MXene@c-MWCNT Adhesive Silica Nanofiber Membranes Enhancing Electromagnetic Interference Shielding and Thermal Insulation Performance in Extreme Environments

A lightweight flexible thermally stable composite is fabricated by combining silica nanofiber membranes（SNM） with MXene@c-MWCNT hybrid film.The flexible SNM with outstanding thermal insulation are prepared from tetraethyl orthosilicate hydrolysis and condensation by electrospinning and high-temperature calcination;the MXene@c-MWCNT x:y films are prepared by vacuum filtration technology.In particular,the SNM and MXene@c-MWCNT 6:4 as one unit layer（SMC 1 ） are bonded together with 5 wt%polyvinyl alcohol（PVA） solution,which exhibits low thermal conductivity(0.066 W m -1 K -1 ) and good electromagnetic interference（EMI） shielding performance（average EMI SE T ,37.8 dB）.With the increase in functional unit layer,the overall thermal insulation performance of the whole composite film（SMC x ） remains stable,and EMI shielding performance is greatly improved,especially for SMC 3 with three unit layers,the average EMI SE T is as high as 55.4 dB.In addition,the organic combination of rigid SNM and tough MXene@c-MWCNT 6:4 makes SMC x exhibit good mechanical tensile strength.Importantly,SMC x exhibit stable EMI shielding and excellent thermal insulation even in extreme heat and cold environment.Therefore,this work provides a novel design idea and important reference value for EMI shielding and thermal insulation components used in extreme environmental protection equipment in the future.