx based electromagnetic shielding materials in recent years. By analyzing the shielding effectiveness and mechanism, the article focuses on summarizing the influence and role of different structures such as porous structure, layered structure, core-shell structure, other special structures, and their composite structures on the electromagnetic shielding performance of Ti3C2Tx based materials. And key scientific and technical issues that urgently need to be addressed when Ti3C2Tx and its composite materials are used as electromagnetic shielding materials were proposed. Finally, the development prospect of Ti3C2Tx MXene is prospected. -
图 4 疏水多孔Ti3C2Tx泡沫薄膜[47]和还原氧化石墨烯(rGO)-MXene (rG-M)多孔薄膜[52]的制备流程、微观形貌和屏蔽性能
Figure 4. Preparation flow, microscopic morphology and shielding properties of hydrophobic porous Ti3C2Tx foam films[47] and reduced graphene oxide (rGO)-MXene (rG-M) porous films[52]
MXenes—2D transition-metal carbides; EMI SE—Electromagnetic interference shielding effectiveness; G-M—GO-MXene; SET, SEA, SER—Total, absorption, reflection EMI SE; SGF—Superflexibility graphene film; CuNSs—Copper nanosheets; PGF—Porous graphenefilms; LPGF—Low-temperature porous graphene films; f-MXenes—MXene porous films
图 5 微孔Ti3C2Tx/芳纶纳米纤维(ANFs)复合气凝胶[53]和多孔结构纳米纤维素/Ti3C2Tx复合气凝胶[54]的结构示意图和屏蔽性能
Figure 5. Schematic structure diagram and shielding properties of microporous Ti3C2Tx/aramid nanofibers (ANFs) composite aerogels[53] and porous nanocellulose/Ti3C2Tx composite aerogels[54]
Pure C—Pure CNF aerogels; CA30T5, CA30T10, CA30T20, CA30T40 and CA30T60—CNF/APP/Ti3C2Tx composite aerogels with the mass ratio of 5wt%, 10wt%, 20wt%, 40wt% and 60wt% Ti3C2Tx prepared by the similar method, and all the samples contained 30wt% of APP; CNF—Cellulose nanofiber; APP—Ammonium polyphosphate; SSE/t—Specific SE/thickness
图 11 复合结构活化蛋清(FA)-CNF/MXenes/FA-CNF复合膜的微观形貌和屏蔽性能[82]
Figure 11. Microscopic morphology and shielding performance of FA-CNF/MXenes/FA-CNF composite film with composite structure[82]
FA—Fe3O4@activated egg white derived porous carbon (AEWC); CNFMx—Sandwich-structured FA-CNF/MXene/FA-CNF films, where x stands for the mass ratio of the Ti3C2Tx MXene to CNF
图 12 复合结构Ti3C2Tx/氨基磺酸(SHCNF)薄膜的力学性能和屏蔽性能[86]
Figure 12. Mechanical properties and shielding properties of Ti3C2Tx/holocellulose nanofibrils modified by sulfamic acid (SHCNF) film with composite structure[86]
d-Ti3C2Tx—Delaminated Ti3C2Tx; MH91, MH82, MH64, MH55—Mass ratio of SHCNF and m-Ti3C2Tx is 1:9, 2:8, 3:7, 4:6 and 5:5, respectively; m-Ti3C2Tx—Multilayered Ti3C2Tx; NW—Nanowires; GP—Graphite powder; PPy—Polypyrrole; MG—Magnetic graphene; PVA—Poly(vinyl alcohol); PEDOT:PSS—Poly(3, 4-ethylenedioxythiophene):poly (styrenesulfonate); MWCNT—Multi-walled carbon nanotubes
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