Multi-interfacial engineering in the hierarchical self-assembled micro-nano dielectric aerogel for wide-band absorption and low infrared emissivity

Radar-infrared (IR) compatible stealth can satisfy the characteristics of excellent electromagnetic wave attenu-ation property and low infrared emissivity. However, concurrently satisfying these demands is still a great challenge at present. Herein, multi-interfacial engineering strategy was proposed for the preparation of radar-IR compatible stealth materials. ZnO has a high electron binding energy and a large band gap at room temperature, and doping with sulphide can increase the concentration of unconstrained carriers. Therefore, bimetallic sul-phide aerogels loaded with ZnO were prepared by means of carbonization and vulcanization, combined with freeze-drying method. When the filling ratio is 20 %, an absorption bandwidth (fe) of 6.62 GHz at a matching thickness of 2.0 mm and a reduction in IR emissivity from 0.920 to 0.539 in the 8-14 & mu;m band are achieved. This work provides a guidance to design and synthesize high-performance absorbers by multi-interfacial engineering for IR-radar compatible stealth application.

Automated summary

A multi-interfacial engineering strategy was proposed for the preparation of radar-IR compatible stealth materials. Bimetallic sulphide aerogels loaded with ZnO were prepared by carbonization, vulcanization, and freeze-drying. The materials achieved an absorption bandwidth of 6.62 GHz and a reduction in IR emissivity in the 8-14 μm band. This work provides guidance for the design and synthesis of high-performance absorbers for IR-radar compatible stealth application.