Synthesis of Chlorophylls‐Doped Guanine Crystals with High Reflection and Depolarization for Green Camouflage Coating

Abstract

Hyperspectral imaging technology can record the spatial and spectral information of the targets and significantly enhance the levels of military reconnaissance and target detection. It has scientific importance to mimic “homochromatic and homospectral”camouflage materials of green vegetation. It is a big challenge to exquisitely simulate the spectral of green vegetation in visible and near‐infrared windows because of the slight differences between the artificial green dyes and vegetation, the instability of chlorophylls. Herein, a novel kind of biomimetic material of green vegetation was designed through the incorporation of chlorophylls into the crystal lattices of single‐crystalline anhydrous guanine microplates for the first time. The synthesized chlorophylls‐doped anhydrous guanine crystals exhibit high reflectance intensity and depolarization effect, thus can be applied as biomimetic camouflage materials that mimic green vegetation in the visible and near‐infrared regions. The factors influencing the formation of dye‐doped organic crystals under mild conditions were thoroughly investigated and the characterizations using electron microscopies clearly confirm the occlusion of chlorophylls into the crystal lattices of guanine crystals. The thermal stability experiments clearly indicate that the chlorophylls‐doped guanine crystals possess long‐term stability at high temperatures. This study provides a new strategy for the synthesis of multifunctional materials comprised of organic crystals.