Nanoarchitectonics of integrated impedance gradient MXene/PPy/polyester composite fabric for enhanced microwave absorption performances

Different from the traditional layer-layer impedance gradient materials, in this work, integrated impedance gradient composite fabric (MP-IIGF) was constructed by using PET spacer fabric as matrix, MXene as conductive filler and polypyrrole as impedance regulator. The collaborative design of continuous impedance gradient structure and composite absorber not only enables the material to absorb microwave, but also makes the composites have the potential of infrared stealth brought by thermal insulation. MP-IIGF-2 has the reflection loss of −27.96 dB at 8.04 GHz, and the effective absorption bandwidth covers the entire X-band. The continuous impedance gradient distribution is realized in the thickness direction of the fabric, which solves the problems of the existence of air medium, easy separation and impedance stepping between the layers of traditional multilayer microwave absorption materials. Therefore, this work provides a new design direction for the research and development of flexible and broadband microwave absorbing materials.