Assembling Nano–Microarchitecture for Electromagnetic Absorbers and Smart Devices

Abstract Smart devices, nowadays, are inspiring the infinite vitality and possibilities of intelligent life, such as self‐power electromagnetic (EM) nanogenerator and microsensor, smart window, thermally‐driven EM absorber, interstellar energy deliverer, and so on. Herein, the latest and most impressive works of 3D nano–micro architectures and their smart EM devices are highly focused on. The most key information, including assembly strategy and mechanism, EM response, and approach‐structure‐function relationship, is extracted and well‐organized with profundity and easy‐to‐understand approach. The merit and demerit are revealed by comparison. What’s more, the brightest and most cutting‐edge smart EM devices constructed by 3D nano–micro architectures are reported as highlights, and the device principles are deeply dissected. Finally, a profound and top comment on the fast‐growing field as well as challenges are proposed, and the future directions are predicted intelligently.