Wang Jiaen, Ming Wei, Chen Longfu, Song Tianliang, Yele Moxi, Zhang Hao, Yang Long, Sarula Gegen, Liang Benliang, Yan Luting, Wang Guangsheng
School of Physical Science and Engineering, Beijing Jiaotong University, Beijing, 100044, People's Republic of China.
Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, People's Republic of China.
Nanomicro Lett. 2024 Oct 11;17(1):36. doi: 10.1007/s40820-024-01496-0.
The design and fabrication of high toughness electromagnetic interference (EMI) shielding composite films with diminished reflection are an imperative task to solve electromagnetic pollution problem. Ternary MXene/ANF (aramid nanofibers)-MoS composite films with nacre-like layered structure here are fabricated after the introduction of MoS into binary MXene/ANF composite system. The introduction of MoS fulfills an impressive "kill three birds with one stone" improvement effect: lubrication toughening mechanical performance, reduction in secondary reflection pollution of electromagnetic wave, and improvement in the performance of photothermal conversion. After the introduction of MoS into binary MXene/ANF (mass ratio of 50:50), the strain to failure and tensile strength increase from 22.1 1.7% and 105.7 6.4 MPa and to 25.8 0.7% and 167.3 9.1 MPa, respectively. The toughness elevates from 13.0 4.1 to 26.3 0.8 MJ m (~ 102.3%) simultaneously. And the reflection shielding effectiveness (SE) of MXene/ANF (mass ratio of 50:50) decreases ~ 10.8%. EMI shielding effectiveness (EMI SE) elevates to 41.0 dB (8.2-12.4 GHz); After the introduction of MoS into binary MXene/ANF (mass ratio of 60:40), the strain to failure increases from 18.3 1.9% to 28.1 0.7% (~ 53.5%), the SE decreases ~ 22.2%, and the corresponding EMI SE is 43.9 dB. The MoS also leads to a more efficient photothermal conversion performance (~ 45 to ~ 55 °C). Additionally, MXene/ANF-MoS composite films exhibit excellent electric heating performance, quick temperature elevation (15 s), excellent cycle stability (2, 2.5, and 3 V), and long-term stability (2520 s). Combining with excellent mechanical performance with high MXene content, electric heating performance, and photothermal conversion performance, EMI shielding ternary MXene/ANF-MoS composite films could be applied in many industrial areas. This work broadens how to achieve a balance between mechanical properties and versatility of composites in the case of high-function fillers.
设计并制备具有低反射特性的高韧性电磁干扰（EMI）屏蔽复合薄膜是解决电磁污染问题的一项紧迫任务。通过将二硫化钼（MoS）引入二元MXene/芳纶纳米纤维（ANF）复合体系，制备出具有类珍珠层状结构的三元MXene/ANF-MoS复合薄膜。MoS的引入实现了令人瞩目的“一石三鸟”的改进效果：润滑增韧机械性能、减少电磁波的二次反射污染以及提高光热转换性能。在将MoS引入二元MXene/ANF（质量比为50:50）后，断裂应变和拉伸强度分别从22.1±1.7%和105.7±6.4MPa提高到25.8±0.7%和167.3±9.1MPa。韧性同时从13.0±4.1提高到26.3±0.8MJ m（约102.3%）。并且MXene/ANF（质量比为50:50）的反射屏蔽效能（SE）降低了约10.8%。电磁干扰屏蔽效能（EMI SE）提高到41.0dB（8.2 - 12.4GHz）；在将MoS引入二元MXene/ANF（质量比为60:40）后，断裂应变从18.3±1.9%增加到28.1±0.7%（约53.5%），SE降低了约22.2%，相应的EMI SE为43.9dB。MoS还带来了更高效的光热转换性能（约45至约55°C）。此外，MXene/ANF-MoS复合薄膜表现出优异的电加热性能、快速升温（15秒）、出色的循环稳定性（2、2.5和3V）以及长期稳定性（2520秒）。结合高MXene含量所具有的优异机械性能、电加热性能和光热转换性能，EMI屏蔽三元MXene/ANF-MoS复合薄膜可应用于许多工业领域。这项工作拓宽了在高功能填料情况下如何实现复合材料机械性能与多功能性之间的平衡。
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