Modification of Al/porous SiO2 composite films via Ag particles for infrared-visible compatible stealth

The advancement of infrared-visible compatible stealth materials is pivotal for strengthening national defense security and driving the next frontier in stealth material technologies. Here, we propose a modification strategy for Al/porous SiO 2 (Al/p-SiO 2 ) composite films by incorporating Ag particles to modulate their spectral response, thereby achieving infrared-visible compatible stealth. The most outstanding Al/p-SiO 2 /Ag-20 exhibits excellent thermal stability, with emissivity of 0.27 in the mid-wave infrared (3-5 μm) and 0.19 in the long-wave infrared (8-14 μm) bands. In addition, compared with Al/p-SiO 2 , its visible reflectivity is reduced by 0.35, reaching as low as 0.38 (380-780 nm). To meet diverse application requirements, flexible and patterned Al/p-SiO 2 /Ag-20 composite film was fabricated, exhibiting excellent stealth performance, particularly suitable for wearable devices and fabrics. It is worth mentioning that the fabrication of Al/p-SiO 2 /Ag composite films only requires a simple, low-cost and scalable process, which provides a solid foundation for large-scale application of infrared-visible compatible stealth materials.