Porous Fe@Fe 3 O 4 -C Nanocomposite Using Polyvinyl Alcohol Sponge as Template for Microwave Absorption
- PDF / 2,634,444 Bytes
- 9 Pages / 593.972 x 792 pts Page_size
- 100 Downloads / 234 Views
https://doi.org/10.1007/s11664-020-08443-w 2020 The Minerals, Metals & Materials Society
Porous Fe@Fe3O4-C Nanocomposite Using Polyvinyl Alcohol Sponge as Template for Microwave Absorption WENJIN ZHANG,1,2 ZIDONG ZHANG,1,2,5 YULIANG JIANG,1,2 CHUANXIN HOU,4,6 XUEYAN FU,1,2 HONGYAN DU,1,2 RUI TIAN,1,2 GUOJING ZHAO,1,2 SHENGMEI WEI,1,2 and RUNHUA FAN2,3,7 1.—School of Materials Science and Engineering, Shandong University, Jinan 250061, China. 2.—Key Laboratory for Liquid–Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, China. 3.—College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China. 4.—School of Environment and Material Engineering, Yantai University, Yantai 264005, China. 5.—e-mail: [email protected]. 6.—e-mail: [email protected]. 7.—e-mail: [email protected]
In order to obtain a material with excellent microwave absorption performance, polyvinyl alcohol (PVA) sponge was employed as the template. The porous structure of the sponge can facilitate faster and more uniform diffusion of the ferric nitrate liquid during the dipping and obtain a uniform distribution of the ferromagnetic particles, which serves as a functional phase to enhance the microwave absorption properties. The Fe@Fe3O4-C nanocomposite can then be fabricated through a dipping/carbonization process. The special core–shell structure effectively improves the dielectric and magnetic loss and provides proper impedance matching. The results indicate that the prepared samples show excellent microwave absorption performance, with maximum effective absorption bandwidth up to 7.9 GHz at a thickness of 2.27 mm. The maximum reflection loss can reach 48.36 dB at 9.6 GHz. Therefore, it is feasible to use PVA sponge as a template to fabricate porous Fe@Fe3O4-C nanocomposite with excellent microwave absorption performance. Key words: Microwave absorption, nanocomposite, polymer recycling, electromagnetic pollution
INTRODUCTION High-performance electromagnetic wave-absorbing materials have drawn widespread attention for their important applications, such as electroAchieving magnetic radiation protection.1–5 improved absorption performance usually requires high dielectric loss, high magnetic loss, and optimized impedance matching in materials. Therefore, various kinds of materials have been investigated, including metal oxides,6–8 ferromagnetic metals,8,9 and multicomponent composites,10,11. More importantly, it has been proved that a porous structure greatly improves microwave absorption properties,
(Received May 12, 2020; accepted August 20, 2020)
not only by enhancing the interfacial polarization, but also by introducing a multiple-reflection-loss mechanism.12–16 Chen et al.16 fabricated a porous graphene micro-flower composite with an effective absorption bandwidth (EAB) of 5.59 GHz and a maximum reflection loss (RL) of 42.59 dB. Hu et al.15 synthesized porous Fe2O3 nanorods with an EAB of 9.2 GHz and a maximum RL of 71.4 dB. These materials have g
Data Loading...
