Dynamic Atomic Polarization Engineering via Nanoconfinement for Adaptive Camouflage: Microwave to Infrared

ABSTRACT Actively tunable stealth protection has emerged as crucial for coping with variable electromagnetic radiation environments. However, the development of multi‐band compatible stealth materials that can withstand harsh real‐world service conditions remains a long‐standing bottleneck. This study presents a synergistic engineering approach combining aramid nanofiber assembly dynamics and crystallization thermodynamics of confined carbonization, which affords non‐oriented network structures that exhibit a high degree of isotropy, and remain insusceptible to structural distortion induced by ice crystal growth. The nano‐confinement effect occurring on the fiber surface effectively suppresses interlayer stacking of sp 2 ‐hybridized nanodomains while promoting massive formation of sp 2 –sp 3 polar bonds, realizing a synergistic enhancement of high‐temperature thermal stability up to 1000 K and long‐term mechanical cycling reliability. The as‐obtained material achieves actively reversible tuning of microwave absorption bandwidth covering 5.87–18 GHz, together with a 7.8°C tunable apparent temperature window in the thermal infrared band. This combination of cross‐band dynamic modulation capability provides excellent technical support for the development of all‐weather, all‐terrain camouflage systems for both personnel and military/civilian equipment.