The development of Ti_(3)C_(2)Tx MXene-based electromagnetic wave-absorbing materials faces a persistent challenge in balancing conductivity loss and polarization relaxation.To resolve this conflict,we propose an“int...The development of Ti_(3)C_(2)Tx MXene-based electromagnetic wave-absorbing materials faces a persistent challenge in balancing conductivity loss and polarization relaxation.To resolve this conflict,we propose an“interface engineering–human–computer interaction(HCI)”strategy to regulate the evolution of permittivity and decouple the interdependency between conductivity(σ)and relaxation time(τ).First,by integrating the Debye relaxation model and transmission line theory into Python-based interactive modules,an HCI framework is established that quantitatively guides the optimization of permittivity trends and provides feedback on intrinsic Debye-parameter variations.Guided by these theoretical optimizations,nitrogen-doped SiO_(2)-coated Ti_(3)C_(2)Cl_(x) MXene(SMX)composites were subsequently prepared via interface engineering.The insulating SiO_(2) layer suppresses excessiveσwhile introducing heterogeneous interfaces that prolongτ.Meanwhile,the surface heterogeneous dipole generated by nitrogen doping induces a hysteresis ofτ.Consequently,this theory-guided design enables the optimized SMX-S2-N1 to achieve a 5.2 GHz effective absorption bandwidth,overcoming the inherent limitation of narrow absorption bandwidth in MXene single-component materials.This study not only addresses the restricted absorption bandwidth of monolithic MXenes but also offers a mechanistic understanding of dielectric loss through Debye model analysis,bridging semiempirical design principles with theoretical frameworks.展开更多
基金supported by the National Natural Science Foundation of China(No.51872058)the Supporting Program for Innovation Team of Outstanding Youth in Colleges and Universities of Shandong Province(No.2020KJA005)the Natural Science Foundation of Shandong Province(No.ZR2022QB156).
文摘The development of Ti_(3)C_(2)Tx MXene-based electromagnetic wave-absorbing materials faces a persistent challenge in balancing conductivity loss and polarization relaxation.To resolve this conflict,we propose an“interface engineering–human–computer interaction(HCI)”strategy to regulate the evolution of permittivity and decouple the interdependency between conductivity(σ)and relaxation time(τ).First,by integrating the Debye relaxation model and transmission line theory into Python-based interactive modules,an HCI framework is established that quantitatively guides the optimization of permittivity trends and provides feedback on intrinsic Debye-parameter variations.Guided by these theoretical optimizations,nitrogen-doped SiO_(2)-coated Ti_(3)C_(2)Cl_(x) MXene(SMX)composites were subsequently prepared via interface engineering.The insulating SiO_(2) layer suppresses excessiveσwhile introducing heterogeneous interfaces that prolongτ.Meanwhile,the surface heterogeneous dipole generated by nitrogen doping induces a hysteresis ofτ.Consequently,this theory-guided design enables the optimized SMX-S2-N1 to achieve a 5.2 GHz effective absorption bandwidth,overcoming the inherent limitation of narrow absorption bandwidth in MXene single-component materials.This study not only addresses the restricted absorption bandwidth of monolithic MXenes but also offers a mechanistic understanding of dielectric loss through Debye model analysis,bridging semiempirical design principles with theoretical frameworks.
