Li Dan-Yang, Liu Liu-Xin, Wang Qi-Wei, Zhang Hao-Bin, Chen Wei, Yin Guang, Yu Zhong-Zhen
Beijing Key Laboratory of Advanced Functional Polymer Composites, Beijing University of Chemical Technology, Beijing 100029, China.
State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
ACS Appl Mater Interfaces. 2022 Mar 16;14(10):12703-12712. doi: 10.1021/acsami.2c00797. Epub 2022 Mar 1.
Although two-dimensional transition-metal carbides (MXenes) and intrinsic conductive polymers have been combined to produce functional electromagnetic interference (EMI) shielding composites, acid/alkali-responsive EMI shielding textiles have not been reported. Herein, electrically conductive polyaniline (PANI)/MXene/cotton fabrics (PMCFs) are fabricated by an efficient vacuum filtration-assisted spray-coating method for acid/alkali-responsive and tunable EMI shielding applications on the basis of the high electrical conductivity of MXene sheets and the acid/alkali doping/de-doping feature of PANI nanowires. The as-prepared PMCF exhibits a sensitive ammonia response of 19.6% at an ammonia concentration of 200 ppm. The high EMI shielding efficiency of ∼54 dB is achieved by optimizing the decorated structure of the PANI/MXene coating on the cotton fabrics. More importantly, the PMCF can act adaptively as a "switch" for EMI shielding between the efficient strong shielding of 24 dB and the inefficient weak shielding of 15 dB driven by the stimulation of hydrogen chloride and ammonia vapors. This multifunctional fabric would possess promising applications for intelligent garments, flexible electronic sensors, and smart electromagnetic wave response in special environments.
尽管二维过渡金属碳化物（MXenes）与本征导电聚合物已被结合用于制备功能性电磁干扰（EMI）屏蔽复合材料，但酸/碱响应型EMI屏蔽纺织品尚未见报道。在此，基于MXene片层的高导电性和聚苯胺（PANI）纳米线的酸/碱掺杂/去掺杂特性，通过高效的真空过滤辅助喷涂法制备了用于酸/碱响应及可调谐EMI屏蔽应用的导电聚苯胺（PANI）/MXene/棉织物（PMCFs）。所制备的PMCF在200 ppm氨浓度下表现出19.6%的灵敏氨响应。通过优化棉织物上PANI/MXene涂层的修饰结构，实现了约54 dB的高EMI屏蔽效率。更重要的是，在氯化氢和氨蒸气的刺激下，PMCF能够自适应地充当EMI屏蔽的“开关”，在24 dB的高效强屏蔽和15 dB的低效弱屏蔽之间切换。这种多功能织物在智能服装、柔性电子传感器以及特殊环境中的智能电磁波响应方面具有广阔的应用前景。
