Reconstructing 2D MXene into 1D length-tunable aminofunctionalized periodic mesoporous organosilica@MXene/Ni structures for enhanced microwave absorption performance

The application of two-dimensional (2D) MXene nanomaterials in microwave absorption is severely limited due to their excessive conductive pathways caused by self-stacking and an inherent lack of magnetic loss. In this work, we developed length-tunable NPMO@MXene/Ni (PMNi) hybrids through dimensionality engineering and electrostatic self-assembly, converting the structure of MXene from 2D to one-dimensional (1D) configuration and loading them with magnetic nickel (Ni) nanosheets. The hollow, mesoporous structure of the aminofunctionalized periodic mesoporous organosilica (NPMO) matrix and the three-tier hierarchical structure of PMNi generated numerous heterogeneous interfaces, greatly enhancing interfacial polarization and dielectric loss capabilities. Furthermore, the overall electromagnetic parameters were optimized for impedance matching by regulating the NPMO microrod length. The experimental results and radar cross-section simulations revealed that all PMNi magnetic hybrids demonstrated impressive microwave absorption characteristics. Specifically, mainly depending on "2D-to-1D" dimensional reconstruction strategy, the PMNi-600 exhibited an impressive minimum reflection loss of -51.28 dB at a thickness of only 1.7 mm, with an effective absorption bandwidth of 5.16 GHz. This work presents a novel approach to enhance the microwave absorption performance of MXene-based materials through dimensional reconstruction strategy.