Sprayed AgNWs interfacial engineering enabling hyperspectral-infrared compatible camouflage in biomimetic bilayer...

Most research on hyperspectral camouflage focuses on green vegetation, lacking hyperspectral camouflage for complex environments and infrared camouflage. This study prepared a coating using Alizarin Green (AG), Acid Yellow (AY), magnesium‑aluminum layered double hydroxides (MgAl LDHs), and lithium chloride (LiCl). The coating exhibits high color consistency with dark green, medium green, yellow green, and yellow leaves. Through ion exchange and electrostatic adsorption, SO2-3 in AG and AY replace the CO2-3 between the layers of MgAl LDHs and bind to positively charged laminate surfaces. This enables simulation of diverse leaf coloration and accurate replication of "green peak" and "red edge" variations. Strong interaction between "Li⁺" and polyurethane (PU) polar groups, coupled with electrostatic attraction of polar water molecules, generates a porous internal structure that mimics the "near-infrared plateau" and "water absorption peak". The spectral cosine values of the coating are as high as 0.956, 0.969, 0.971, and 0.988. By spraying silver nanowires (AgNWs) on the surface of the hyperspectral camouflage coating forms a conductive network enabling hyperspectral-infrared compatible camouflage. Furthermore, by adjusting the number of layers of AgNWs, the gradient adjustment of the emissivity (0.88-0.48) is achieved, realizing the hyperspectral-infrared compatible camouflage performance in different environments.