文献类型：期刊文献

英文题名：A novel Fe3O4/carbon nanotube composite film with a cratered surface structure for effective microwave absorption

作者：Wu, Guang[1];He, Yu[1];Zhan, Hang[1];Shi, Qiang Qiang[1];Wang, Jian Nong[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2020

卷号：31

期号：14

起止页码：11508

外文期刊名：JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS

收录：;EI(收录号：20202408806328);WOS:【SCI-EXPANDED(收录号:WOS:000537648000003)】；

基金：This research was supported by National Key R&D Program of China (2018YFA0208404), National Natural Science Foundation of China (U1362104), and Innovation Program of Shanghai Municipal Education Commission.

语种：英文

外文关键词：Magnetite - Microwave devices - Stealth technology - Surface structure - Military applications - Carbon nanotubes - Acetone

摘要：With the rapid development of microwave technologies, electromagnetic pollution and stealth have become important problems to be solved. Carbon materials as a kind of lightweight and efficient microwave absorbing materials have been widely studied. However, it is still a great challenge to achieve strong and broadband absorption, especially at a thin thickness. Herein, an Fe3O4/carbon nanotube (CNT) composite film with a cratered surface structure is reported. This film is prepared by continuously shrinking and winding a cylindrical CNT assembly, and the cratered structure formed by inducing a reaction between the introduced ferric acetylacetone and the Al substrate of the film. While the pristine CNT film and the Fe3O4/CNT composite film with a smooth and flat surface show good microwave absorption only at large thicknesses (4 mm and above), the composite film with a cratered surface structure starts to show effective absorption over wide C and X radar bands at a thickness as small as 0.4 mm. Investigation of electromagnetic parameters suggests that the absorption may be due to the synergistic effects of dielectric and magnetic losses and internal multiple scattering. This study provides a cratered surface strategy for developing microwave absorbing materials with thin thickness, lightweight, and strong wideband absorption for applications in both civil and military fields.