Multi‐Interfaces Regulated Polyaniline/Nano‐Fe₃O₄/Graphene Ternary Hybrids for Ultra‐Broadband Electromagnetic Absorption

Abstract

Graphene‐based electromagnetic absorbing materials have attracted growing attention, due to their great absorption efficiency and light weight. One common design principle is to load magnetic particles onto graphene. However, the agglomeration of magnetic nanoparticles on the graphene sheets limits further improvement in their electromagnetic absorption performances. In this work, polyaniline/nano‐Fe3O4/graphene ternary hybrids with regulated multi‐interfaces are designed by simply adjusting the adding order of graphene. The dispersion of nano‐Fe3O4 on graphene and the interactions among the ternary interfaces are synchronously controlled, which are considered to be the key factors restricting the hybrids’ performances. The polyaniline/nano‐Fe3O4/graphene ternary composites show ultra‐broadband electromagnetic absorption, with the optimal reflection loss peak reaching −57.2 dB at 11.4 GHz, and the effective bandwidth achieves 13.2 GHz, covering 4.8–18 GHz. It is found that the well dispersion of nano‐Fe3O4 can enhance the overall ferromagnetism and magnetic losses, while the modulation of the multi‐interfaces can further ameliorate the interfacial and dipole polarization, synergistically making the ultra‐broadband electromagnetic absorption. This work provides areferencing path for the design of subsequent multi‐interfacing electromagnetic absorbing materials.

EVA copolymer loaded with PAni/CNT/GNP hybrids: A flexible and lightweight material with high microwave absorption

“…26,36,56 The combination of PAni, GNP, and CNT can create a network with a 3-dimensional (3-D) hybrid structure with increased contact area and interaction among the components. 57 This feature was observed in SEM images and may also be responsible for the improved conductivity, as discussed before. Among the composites with ternary PAni/CNT/GNP hybrids with CNT/GNP (0.3:0.7) presented the lowest RL value (À40.55 dB at 16.31 GHz) but relatively narrow absorption bandwidth.…”

Diethylenetriamine-functionalized reduced graphene oxide having more amino groups for methylene blue removal

“…For example, the Chen group prepared polyaniline/nano-Fe 3 O 4 /graphene composites, which displayed a broad band of electromagnetic wave absorption. 6 The amino group was directly attached to the graphene sheet through the commonly used reaction between the carboxylic acid of GO and the amino group of other compounds. The products or composites possessed excellent properties.…”