MXene-based multilayered composite films show great promise in electromagnetic interference(EMI)shielding field,but the trade-off between mechanical properties,oxidation resistance and EMI shielding performance remain...MXene-based multilayered composite films show great promise in electromagnetic interference(EMI)shielding field,but the trade-off between mechanical properties,oxidation resistance and EMI shielding performance remains a huge challenge.Herein,inspired by the architecture of millefeuille,alternating multilayered MXene/carbon nanotube(CNT)films were successfully prepared using an alternating vacuum-assisted filtration method,in which the alternating CNT layers not only act as the mechanical frame and oxidation barrier,but also synergistically enhance the EMI shielding effect of MXene layers through the distinctive“absorption-reflection-reabsorption”mechanism.By optimizing the alternating multilayered structure,the MXene/CNT film with a thickness of 36µm can achieve a remarkable EMI shielding effectiveness(SE)of 81.4 dB across the frequency range of 8.2–26.5 GHz.Meanwhile,the mechanical strength and toughness of the MXene/CNT film reach 83.4 MPa and 7.20 MJ/m^(3),respectively.Moreover,the CNT layer can effectively isolate MXene layer from oxygen,thus enabling the fire/oxidation resistance of the multilayer film in complex environments.Besides,the multilayered composite film exhibits impressive Joule heating capacity,which can reach 237℃within 10 s at an applied voltage of only 2.0 V.Therefore,the alternating multilayered MXene/CNT film breaks through the performance balance limit,showing a great prospect for the future.展开更多
基金supported by the National Natural Science Foundation of China(52303113 and 52273085)the Key Scientific Projects of Colleges and Universities in Henan Province of China(24A430045)the Key Research and Development Project of Henan Province of China(241111232300).
文摘MXene-based multilayered composite films show great promise in electromagnetic interference(EMI)shielding field,but the trade-off between mechanical properties,oxidation resistance and EMI shielding performance remains a huge challenge.Herein,inspired by the architecture of millefeuille,alternating multilayered MXene/carbon nanotube(CNT)films were successfully prepared using an alternating vacuum-assisted filtration method,in which the alternating CNT layers not only act as the mechanical frame and oxidation barrier,but also synergistically enhance the EMI shielding effect of MXene layers through the distinctive“absorption-reflection-reabsorption”mechanism.By optimizing the alternating multilayered structure,the MXene/CNT film with a thickness of 36µm can achieve a remarkable EMI shielding effectiveness(SE)of 81.4 dB across the frequency range of 8.2–26.5 GHz.Meanwhile,the mechanical strength and toughness of the MXene/CNT film reach 83.4 MPa and 7.20 MJ/m^(3),respectively.Moreover,the CNT layer can effectively isolate MXene layer from oxygen,thus enabling the fire/oxidation resistance of the multilayer film in complex environments.Besides,the multilayered composite film exhibits impressive Joule heating capacity,which can reach 237℃within 10 s at an applied voltage of only 2.0 V.Therefore,the alternating multilayered MXene/CNT film breaks through the performance balance limit,showing a great prospect for the future.
