Fe3O4/carbon chain-like core/shell composites: Synthesis and microwave absorption properties. Issue 190 (13th June 2018)

• Record Type: Journal Article
• Authors: Wang, Shipeng; Huang, Fei; Zhang, Min; Kong, Xiangkai; Zi, Zhenfa; Liu, Qiangchun
• Is Part Of: Integrated ferroelectrics. Issue 190(2018)
• Page Start: 76
• Page End: 84
• Publication Date: 2018-06-13
• Subjects: Fe3O4/carbon composite -- core/shell composites -- hydrothermal method -- microwave absorption; Ferroelectric devices -- Periodicals; Integrated circuits -- Periodicals; 537.244805
• DOI: 10.1080/10584587.2018.1456176
• Languages: English
• ISSNs: 1058-4587

Abstract

ABSTRACT: Fe3 O4 /carbon core/shell composites were fabricated via a two-step process. Fe3 O4 /phenol formaldehyde resin (PFR) core/shell composites were first obtained by hydrothermal method, and the Fe3 O4 /carbon core/shell composites were produced by annealing Fe3 O4 /PFR core/shell composites under nitrogen flow. The phase structures and morphologies of the composites had been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscope (TEM). The microwave absorption properties of the Fe3 O4 /carbon core/shell composites were measured by vector network analysis (VNA). When the ratio of Fe3 O4 and carbon is 1:2 and the sample thickness is 2.4 mm, the Fe3 O4 /carbon core/shell composites have an optimal absorption peak value of about −45.3 dB at 9.7 GHz and its effective absorption bandwidth lower than −10 dB reaches 2.3 GHz (from 7.8 to 11.1 GHz). The reflection loss results indicate that the Fe3 O4 /carbon core/shell composites possess higher microwave absorption. The excellent electromagnetic wave absorption properties of the Fe3 O4 /carbon core/shell composites were attributed to effective complementarities between the dielectric loss and the magnetic loss.