Synergistic Hollow Structure Design and Defect Engineering in Dandelion-Like α-MnO₂ for Superior Radar-Infrared...

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Developing multispectral stealth technologies requires materials compatible with both radar and infrared detection.
• Achieving high-performance compatible stealth in a single integrated coating presents a significant challenge.

Purpose of the Study:

• To design and evaluate a novel ion-modulated α-MnO2 with a dandelion-like hollow structure as a filler for single-layer stealth coatings.
• To achieve superior radar-infrared compatible stealth properties by addressing the incompatibility of conventional thermal insulation coatings.

Main Methods:

• Synthesized ion-modulated α-MnO2 with a unique hollow structure using epoxy resin as a binder.
• Investigated the synergistic effects of multitiered hollowness and defects from low-valence cation doping on material properties.
• Characterized the broadband microwave absorption and thermal conductivity of the resulting coating.

Main Results:

• The developed coating demonstrated remarkable broadband microwave absorption (RL<-10 dB) over 8.9 GHz, covering X/Ku bands.
• Significantly reduced thermal conductivity from 0.59 to 0.31 W m⁻¹ K⁻¹, visually suppressing thermal radiation.
• Attributed performance enhancements to synergistic effects of hollowness and doping-induced defects enhancing polarization loss and reducing thermal conductivity.

Conclusions:

• The ion-modulated α-MnO2 filler provides a significant solution for radar-infrared compatible stealth in single-layer coatings.
• This work offers a new strategy for developing advanced multispectral stealth materials.
• The material design overcomes the inherent limitations of conventional thermal insulation coatings for stealth applications.