Guo Yifan, Li Jinyang, Meng Fanbin, Wei Wei, Yang Qian, Li Ying, Wang Huagao, Peng Fuxi, Zhou Zuowan
Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering , Southwest Jiaotong University , Chengdu 610031 , P R China.
ACS Appl Mater Interfaces. 2019 May 8;11(18):17100-17107. doi: 10.1021/acsami.9b04498. Epub 2019 Apr 23.
An intercalation polymerization is applied to regulate the hybridizing structures of polyaniline@graphene (PANI@GE). Polarization of GE sheets is realized, which is attributed to the hybridization by the in situ intercalation-polymerized PANI molecules. The polarizing effect on GE is confirmed by characterizations and density functional theory calculations, and the results indicate that distinct p-π and π-π interactions exist between the PANI molecules and the GE sheets. As a result, this new structural hybrid leads to a high performance of microwave absorption. The minimum reflection loss (RL) of the optimized PANI@GE hybrid can be as low as -64.3 dB at 10.1 GHz with the RL bandwidth of -10 dB being 5.1 GHz (from 8.6 to 13.7 GHz). A further study reveals a special mechanism for the electromagnetic energy consumptions by the structural resonance of the polarized GE-based hybrids, a complex macromolecule. In addition, the fully separated GE provides a good impedance matching, together with the widely held multiscaled relaxations of the interfacial polarization.
采用插层聚合方法调控聚苯胺@石墨烯（PANI@GE）的杂化结构。实现了石墨烯片层的极化，这归因于原位插层聚合的聚苯胺分子的杂化作用。通过表征和密度泛函理论计算证实了对石墨烯的极化作用，结果表明聚苯胺分子与石墨烯片层之间存在明显的p-π和π-π相互作用。因此，这种新型结构杂化物具有高性能的微波吸收性能。优化后的PANI@GE杂化物的最小反射损耗（RL）在10.1 GHz时可低至-64.3 dB，RL带宽为-10 dB时为5.1 GHz（从8.6到13.7 GHz）。进一步的研究揭示了一种基于极化石墨烯的杂化物（一种复杂大分子）结构共振导致电磁能耗的特殊机制。此外，完全分离的石墨烯提供了良好的阻抗匹配，以及广泛存在的界面极化多尺度弛豫。
