Large-Scale Nanofiber Manufacturing| Self-catalyzed growth ofCo-N codopedcarbon nanotubes for advanced multi-heterointerface engineeringin hierarchicalcarbonaceous microwave absorbers

Adv. Compos. Hybrid Mater. (IF 23.2): Self-Catalytic Growth of Co-N Co-Doped Carbon Nanotubes for Hierarchical Carbon-Based Microwave Absorbers

Background: In recent years, rational construction of hierarchical multi-heterojunction microstructures has become an attractive strategy to obtain lightweight, high-performance metal-organic framework (MOF)-based electromagnetic wave (EMW) absorbing materials.

Approach: The team led by Academician Chang-Yu Shen and Professor Chun-Tai Liu at Zhengzhou University, including Hu Liu et al., prepared hierarchical MOF-derived Co-N co-doped carbon nanotube-modified carbon foam (Co-NC@CF) with multi-interfaces by in-situ growth of ZIF-67 MOF nanosheets on 3D melamine foam (MF) followed by pyrolysis-induced self-catalytic processes.

Innovation 1: Beyond the dielectric-magnetic dual-loss synergy, the hierarchical heterostructure and porous architecture of Co-NC@CF demonstrate optimized impedance matching, multi-polarization loss, and multiple reflection/scattering. Moreover, N-doping and defects critically enhance interface/dipole polarization, boosting EMW dissipation.

Innovation 2: Tuning pyrolysis temperature for self-catalytic Co-N-CNT growth effectively regulates EMW absorption. Co-NC@CF-800 achieves peak performance at 14.96 GHz with -58.4 dB reflection loss at merely 2.25 mm thickness.

DOI: https://doi.org/10.1007/s42114-024-01209-6