Single‐Atom Nanozyme‐Like Lanthanum Moieties for High‐Performance Electromagnetic Energy Absorption

作者：Yanan Shi, Ziqian Ma, Xiao Zhang, Zheng Ma, Feng Yan, Chunling Zhu, Yujin Chen · 发表于：Advanced Functional Materials · 年份：2024 · DOI：10.1002/adfm.202403508 · 被引用次数：54 · 研究领域：Advanced Nanomaterials in Catalysis、MXene and MAX Phase Materials、Carbon and Quantum Dots Applications

Abstract Single‐atom (SA) nanozymes have unprecedented physicochemical performance due to their integrated merits of both atomically dispersed metal atoms and bio‐enzymes. However, the structure‐function relationship between the SA nanozyme‐like structure and its dielectric performance is still unclear. Furthermore, controllable synthesis of SA nanozyme‐like structures remains challenging due to their unique five‐coordinated configurations. Here, a dicyandiamide‐mediated pyrolysis strategy is proposed to anchor five nitrogen‐coordinated lanthanum (La)–N 5 moieties on interconnected N‐doped graphene nanocages (La‐N 5 /ING). Theoretical predictions indicate that the spatially coordinated La–N 5 moieties exhibit significantly enhanced conduction loss and polarization loss compared to La–N 4 moieties, as evidenced by the experimental results. Moreover, the polydimethylsiloxane‐coated chemically cross‐linked film constructed by the La‐N 5 /ING and aramid nanofibers has outstanding electromagnetic wave (EMW) absorption performance with an effective absorption bandwidth (EAB 10 ) of 6.24 GHz at a thickness of merely 2.0 mm, outperforming those of most reported carbon‐based films. Importantly, the film also has excellent flexibility, hydrophobicity, mechanical strength, and structural stability, ensuring its application potential in practical environments. These findings provide crucial insights into the microscopic environment of SA on the dielectric properties of their host materia...