Vapor diffusion synthesis of rugby-shaped CoFe sub(2)O sub(4)/graphene composites as absorbing materials

• Published in: Journal of alloys and compounds Vol. 630; pp. 195 - 201
• Main Authors: Zhang, Shenli, Jiao, Qingze, Hu, Ju, Li, Jingjing, Zhao, Yun, Li, Hansheng, Wu, Qin
• Format: Journal Article
• Language: English
• Published: 05.05.2015
• Subjects: Absorption; Alloys; Analyzers; Diffusion; Field emission; Graphene; Networks; Noise levels; X-rays
• ISSN: 0925-8388
• DOI: 10.1016/j.jallcom.2015.01.037

Rugby-shaped CoFe sub(2)O sub(4)/graphene composites were synthesized using a vapor diffusion method in combination with calcination. The morphologies and structures of the products were characterized by field emission scanning electron microscopy, X-ray diffractometer, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The magnetic and electromagnetic parameters were measured using a vibrating sample magnetometer and a vector network analyzer, respectively. Results show that rugby-shaped CoFe sub(2)O sub(4) particles are distributed on graphene sheets. A minimum reflection loss (RL) of -39.0 dB is observed at 10.9 GHz for the sample with a thickness of 2.0 mm, and the effective absorption frequency (RL < -10 dB) ranges from 9.6 to 14.3 GHz, indicating the excellent microwave absorption performance of the products. The absorbing performance of the CoFe sub(2)O sub(4) rugbies/graphene composites is better than that of the CoFe sub(2)O sub(4) nanoparticles/graphene composites.