Cheng Siyao, Sheng Daohu, Mukherjee Soumya, Dong Wei, Huang Yuanbiao, Cao Rong, Xie Aming, Fischer Roland A, Li Weijin
School of Safety Science and Engineering, Nanjing University of Science and Technology, Nanjing, PR China.
State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, PR China.
Nat Commun. 2024 Oct 21;15(1):9077. doi: 10.1038/s41467-024-53465-1.
Surface modulation strategies have spurred great interest with regard to regulating the morphology, dispersion and flexible processability of materials. Unsurprisingly, customized modulation of surfaces is primed to offer a route to control their electronic functions. To regulate electromagnetic wave (EMW) absorption applications by surface engineering is an unmet challenge. Thanks to pyrolyzing surface-anchored metal-porphyrin, here we report on the surface modulation of four-nitrogen atoms-confined single metal site on a nitrogen-doped carbon layer (sM(N)@NC, M = Ni, Co, Cu, Ni/Cu) (sM=single metal; NC= nitrogen-doped carbon layer) that registers electromagnetic wave absorption. Surface-anchored metal-porphyrins are afforded by attaching them onto the polypyrrole surface via a prototypical click reaction. Further, sM(N)@NC is experimentally found to elicit an identical dipole polarization loss mechanism, overcoming the handicaps of conductivity loss, defects, and interfacial polarization loss among the current EMW absorber models. Importantly, sM(N)@NC is found to exhibit an effective absorption bandwidth of 6.44 and reflection loss of -51.7 dB, preceding state-of-the-art carbon-based EMW absorbers. This study introduces a surface modulation strategy to design EMW absorbers based on single metal sites that enable fine-tunable and controlled absorption mechanism with atomistic precision.
表面调制策略在调节材料的形态、分散性和灵活的可加工性方面引起了极大的兴趣。不出所料，定制的表面调制有望提供一种控制其电子功能的途径。通过表面工程来调节电磁波（EMW）吸收应用是一项尚未解决的挑战。由于对表面锚定的金属卟啉进行热解，在此我们报道了在掺氮碳层（sM(N)@NC，M = Ni、Co、Cu、Ni/Cu）（sM = 单金属；NC = 掺氮碳层）上对四氮原子限制的单金属位点进行表面调制，该位点记录了电磁波吸收。通过典型的点击反应将表面锚定的金属卟啉附着到聚吡咯表面来制备。此外，实验发现sM(N)@NC引发相同的偶极极化损耗机制，克服了当前EMW吸收体模型中存在的电导率损耗、缺陷和界面极化损耗等障碍。重要的是，发现sM(N)@NC表现出6.44的有效吸收带宽和-51.7 dB的反射损耗，优于目前最先进的碳基EMW吸收体。本研究引入了一种表面调制策略，以设计基于单金属位点的EMW吸收体，该吸收体能够以原子精度实现精细可调且可控的吸收机制。
