Controlled fabrication of core-shell γ-Fe2O3@C-Reduced graphene oxide composites with tunable interfacial structure for highly efficient microwave absorption

Xin Kou; Yongpeng Zhao; Lijia Xu; Zhiliang Kang; Yuchao Wang; Zhiyong Zou; Peng Huang; Qianfeng Wang; Gehong Su; Ying Yang; YanMing Sun

doi:10.1016/j.jcis.2022.02.023

Controlled fabrication of core-shell γ-Fe₂O₃@C-Reduced graphene oxide composites with tunable interfacial structure for highly efficient microwave absorption

J Colloid Interface Sci. 2022 Jun:615:685-696. doi: 10.1016/j.jcis.2022.02.023. Epub 2022 Feb 9.

Authors

Xin Kou¹, Yongpeng Zhao², Lijia Xu³, Zhiliang Kang³, Yuchao Wang³, Zhiyong Zou³, Peng Huang³, Qianfeng Wang³, Gehong Su⁴, Ying Yang⁵, YanMing Sun⁶

Affiliations

¹ College of Mechanical and Electrical Engineering, Sichuan Agricultural University, Ya'an 625000, China; School of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
² College of Mechanical and Electrical Engineering, Sichuan Agricultural University, Ya'an 625000, China. Electronic address: zhaoyp@sicau.edu.cn.
³ College of Mechanical and Electrical Engineering, Sichuan Agricultural University, Ya'an 625000, China.
⁴ School of Science, Sichuan Agricultural University, Ya'an 625000, China.
⁵ School of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
⁶ Institute of Microscale Optoelectronics, Shenzhen University, 3688 Nanhai Boulevard, Shenzhen 518060, China.

PMID: 35168017
DOI: 10.1016/j.jcis.2022.02.023

Abstract

The design of a high-performance microwave absorbing material is highly dependent on the synergistic structural design of heterostructure and the appropriate material compositions. Herein, a series of composites of reduced graphene oxide (RGO) and core-shell structured γ-Fe₂O₃@C nanoparticles have been achieved by a hydrothermal and in-situ chemical vapor deposition (CVD) method. In particular, the structure of the carbon layer, including its graphitization and thickness, can be controlled by optimizing the CVD conditions, which is beneficial to tailor the impedance matching and dielectric loss. The rationally designed RGO/γ-Fe₂O₃@C composite has multiple electromagnetic dissipation mechanisms. The effective absorption ranges of an optimal sample at a filling rate of 20% can cover 100% X-band and 98% Ku-band at thicknesses of 3.0 mm and 2.2 mm, respectively. This finding suggested that the controllable fabrication of core-shell heterostructures could be viable approach to upgrade the microwave absorption performance of transition metal oxides.