ABSTRACT Plant growth in nature is highly dependent on sunlight. Plants grown under low‐light conditions often exhibit leaf yellowing. This phenomenon occurs because Fe 3+ is reduced to Fe 2+ under ultraviolet light, and a deficiency of Fe 2+ impairs the ability to synthesize sufficient chlorophyll, ultimately affecting growth. Inspired by the photoreduction of ferric ions that promotes growth in plants, we propose a novel strategy for fabricating dual‐network materials. This approach utilizes coordination between Fe 3+ and carboxyl groups to construct the first network, followed by ferric ion photoreduction to promote the growth of the second network. Through this method, we achieve a significant enhancement in mechanical properties, increasing the fracture stress from the initial 1.50 to 29.38 MPa after modification. Furthermore, by employing selective irradiation, we explore the optical applications of the material, enabling rewritable patterning, water‐responsive actuation, 2D‐to‐3D shape transformation, and the preparation of anisotropic materials. This work holds considerable application potential in fields such as smart actuators and information storage.
Chen et al. (Tue,) studied this question.