Photosynthesis‐Inspired Nano‐Bionic Leaf for Broadband Microwave Energy Absorption

ABSTRACT

Inspired by the light‐management mechanism of photosynthetic leaves, we develop a nano‐bionic leaf‐like absorber for broadband microwave energy absorption. In situ pyrolysis of a metal‐organic coordination polymer gel produces a multigradient heterostructure composed of a dense graphitic carbon outer layer and a mesophyll‐like interior containing dispersed carbon spheres and phosphate nanosheets. This leaf‐mimetic nanoarchitecture enables progressive microwave energy regulation by combining front‐surface impedance matching with internal multiple scattering, interfacial polarization, conductive loss, and dielectric‐magnetic dissipation. The optimized absorber achieves a maximum effective absorption bandwidth of 6.66 GHz, a minimum reflection loss of −49.6 dB, and a low matching thickness of 1.89 mm. Field simulations further reveal spatially differentiated energy dissipation, with electric‐field localization in the carbon phase and magnetic‐field localization in the phosphate phase. This work provides a biomimetic strategy for designing nanoarchitectured absorbers for thin and broadband microwave energy absorption.