物理化学学报2026，Vol.42Issue(6)：170-182,13.DOI:10.1016/j.actphy.2026.100285
聚酰亚胺衍生多孔碳纳米片中的协同分子组装与阻抗匹配及其微波吸收性能研究
Synergistic molecular assembly and impedance matching in polyimide-derived porous carbon nanosheets for advanced microwave absorption
摘要
Abstract
Herein,a novel strategy for fabricating microwave absorption materials via molecular-level design that synergistically regulates dielectric and magnetic losses.The method utilizes a polyimide precursor containing both carboxyl and benzimidazole functional groups as the key component.Through an ice-templating process followed by in-situ ion exchange,Ni²⁺ ions are uniformly incorporated into the polymeric skeleton.Subsequent thermal imidization and carbonization yield nitrogen-doped two-dimensional carbon nanosheets embedded with uniformly dispersed Ni/NiO nanoparticles(BPCN@Ni/NiO).This material exhibits significantly superior microwave absorption properties compared to its counterpart synthesized without the benzimidazole structure(NPCN@Ni/NiO).BPCN@Ni/NiO achieves a remarkable minimum reflection loss(RLmin)of-69.02 dB with effective absorption bandwidth(EAB)of 8.92 GHz(8.28-17.2 GHz).Microstructural analyses confirm its three-dimensional interconnected nanosheet architecture,highly dispersed Ni/NiO species,and homogeneous elemental distribution.The performance enhancement is attributed to the synergistic complexation of Ni2+ions by benzimidazole and carboxyl groups,which enables efficient loading and uniform dispersion of nickel species,thereby optimizing impedance matching.Furthermore,the unique 2D conductive network,abundant heterogeneous interfaces(C/Ni/NiO),defect-induced dipole polarization,and magnetic coupling between Ni and NiO collectively contribute to synergistic multiple loss mechanisms,ultimately endowing the material with excellent microwave attenuation capability.This work offers a new pathway for designing lightweight,efficient,and broadband carbon-based composite absorbers through precise molecular engineering.关键词
微波吸收/苯并咪唑聚酰亚胺/碳纳米片/镍纳米颗粒/异质界面Key words
Microwave absorption/Benzimidazole polyimide/Carbon nanosheets/Nickel nanoparticles/Heterogeneous interface分类
化学化工引用本文复制引用
梁博,赵禹一健,王思雨,黄诗涵,周方科,张传坤,王越,果小明..聚酰亚胺衍生多孔碳纳米片中的协同分子组装与阻抗匹配及其微波吸收性能研究[J].物理化学学报,2026,42(6):170-182,13.基金项目
本研究由湖北汽车工业学院博士科研启动基金(BK202411、BK202219)资助.作者感谢湖北汽车工业学院分析测试中心提供的技术支持. （BK202411、BK202219）
