Novel Three-Dimensional Graphene-Like Networks Loaded with Fe3O4 Nanoparticles for Efficient Microwave Absorption.

Tao Shang,Jianjun Zhao,Ningyu Ren,Qingshan Lu,Yuehou Yun,Yanli Qin,Guohong Yun,Luomeng Chao

doi:10.3390/nano11061444

Abstract

A novel three-dimensional graphene-like networks material (3D-GLN) exhibiting the hierarchical porous structure was fabricated with a large-scale preparation method by employing an ion exchange resin as a carbon precursor. 3D-GLN was first studied as the effective microwave absorbing material. As indicated from the results of the electromagnetic parameter tests, and the minimum reflection loss (RL) of the 3D-GLN reached −34.75 dB at the frequency of 11.7 GHz. To enhance the absorption performance of the nonmagnetic 3D-GLN, the magnetic Fe3O4 nanoparticles were loaded on the surface of the 3D-GLN by using the hydrothermal method to develop the 3D-GLN/Fe3O4 hybrid. The hybrid exhibited the prominent absorbing properties. Under the matching thickness of 3.0 mm, the minimum RL value of hybrid reached −46.8 dB at 11.8 GHz. In addition, under the thickness range of 2.0–5.5 mm, the effective absorption bandwidth (RL < 10 dB) was 13.0 GHz, which covered part of the C-band and the entire X-band, as well as the entire Ku-band. The significant microwave absorption could be attributed to the special 3D network structure exhibited by the hybrid and the synergistic effect exerted by the graphene and the Fe3O4 nanoparticles. As revealed from the results, the 3D-GLN/Fe3O4 hybrid could be a novel microwave absorber with promising applications.

Highlights

As the information technology and the electronics industry have been leaping forward, the electromagnetic (EM) wave is being more extensively employed
It was indicated that the crystal structure of the 3D-GLN was not destroyed in the process of the hydrothermal synthesis of the 3D-GLN/Fe3 O4, and the face-centered cubic structure Fe3 O4 could be successfully synthesized by using the hydrothermal method in the presence of the 3D-GLN
A novel low-density carbon material 3D-GLN was prepared with a large-scale method by employing the metal ion-exchange resin as a precursor

Summary

Introduction

As the information technology and the electronics industry have been leaping forward, the electromagnetic (EM) wave is being more extensively employed. The widespread use of electromagnetic waves can cause EM interference and reduce the stability of informationbased communications. The study of microwave-absorbing materials has aroused widespread attention, and the development of a low-density, thin-thickness, widebandwidth, and high-absorption absorbing material has always been a research hotspot. As a two-dimensional carbon material, is acting as a potential microwave absorber for its special physical properties of low density, high specific surface area and moderate dielectric loss [2,3]. The design of the graphene with special structures (e.g., 3D graphene) was able to improve the microwave absorption capacity of graphene [3,5,6]. The self-assembly method and the template-oriented method were employed to prepare the 3D

Methods

Results

Conclusion