Chen Congjie, Shan Zhen, Li Bocong, Wang Jinjian, Liu Tongtong, Li Shu-Fan, Yang Hongwei, Su Jian, Zhang Gen
Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China.
Small. 2025 Feb;21(5):e2409786. doi: 10.1002/smll.202409786. Epub 2024 Dec 17.
The growing threat of electromagnetic pollution has become a pressing safety concern. Metal-organic framework (MOF) derivatives are considered ideal candidates for mitigating electromagnetic radiation. However, due to the limitations imposed by complex post-processing and disruption of pristine crystal structures, the mechanisms of electromagnetic wave absorption remain unclear, let alone achieving atomic-level regulation in MOF derivatives. Moreover, research on MOF-based electromagnetic wave absorbers (EMWA) has predominantly focused on 2D and 3D structures, leaving 1D MOFs largely unexplored. To address these challenges, a bottom-up polarization gene weaving strategy is proposed to integrate polarizable conjugated groups, thieno(3,2-b)thiophene (TBTT), into two types of conductive MOFs by fine-tuning self-assembly conditions. As expected, both MOFs exhibited strong natural polarization effects. Among them, the 1D linear coordination mode of CuTBTT-1D demonstrated enhanced charge carrier mobility and geometric effects compared to the 2D structure, CuTBTT-2D. The synthesized 1D molecular polarization wire, with a thickness of 2.2 mm, achieved ultra-high reflection loss (-77 dB) and super-wide absorption bandwidth (6.52 GHz). Its performance surpasses that of all known MOF-based EMWAs. This study provides a valuable strategy for the rational design of next-generation 1D MOF EMWA with atomic precision.
电磁污染日益增长的威胁已成为一个紧迫的安全问题。金属有机框架（MOF）衍生物被认为是减轻电磁辐射的理想候选材料。然而，由于复杂的后处理带来的限制以及原始晶体结构的破坏，电磁波吸收机制仍不明确，更不用说在MOF衍生物中实现原子级调控了。此外，基于MOF的电磁波吸收体（EMWA）的研究主要集中在二维和三维结构上，一维MOF在很大程度上尚未得到探索。为应对这些挑战，提出了一种自下而上的极化基因编织策略，通过微调自组装条件，将可极化共轭基团噻吩并[3,2-b]噻吩（TBTT）整合到两种类型的导电MOF中。不出所料，两种MOF都表现出强烈的自然极化效应。其中，与二维结构的CuTBTT-2D相比，CuTBTT-1D的一维线性配位模式表现出增强的载流子迁移率和几何效应。合成的厚度为2.2毫米的一维分子极化线实现了超高反射损耗（-77 dB）和超宽吸收带宽（6.52 GHz）。其性能超过了所有已知的基于MOF的EMWA。这项研究为合理设计具有原子精度的下一代一维MOF EMWA提供了有价值的策略。
